tag:blogger.com,1999:blog-22853915764295827362024-03-22T05:25:30.634-07:00Ron's Radio Corner PA2RF - Radio Frequency Adventures from Goeree-OverflakkeePA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.comBlogger299125tag:blogger.com,1999:blog-2285391576429582736.post-18770954307197600102024-03-19T10:37:00.000-07:002024-03-19T10:44:02.054-07:00Platform for KT0936M experiments<p><span style="font-family: arial;">The little KT0936M receiver IC has surprised me. To find out and explore the possibilties of this chip I made a simple platform.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgKgxBwrloZ0Q7wZ1do3lfeAQ8yK1Ck0-UigRo13uuXMCb9cA5Q-GZ1zAM-UYM1UM7YgZ4lyp1RfI9eHOeEk9Nj1uJ8rPEE668uNMwTpnvVSfcSVtcgIonmlzxRQwuU0o4Q7UIkZNG4JGPRzEUdwr4mxOOsoXa3qyBFVfWePRxg57PKFpiXNB7YOsEs-M/s4000/kt1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="359" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgKgxBwrloZ0Q7wZ1do3lfeAQ8yK1Ck0-UigRo13uuXMCb9cA5Q-GZ1zAM-UYM1UM7YgZ4lyp1RfI9eHOeEk9Nj1uJ8rPEE668uNMwTpnvVSfcSVtcgIonmlzxRQwuU0o4Q7UIkZNG4JGPRzEUdwr4mxOOsoXa3qyBFVfWePRxg57PKFpiXNB7YOsEs-M/w479-h359/kt1.jpg" width="479" /></a></div><p><br /></p><span style="font-family: arial;">A multiturn potentiometer enables me to select any of the more then 20 FM and SW bands. This KT0936M is a DSP chip and therefore frequency selection is very accurate. I listened to stable, small band, 14 MHz CW signals (in AM mode).</span><p></p><p><span style="font-family: arial;"><br /></span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOBpFbDQyM43OvzoYRWn2fkNrfsx6bBFYzUfPGwu59Nz7it7gSRT5xRMbrJbli_am-gpOiyC-lqKUb0tvdBNLPue31TzXuZGppE0r-WtGNqjZUvgEnGMpyP_wyNVeGmTPfXdvGxQjLtROCtJQSINoyqRZ6oIHaD9vyCpoauQbNc51m9f4_kUe4OS8wmb4/s4000/kt2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="483" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOBpFbDQyM43OvzoYRWn2fkNrfsx6bBFYzUfPGwu59Nz7it7gSRT5xRMbrJbli_am-gpOiyC-lqKUb0tvdBNLPue31TzXuZGppE0r-WtGNqjZUvgEnGMpyP_wyNVeGmTPfXdvGxQjLtROCtJQSINoyqRZ6oIHaD9vyCpoauQbNc51m9f4_kUe4OS8wmb4/w362-h483/kt2.jpg" width="362" /></a></div><div class="separator" style="clear: both; text-align: center;"><br /></div><p></p><p></p><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">Today I connected an LF amplifier with a TDA2050 IC. I was surprised by the quality of the sound.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">Anyway, I have to discover a lot.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">How can I display the exact receive frequency. There is no F<span style="font-size: xx-small;">out</span> pin. Also how can I receive Single Side Band signals. This chip does not have an IF since it it is a DSP chip. So, how can a BFO be added. At which operating frequency ?</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">Anyway (2), I am enjoying the reception of the broadcast AM stations from all over the world in the evening hours. The fading, the different languages, the memories..</span></div><p></p><p><br /><span style="font-family: arial;"><br /><br /></span></p><p><span style="font-family: arial;"><br /></span></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-86974442408990365262024-02-09T05:39:00.000-08:002024-02-11T09:23:08.339-08:00Little Medium Wave radio<p><span style="font-family: arial;">From a popular supplier of electronic goodies, I purchased a tiny MW/FM radio (not a DIY kit). It does not have a loudspeaker but should be used with headphones. I was interested in the performance of the MW part of the radio. </span></p><p><span style="font-family: arial;">And that really surprised me. It is a very sensitive receiver for the MW/AM band (530-1600 kHz) using a ferrite rod antenna. I thought nowadays the MW band should be almost 'dead'. But that is not the case. On this small radio I received a lot of broadcast stations past days.</span> </p><p class="MsoNormal"><br /></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiS02ALq8Up6a3ZIeW_QWn_ulkMzMJVzRKsjfbtDxO8EnSGrYEKymIbTRCH2jv7eheUR-gG6vWN7pSAFjDH0VK4QNr62pNTQ03kASPm4hsNB3AvAY1nBm9auO92sScqRC1JJJzlXyaVWKhzHnA9EebQQ4nLosG-yN88-kEIkHLIlVEBWswyWQ4hSCcu8Y0/s4000/MWradio.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="367" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiS02ALq8Up6a3ZIeW_QWn_ulkMzMJVzRKsjfbtDxO8EnSGrYEKymIbTRCH2jv7eheUR-gG6vWN7pSAFjDH0VK4QNr62pNTQ03kASPm4hsNB3AvAY1nBm9auO92sScqRC1JJJzlXyaVWKhzHnA9EebQQ4nLosG-yN88-kEIkHLIlVEBWswyWQ4hSCcu8Y0/w275-h367/MWradio.jpg" width="275" /></a></div><div class="separator" style="clear: both; text-align: justify;"><span style="font-family: arial; text-align: left;">I removed the battery case from the radio to find out what was the engine in this receiver. It turned out to be the IC KT0936M. After some research I found that the KT0936M is KT Micro's 3rd generation of integrated mono full band FM/MW/SW receiver chip supporting mechanical tuning with embedded MCU. The chip works with a supply voltage of 2.1V till 3.6V, so 2 AAA batteries can do the job. </span></div><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNBlwg0ZZapW-GzUV7qsL6xtEl0BTK1HZiUlgLg8fVUkRFeul33nQyf7O6jJHreb2Yv8Fb9W_T8Rx9QZ5-mYnjxu0penAWNTLFe5-55aH3Nxh9mtVuiIIlyuYrBdasfg5y4IXaiDeEiBcakKxozOX1K6sHxBAMUBulbKolhf25VZziLHmJ4nRxWnwyozo/s1500/KT0936M-block.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1000" data-original-width="1500" height="328" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNBlwg0ZZapW-GzUV7qsL6xtEl0BTK1HZiUlgLg8fVUkRFeul33nQyf7O6jJHreb2Yv8Fb9W_T8Rx9QZ5-mYnjxu0penAWNTLFe5-55aH3Nxh9mtVuiIIlyuYrBdasfg5y4IXaiDeEiBcakKxozOX1K6sHxBAMUBulbKolhf25VZziLHmJ4nRxWnwyozo/w494-h328/KT0936M-block.jpg" width="494" /></a></div><p class="MsoNormal"><span style="color: #222222; font-family: arial;">To my surprise the IC covers a wide range from 500 kHz - 110 MHz! The chip has been designed to facilitate following bands: </span></p><p class="MsoNormal"><span style="color: #222222; font-family: arial;"><br /></span></p>
<p class="MsoNormal"><span style="background-color: white; font-family: arial;"><span face=""Arial",sans-serif" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; color: #222222;">- Maximum two FM bands with configurable FM frequency range
within 32MHz-110MHz</span></span></p><p class="MsoNormal"><span style="background-color: white; font-family: arial;"><span face=""Arial",sans-serif" style="color: #222222;"><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial;"><span style="-webkit-text-stroke-width: 0px; float: none; font-variant-caps: normal; font-variant-ligatures: normal; orphans: 2; text-align: start; text-decoration-color: initial; text-decoration-style: initial; text-decoration-thickness: initial; widows: 2; word-spacing: 0px;">- Maximum two MW bands with configurable frequency
range within 500KHz -1750KHz</span></span><span style="mso-spacerun: yes;"> </span></span></span></p><p class="MsoNormal"><span style="background-color: white; color: #222222; font-family: arial;">-</span><span style="background: white; color: #222222; font-family: arial;">Up
to 14 SW bands with arbitrary frequency range within 1.75MHz – 32MHz</span></p>
<p class="MsoNormal"><span style="background-color: white; font-family: arial;"><span face=""Arial",sans-serif" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; color: #222222;"> </span></span></p><p class="MsoNormal"><span style="background-color: white; font-family: arial;"><span face=""Arial",sans-serif" style="color: #222222;"><br style="-webkit-text-stroke-width: 0px; box-sizing: border-box; font-variant-caps: normal; font-variant-ligatures: normal; orphans: 2; text-align: start; text-decoration-color: initial; text-decoration-style: initial; text-decoration-thickness: initial; widows: 2; word-spacing: 0px;" /></span></span><span style="font-family: arial;">The KT0936M has a high sensitivity, high signal-to-noise ratio and low distortion. </span></p>
<p class="MsoNormal"><span style="color: #222222; font-family: arial;">KT Micro provides following values for sensitivity:</span></p>
<p class="MsoNormal"><span style="background-color: white; font-family: arial;"><span face=""Arial",sans-serif" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; color: #222222;">1.6uV EMF for FM</span><span face=""Arial",sans-serif" style="color: #222222;"><br style="-webkit-text-stroke-width: 0px; box-sizing: border-box; font-variant-caps: normal; font-variant-ligatures: normal; orphans: 2; text-align: start; text-decoration-color: initial; text-decoration-style: initial; text-decoration-thickness: initial; widows: 2; word-spacing: 0px;" />
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial;"><span style="-webkit-text-stroke-width: 0px; float: none; font-variant-caps: normal; font-variant-ligatures: normal; orphans: 2; text-align: start; text-decoration-color: initial; text-decoration-style: initial; text-decoration-thickness: initial; widows: 2; word-spacing: 0px;">16uV EMF for MW</span></span><br style="-webkit-text-stroke-width: 0px; box-sizing: border-box; font-variant-caps: normal; font-variant-ligatures: normal; orphans: 2; text-align: start; text-decoration-color: initial; text-decoration-style: initial; text-decoration-thickness: initial; widows: 2; word-spacing: 0px;" />
<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial;"><span style="-webkit-text-stroke-width: 0px; float: none; font-variant-caps: normal; font-variant-ligatures: normal; orphans: 2; text-align: start; text-decoration-color: initial; text-decoration-style: initial; text-decoration-thickness: initial; widows: 2; word-spacing: 0px;">13uV EMF for SW</span><o:p></o:p></span></span></span></p>
<p class="MsoNormal"><span style="background-color: white; font-family: arial;"><span face=""Arial",sans-serif" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; color: #222222;"> </span><span face=""Arial",sans-serif" style="color: #222222;"><br style="-webkit-text-stroke-width: 0px; box-sizing: border-box; font-variant-caps: normal; font-variant-ligatures: normal; orphans: 2; text-align: start; text-decoration-color: initial; text-decoration-style: initial; text-decoration-thickness: initial; widows: 2; word-spacing: 0px;" /></span></span><span style="font-family: arial;">IC KT0936M provides direct and simple interface to support mechanical tuning. A pre-programmed low cost EEPROM can also be used to configure the radio band settings. No external MCU is required. </span></p><p class="MsoNormal"><span style="font-family: arial;">If you search on the internet for KT0936M designs, you can find out how the specific bands can be selected (use of resistor network). The IC should be useable for our radio amateur shortwave bands. At least a BFO has to be added to the design. . </span></p>
<br />PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-46557321643984531512024-01-18T00:22:00.000-08:002024-01-18T00:26:24.740-08:00Danish eQSL's<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIdMDbe-Ocgas_pqHXhFfd4x8hAKAL_0ACidLZUk1aGadOzxYh5QuRHJ7VOfIgYUq6GHO94Nq_jYKPajFXjJZZBXTGFBL88MPDtyRr65ilLQOFAZjghdgSQeMPh_5fHROzyfSi0v0I5XgNk_gh-IRxbrk8Y_ShI0KtvJaoWLB7lGzNmhlyJ_nzdkyaW-E/s529/king.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="337" data-original-width="529" height="242" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIdMDbe-Ocgas_pqHXhFfd4x8hAKAL_0ACidLZUk1aGadOzxYh5QuRHJ7VOfIgYUq6GHO94Nq_jYKPajFXjJZZBXTGFBL88MPDtyRr65ilLQOFAZjghdgSQeMPh_5fHROzyfSi0v0I5XgNk_gh-IRxbrk8Y_ShI0KtvJaoWLB7lGzNmhlyJ_nzdkyaW-E/w380-h242/king.jpg" width="380" /></a></div><br /><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhkcPueGm2N8jM97_Z4oPRAo5IpSoeSAQYch0kOgISC4YVWJ02-bptHCXit6qwpdDuUMXuP4D8232Sf8Rfx7VTzhkS6_HAp3IG9qMfMN4ZmIca2dLbkdVhL5wXSKu0Iph7yBb9vnW4iKC6Z0ACIRx8y47XVBtaSWvrw6zryHS7_pny8VSNnvSuZ2qkAuXg/s529/queen.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="337" data-original-width="529" height="245" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhkcPueGm2N8jM97_Z4oPRAo5IpSoeSAQYch0kOgISC4YVWJ02-bptHCXit6qwpdDuUMXuP4D8232Sf8Rfx7VTzhkS6_HAp3IG9qMfMN4ZmIca2dLbkdVhL5wXSKu0Iph7yBb9vnW4iKC6Z0ACIRx8y47XVBtaSWvrw6zryHS7_pny8VSNnvSuZ2qkAuXg/w384-h245/queen.jpg" width="384" /></a></div><br /><div><span style="font-family: arial;">Radiofriend Gerard, PA2G, made 2 FT-8 Special Event QSO's with Denmark. The event concerned the inauguration of King Frederik X. I think the eQSL's are quite special.</span></div>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-2047394352488921402023-11-30T23:23:00.000-08:002023-12-04T05:02:38.514-08:00Solar flare hitting Earth<p><span><span style="background-color: #fce5cd; font-family: arial;">A powerful M9.8-class solar flare erupted from the sun (AR3500) on Wednesday (Nov. 29) at 2:50 p.m. EST (1950 GMT), hurling a super-hot plasma eruption known as a coronal mass ejection (CME) toward Earth. The flare is expected to hit Earth today (Dec. 1, 2023).</span></span></p><p><span style="background-color: #fce5cd;"><span style="font-family: arial;"></span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDsXtHvHdxzoTRqBpVsi-_tesWLCBUoc6-cDQh-vM0_TpwN2kBElJoT75ktnBb5ywbFzfapfI8oZMUCtZ4ZVb_zIvpdWLC1txEYy8meHFoWuiNOMmMfWpNEIcKLsyesBXEFDGAkFcc4tosOLlD0KXfa6qGWnzDR4ar-4Zd1dQNimxq85c7Nd7HKX2SXI0/s800/nasasun.jpg" style="background-color: #fce5cd; margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="800" data-original-width="800" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDsXtHvHdxzoTRqBpVsi-_tesWLCBUoc6-cDQh-vM0_TpwN2kBElJoT75ktnBb5ywbFzfapfI8oZMUCtZ4ZVb_zIvpdWLC1txEYy8meHFoWuiNOMmMfWpNEIcKLsyesBXEFDGAkFcc4tosOLlD0KXfa6qGWnzDR4ar-4Zd1dQNimxq85c7Nd7HKX2SXI0/s320/nasasun.jpg" width="320" /></a></span></div><p></p><p><span><span style="background-color: #fce5cd; font-family: arial;">Hopefully our internet and radio communication systems can withstand the amount of electromagnetic energy that is brought in by this -almost X-class- solar flare</span></span></p><p><span><span style="background-color: #fce5cd; font-family: arial;">Note: I have not heard of any damage to communication systems whatsoever.</span></span></p><p><span><span style="background-color: #fce5cd; font-family: arial;"><br /></span></span></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-43835291719127875372023-10-30T02:42:00.005-07:002023-10-30T05:02:30.113-07:00DvdR 2023<p><span style="font-family: arial;">Last Saturday, Oct. 28, I was part of the ‘NL-post’ team at
the DvdR (Day of the Radio Amateur) in Zwolle, IJsselhallen. </span></p><p><span style="font-family: arial;">I was there with
Thieu, NL-199, PA0M and Gerard, PA2G. It was good to speak to fellow radio
enthousiastics and see lots of old and new radio stuff. It was remarkable that
my homebrewed BITX20 from 10 years ago - built in ‘Manhattan style’ - draw a lot of
attention.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIGwlufsG9a_hvSxPHM0B3j3WG1b1UaT2KhRuSXXXADpGujLdC_QpePc1vp7R-aPiOOxk6uSyqg4PrcxG9PUMSJhQdIuNAOC7y98aHNBt3mQlawy8f5v4NBOkUe3fHGtd4VW_taf8ILbyuANGNxBe2m8UuZyTretQihHZqabBnsWflvEwaVEbs_qulLaY/s4000/dvda1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="284" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIGwlufsG9a_hvSxPHM0B3j3WG1b1UaT2KhRuSXXXADpGujLdC_QpePc1vp7R-aPiOOxk6uSyqg4PrcxG9PUMSJhQdIuNAOC7y98aHNBt3mQlawy8f5v4NBOkUe3fHGtd4VW_taf8ILbyuANGNxBe2m8UuZyTretQihHZqabBnsWflvEwaVEbs_qulLaY/w378-h284/dvda1.jpg" width="378" /></a></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;">NL-Post stand with PA0M and PA2G</span></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVh5IJYemNw1j9DuVOIfgyy4WISbt4Lckp33PwTyBdxXLtPp1RkN0RhnB2KfPi1gqNncuMRBp_gYxjiMFMCbQEqPB7hjbhrq4vQWwNG8HY9MnRYROmkGKPZw6G-vP-kfz-Vdt9debnTN-mhKL3dZVcoRlXg_DcceSeOtz4fgH8im768W7N0yi-d3doNzk/s4000/dvda2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="274" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVh5IJYemNw1j9DuVOIfgyy4WISbt4Lckp33PwTyBdxXLtPp1RkN0RhnB2KfPi1gqNncuMRBp_gYxjiMFMCbQEqPB7hjbhrq4vQWwNG8HY9MnRYROmkGKPZw6G-vP-kfz-Vdt9debnTN-mhKL3dZVcoRlXg_DcceSeOtz4fgH8im768W7N0yi-d3doNzk/w366-h274/dvda2.jpg" width="366" /></a></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;">Scouting girls making worldwide radio contacts during CQWW SSB contest</span></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: center;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4idYSDzPKXB3zmqTEoETgZBR1YbiCUVx-nBkArY2prfDqR0h7Gu4Vw4dvM_Yaz5vGpUA1u6GDqqruAFvnkf6YoCIRqDW2MVa9B5f_0rOwaXsrnSjiuGHeQtXQTKrsDzdijtbEQGOiWbrGQMDVIPrs83HZjcCd6nXWlqe9wt5rqTLFrrdJFhVSpDRHeSk/s4000/dvda3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="362" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4idYSDzPKXB3zmqTEoETgZBR1YbiCUVx-nBkArY2prfDqR0h7Gu4Vw4dvM_Yaz5vGpUA1u6GDqqruAFvnkf6YoCIRqDW2MVa9B5f_0rOwaXsrnSjiuGHeQtXQTKrsDzdijtbEQGOiWbrGQMDVIPrs83HZjcCd6nXWlqe9wt5rqTLFrrdJFhVSpDRHeSk/w272-h362/dvda3.jpg" width="272" /></a></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;">Nice antenna designs</span></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmzXHTY0INkMTInNwMmgDPKavqEHi-0hr2ah0R2cGuNkclVXXNjKqjj81AdvZGA1KKDzUwbfL-c0IaKJC6yW_hSAM1FHbpIHCu435tcjrTyzsoSHjbGxHaFnFN2Y9PK8jh7_Pwog_GGK0ULyveJ8732tg9CaFWs_aNQjLordPv_lHRlfjuTvZqMX3EVZU/s4000/dvda4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="369" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmzXHTY0INkMTInNwMmgDPKavqEHi-0hr2ah0R2cGuNkclVXXNjKqjj81AdvZGA1KKDzUwbfL-c0IaKJC6yW_hSAM1FHbpIHCu435tcjrTyzsoSHjbGxHaFnFN2Y9PK8jh7_Pwog_GGK0ULyveJ8732tg9CaFWs_aNQjLordPv_lHRlfjuTvZqMX3EVZU/w277-h369/dvda4.jpg" width="277" /></a></div><span style="font-family: arial;">My BITX20 caught some attention</span><br /><div class="separator" style="clear: both; text-align: center;"><br /></div><br /><span style="font-family: arial;"><br /></span></div><br /><p class="MsoNormal"><o:p></o:p></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com1tag:blogger.com,1999:blog-2285391576429582736.post-54256203653712363202023-06-26T23:04:00.010-07:002023-11-06T01:22:53.299-08:00SDR receiver exploration<p><span style="font-family: arial;">Great fun with SDR Receiver MSI2500 in combination with SDRuno software. I am exploring the possibilities of this nice toy.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzfH0DP9hKDMajkOeBbWAmGQINMYgTCtvN0RDZMBJiPkji1-M_w4qMzqllNlh9Acc0Ma9JsxF1vC1PcXDSYvwO23SdM6qszE9Kuf6IHPDC0qbFB9EyceGRFqZhz3bbO2WC3l0uO7RFfNzPZadG2ApAvVK6WDyOeyh5R-jPx606VDf_9YFaCRkEY8JqE7U/s4000/SDR-MSI2500.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="419" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzfH0DP9hKDMajkOeBbWAmGQINMYgTCtvN0RDZMBJiPkji1-M_w4qMzqllNlh9Acc0Ma9JsxF1vC1PcXDSYvwO23SdM6qszE9Kuf6IHPDC0qbFB9EyceGRFqZhz3bbO2WC3l0uO7RFfNzPZadG2ApAvVK6WDyOeyh5R-jPx606VDf_9YFaCRkEY8JqE7U/w314-h419/SDR-MSI2500.jpg" width="314" /></a></div><p><span style="font-family: arial;">The SDR receiver (frequency range 30 - 1000 MHz) has 5 antenna inputs each with its own bandfilter</span></p><p></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhY2PZgdtvGu5FOX-BMJwOQb42xMumzjP2s5MmQM0nxzMVd_y01CeQwRkmpCo8sh56sG-K5LiWbmjIAXU6cwxwPF4CWMmBYchSeetQx9rHN57usb-h5HN8zzUk7h2f_LcbmmzNQmGeJGcpzvW8024wUNlloHjYSeXZs-E0Z5PUOnNORayUCDNQ0JWstMk4/s4000/SDRuno.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="314" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhY2PZgdtvGu5FOX-BMJwOQb42xMumzjP2s5MmQM0nxzMVd_y01CeQwRkmpCo8sh56sG-K5LiWbmjIAXU6cwxwPF4CWMmBYchSeetQx9rHN57usb-h5HN8zzUk7h2f_LcbmmzNQmGeJGcpzvW8024wUNlloHjYSeXZs-E0Z5PUOnNORayUCDNQ0JWstMk4/w419-h314/SDRuno.jpg" width="419" /></a></div><p><span style="font-family: arial;">SDRuno software in action ( Repeater PI2NOS, 430.125 MHz selected)</span></p><span style="font-family: arial;"><br /></span><p></p><p><span style="font-family: arial;">Experiment with E-field antenna for low frequency signals (< 10 MHz ).</span></p><p><span style="font-family: arial;"><br /></span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDs2TQDqLwmJeQhdaj-j8zoyXMi6LRXCGagV0SBvjHRulmAFmpNDE28wvjcit1blQgXqzXZxPpnjaGobOgAKHmorLzmDHaB62Afn4MyxdsZWyvm4B7i74LyqufG8NyVNtVu-TbVZUw7iILQBXT_ov6GYnJ7_U56nzn2dslGTe_tN_JfZjIBop4VY4eE4U/s4000/Efieldant.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="433" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDs2TQDqLwmJeQhdaj-j8zoyXMi6LRXCGagV0SBvjHRulmAFmpNDE28wvjcit1blQgXqzXZxPpnjaGobOgAKHmorLzmDHaB62Afn4MyxdsZWyvm4B7i74LyqufG8NyVNtVu-TbVZUw7iILQBXT_ov6GYnJ7_U56nzn2dslGTe_tN_JfZjIBop4VY4eE4U/w325-h433/Efieldant.jpg" width="325" /></a></div><br /><span style="font-family: arial;"><br /><br /></span><p></p><p><span style="font-family: arial;">I wrote an article for the Dutch radiomagazine Electron, NL-Post, Nov. 2023, about this SDR receiver:</span></p><p><span style="font-family: arial;"><br /></span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8ETIoV3auYlhI_FU32px9zInjeNAvhMbDjfNDJMDxjkQP-GoYZKpeEFnDTXBgSE6qUES_0Nm_yzg14M_-JIjEZw5ihBdOMHaFQ8Ip7XzO0eev6NJ_sTdDjX6t9Gq3Pm6epgQ1Pa3rc1ki_c7XI4lZeiMv6rfAXdKKeAtySDtfmEZIBcxV7lfWhfLpETQ/s4000/NL-post-nov23.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="535" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8ETIoV3auYlhI_FU32px9zInjeNAvhMbDjfNDJMDxjkQP-GoYZKpeEFnDTXBgSE6qUES_0Nm_yzg14M_-JIjEZw5ihBdOMHaFQ8Ip7XzO0eev6NJ_sTdDjX6t9Gq3Pm6epgQ1Pa3rc1ki_c7XI4lZeiMv6rfAXdKKeAtySDtfmEZIBcxV7lfWhfLpETQ/w402-h535/NL-post-nov23.jpg" width="402" /></a></div><br /><span style="font-family: arial;"><br /></span><p></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com5tag:blogger.com,1999:blog-2285391576429582736.post-14558200845314051732023-06-10T08:41:00.003-07:002023-06-12T01:44:25.759-07:00Sun<p><span style="font-family: arial;">Yesterday evening I witnessed the sunset from my backyard garden.</span></p><p><span style="font-family: arial;">I realized that it is amazing that a star at a distance of 150 million kilometers from us affects the propagation of radio signals on earth. During daytime the solar wind presses the Kennelly-Heaviside layer closer to the earth, thereby limiting how far it can reflect radio waves. The effect is also influenced by the amount of sunspot activity.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_O0nDaBjmMyhk553IGdQ16OmCCd1oEj_EqPw0yYI764-Z5TCvQ4vKSIucWQo3vaIHiFj9HMCtdGV19r3LC943BzhsQM2wiPvwemq4xPdYl3OXvBoa5jPiqpBbOkEby7enTtvyiFIYdrNq19bjd1tziAXpxMFnc7iYULO0lc2zOmYrxA3eKKqth-mA/s4000/sunsetron.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="488" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_O0nDaBjmMyhk553IGdQ16OmCCd1oEj_EqPw0yYI764-Z5TCvQ4vKSIucWQo3vaIHiFj9HMCtdGV19r3LC943BzhsQM2wiPvwemq4xPdYl3OXvBoa5jPiqpBbOkEby7enTtvyiFIYdrNq19bjd1tziAXpxMFnc7iYULO0lc2zOmYrxA3eKKqth-mA/w366-h488/sunsetron.jpg" width="366" /></a></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;">Sunset yesterday from Zuidzijde</span></div><br /><span style="font-family: arial;"><br /></span><p></p><p><span style="font-family: arial;"><br /></span></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-38155991029994929522023-06-06T01:26:00.003-07:002023-06-06T05:52:58.474-07:00HB9 on 160 m<p><span style="font-family: arial;">For a change, last week I was active on 160 m. With my end-fed longwire antenna - in the evening hours - I managed to work a couple of stations. One of them was HB9EFK. This was my first with Switzerland on 160 m.</span></p><p><span style="font-family: arial;"><br /></span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9HKVkqnob5Cl1WM_IdvHV1efSbSg8q_hykd-aMoQ6ZJ7ac2ifFutHmjf0XacornwncKn2VayO-0oxtSBUvzebw7Z9TW4N1YStAQPWJbEeLuHe_BFUDlfnEIoCdX2eUUncWLvPP2AFI_6Ls5tM3hU6bGDpZy6HSi0qEIKJxmt5fygo6nwGG_rCGEa6/s528/HB9EFK-qsl.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="336" data-original-width="528" height="258" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9HKVkqnob5Cl1WM_IdvHV1efSbSg8q_hykd-aMoQ6ZJ7ac2ifFutHmjf0XacornwncKn2VayO-0oxtSBUvzebw7Z9TW4N1YStAQPWJbEeLuHe_BFUDlfnEIoCdX2eUUncWLvPP2AFI_6Ls5tM3hU6bGDpZy6HSi0qEIKJxmt5fygo6nwGG_rCGEa6/w404-h258/HB9EFK-qsl.png" width="404" /></a></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;">Note: Description of the balun I use in combination with 25 mtrs of longwire </span></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><a href="https://pa2rf.blogspot.com/2019/01/balun-for-long-wire-antenna.html">https://pa2rf.blogspot.com/2019/01/balun-for-long-wire-antenna.html</a></span></div><div class="separator" style="clear: both; text-align: center;"><br /></div><br /><span style="font-family: arial;"><br /></span><p></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com2tag:blogger.com,1999:blog-2285391576429582736.post-63051346033430892832023-05-08T01:39:00.010-07:002023-08-07T06:58:57.686-07:00Start of the Es season<p><span style="font-family: arial;">Yesterday I powered up my 4 m equipment. To my surprise I saw EA and 9H stations. No dx QSO's yet. I did make some local 70 MHz QSO's though. Looks like the E<span style="font-size: x-small;">s</span> season is ready to start.</span></p><p><span style="font-family: arial;"><br /></span></p><p><span style="font-family: arial;"></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSNTJsAXQxyqUc1Ia7npec3aMVcNkPy5-sskxmvQUqtQQNvi9oPtCmfvysfhMQYrUcmkcU7EmrMzPvtuXYTQbiXLGD7ALToaY0SkvoaV84U16iMo_GeT17zAeh02MYlKBmDrHFdOKJwxKuU8rqkNm0J6-Af9UK3F_7ovxBBCx1WrxfCRsiDJuy16Zs/s528/PA2J-QSL.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="336" data-original-width="528" height="242" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSNTJsAXQxyqUc1Ia7npec3aMVcNkPy5-sskxmvQUqtQQNvi9oPtCmfvysfhMQYrUcmkcU7EmrMzPvtuXYTQbiXLGD7ALToaY0SkvoaV84U16iMo_GeT17zAeh02MYlKBmDrHFdOKJwxKuU8rqkNm0J6-Af9UK3F_7ovxBBCx1WrxfCRsiDJuy16Zs/w379-h242/PA2J-QSL.jpg" width="379" /></a></span></div><span style="font-family: arial;"><br /> <div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2Zm3fP3f5AaJAmsba6WXzXnohu9eMC-TtzWSiI3wDCaOwLB-nN0FVZwYHZCuBVRn8-_Xo9ekP0KOU0CT9tKjeDu07ZWIMcLYisD_nAcfWe-baB5UYP5W2h50lOzh1BpzNan7EbvEFPxtad-S-cmcSNvplH8R0mRKga-Hc_TuIw6bYlJU_lX-ULflw/s528/_cfimg-7555905211772089644.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="336" data-original-width="528" height="231" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2Zm3fP3f5AaJAmsba6WXzXnohu9eMC-TtzWSiI3wDCaOwLB-nN0FVZwYHZCuBVRn8-_Xo9ekP0KOU0CT9tKjeDu07ZWIMcLYisD_nAcfWe-baB5UYP5W2h50lOzh1BpzNan7EbvEFPxtad-S-cmcSNvplH8R0mRKga-Hc_TuIw6bYlJU_lX-ULflw/w363-h231/_cfimg-7555905211772089644.png" width="363" /></a></div><br /></span><p></p><div><span style="font-family: arial;">70MHz stations that heard my 15 Watt signal 9 July 2023. With some of them I had a FT8 QSO;</span></div><div><span style="font-family: arial;"><br /></span></div><div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgT49tQh0VxRPaWXU12MkgqsW6DxWt4U9Bwdp8GBpAMgD64SItPFp0S-jJtCaJAUtRawABHIQOb3PhbSUWlFz3fW64Y3oMTTyYsrflfbPerUn6ZqMjJzorZSpOM0qrueSXeB78s-oTggARTeAaqrnkkfqf_dRQi4MC-h1yABZd6LPnQ8DLrX5zcELO3b4/s858/4mes.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="688" data-original-width="858" height="285" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgT49tQh0VxRPaWXU12MkgqsW6DxWt4U9Bwdp8GBpAMgD64SItPFp0S-jJtCaJAUtRawABHIQOb3PhbSUWlFz3fW64Y3oMTTyYsrflfbPerUn6ZqMjJzorZSpOM0qrueSXeB78s-oTggARTeAaqrnkkfqf_dRQi4MC-h1yABZd6LPnQ8DLrX5zcELO3b4/w355-h285/4mes.jpg" width="355" /></a></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;">First with OK;</span></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: center;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgARd-zcjTz0Eftev3XXhTxl2i3R47MdhGgPV5zIJpmwPT5p4fFPg5tee4srYtimiCkbb07lHiVqdKHRpdg0P1msNpKQNviKVgUWKa_mo8uc-GvTPxHZ8YGuOxzeZt4uplilF0O2wSGUgfvlOYtvvaCERwhF2l_MYXDJZFxRi31vaM4FF8cWdCHI8-TuBI/s528/ok2wo-4m.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="336" data-original-width="528" height="216" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgARd-zcjTz0Eftev3XXhTxl2i3R47MdhGgPV5zIJpmwPT5p4fFPg5tee4srYtimiCkbb07lHiVqdKHRpdg0P1msNpKQNviKVgUWKa_mo8uc-GvTPxHZ8YGuOxzeZt4uplilF0O2wSGUgfvlOYtvvaCERwhF2l_MYXDJZFxRi31vaM4FF8cWdCHI8-TuBI/w339-h216/ok2wo-4m.png" width="339" /></a></div><br /><span style="font-family: arial;"><br /></span></div><br /><span style="font-family: arial;"><br /></span></div>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com2tag:blogger.com,1999:blog-2285391576429582736.post-74298204020171365672023-04-17T02:56:00.010-07:002023-10-02T02:21:05.475-07:00The Stele of Hatiay<p><span face="Arial, sans-serif">Lately I visited the </span><span face="Arial, sans-serif">National Museum of Antiquities (‘Rijksmuseum
van Oudheden’) in Leiden. One of the many fascinating objects that amazed me
was ‘The Stele of Hatiay’. It shows general Hatiay announcing – in name of his
king - that he has established many new sacred memorials (1330-1320 BC). That’s
what the text near the stele tells us.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiporwfxqIQZMoj56N-8acIz2K_gUXQUpQh14lHeYJhqcCbfzQ9TP1dnkOFtBwivBni6HsDWrt79gyaSQE0b0pHVHXiO-Ou3HGP3QNLBTVuNxWaMuJht0Lf1MXijF78kXKZqlPfSHdRRpiWqZguAmKXPJbJRG4Cbk4ZNirT3WWNPbU23I_OdbASWpSL/s4000/Stel0.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="372" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiporwfxqIQZMoj56N-8acIz2K_gUXQUpQh14lHeYJhqcCbfzQ9TP1dnkOFtBwivBni6HsDWrt79gyaSQE0b0pHVHXiO-Ou3HGP3QNLBTVuNxWaMuJht0Lf1MXijF78kXKZqlPfSHdRRpiWqZguAmKXPJbJRG4Cbk4ZNirT3WWNPbU23I_OdbASWpSL/w279-h372/Stel0.jpg" width="279" /></a></div><br /><span face="Arial, sans-serif"><br /></span><p></p>
<p class="MsoNormal"><span face=""Arial",sans-serif">I was intrigued
by the triangular shaped device that Hatiay holds in his hand. If you have a
close look at the smaller persons, some of them also hold similar devices. In
my view the triangular shaped units look like microphones. With a little bit of
phantasy we see here something that looks like an early version of an internet
teams meeting… Maybe the microphones operate wireless since there is a small
piece of (antenna) wire coming from the triangles… <o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1AvDctWq9uDYQ0Nl_hQiaQqiCzxjVvLlOI_5nKodEOVOoyd7nmgGmexO_qotZx6o50fK_A352L2vjMZyXiLK9W-17HOeb0H65o505aF6CJyqKMrg4m-lWTP3Gp0tPBKs1TJe1fAD0E6Xv9zCDcJ2uNTy9J7As8Iya5PYlQdwf6sJZdJHfrvGqvVFq/s2048/Stele2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1365" height="376" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1AvDctWq9uDYQ0Nl_hQiaQqiCzxjVvLlOI_5nKodEOVOoyd7nmgGmexO_qotZx6o50fK_A352L2vjMZyXiLK9W-17HOeb0H65o505aF6CJyqKMrg4m-lWTP3Gp0tPBKs1TJe1fAD0E6Xv9zCDcJ2uNTy9J7As8Iya5PYlQdwf6sJZdJHfrvGqvVFq/w250-h376/Stele2.jpg" width="250" /></a></div><br /><span face=""Arial",sans-serif"><br /></span><p></p>
<p class="MsoNormal"><span face=""Arial",sans-serif">More
interesting information on ancient technology:<o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://en.wikipedia.org/wiki/Zecharia_Sitchin"><span face=""Arial",sans-serif">https://en.wikipedia.org/wiki/Zecharia_Sitchin</span></a><span face=""Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://en.wikipedia.org/wiki/Erich_von_D%C3%A4niken"><span face=""Arial",sans-serif">https://en.wikipedia.org/wiki/Erich_von_D%C3%A4niken</span></a><span face=""Arial",sans-serif"><o:p></o:p></span></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com3tag:blogger.com,1999:blog-2285391576429582736.post-72580761177370283292023-04-07T05:19:00.004-07:002023-04-07T05:54:12.934-07:00BC860XLT VHF/UHF scanner<p><span style="font-family: arial;">Last weekend I re-discovered the Uniden Bearcat BC860XLT
VHF/UHF scanner. I did not use it for over 10 years. It is a remarkable
receiver covering the frequency range 29 – 956 MHz. It contains 100 channels to
store favorite frequencies.</span></p>
<p class="MsoNormal" style="line-height: normal; margin-bottom: 0in;"><span style="font-family: arial;"></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikmzwaQta7dz07ijYVMjab1gD1DgVh4AIyGcCanDWxTftktyP5pgmq7bt241R6ido7tEI-ToN0tVGayCvBygHkb_V6p0m0SNqjZJcrwYLwZ9xoCCVGzQ22qiGnyIP2mrJYY7vCL5TvcKLgHb1xTzAZjEf4KLTZhyJk4eNFzzVGnKU_LPDCBAntheQj/s400/scanner100channel.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="300" data-original-width="400" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikmzwaQta7dz07ijYVMjab1gD1DgVh4AIyGcCanDWxTftktyP5pgmq7bt241R6ido7tEI-ToN0tVGayCvBygHkb_V6p0m0SNqjZJcrwYLwZ9xoCCVGzQ22qiGnyIP2mrJYY7vCL5TvcKLgHb1xTzAZjEf4KLTZhyJk4eNFzzVGnKU_LPDCBAntheQj/s320/scanner100channel.jpg" width="320" /></a></span></div><span style="font-family: arial;"><br /><span style="color: black; font-size: 10pt;"><br style="mso-special-character: line-break;" />
<!--[if !supportLineBreakNewLine]--><br style="mso-special-character: line-break;" />
<!--[endif]--></span><o:p></o:p></span><p></p>
<p class="MsoNormal"><span style="font-family: arial;">I was glad to find out that the device still works fine.
Receiving aircraft AM voice transmissions from Rotterdam Airport and vessel voice communications from the Northsea confirm that
the unit is in good shape. Nice toy !<o:p></o:p></span></p>
<p class="MsoNormal"><o:p><span style="font-family: arial;"> </span></o:p></p>
<p class="MsoNormal"><span style="font-family: arial;">Specs:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: arial;"><a href="https://www.rigpix.com/bearcat/ubc860xlt.htm">https://www.rigpix.com/bearcat/ubc860xlt.htm</a></span><o:p></o:p></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-77635434303017876322023-03-10T04:45:00.005-08:002023-04-07T06:17:21.980-07:00Citizen Band QSL card<p><span style="font-family: arial;">Just found one of my old CB QSL cards. This one is from 1978. At the time I used a 23 channel CB transceiver "North Star". Memories..channel 14, 27.125 MHz AM .. and 4 Watt RF output into a DV27 mobile antenna.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjW3C5UNw7SzwklwCZ5S_FY6qpR482nbx5-DFwVuaI1zkL8iZmOfn-nWlr8ywRheasxhcwIXIekb_9NznRouCPTGyrxPeWfyrFDobnmh2zDGmaqdICudSCOfDj6G_Fj_f5XsW-hJ-KJL2OAC5qGThVWAtvJZ_p556KxV0A0bjF8KmyYlahUX9r3lGJU/s461/northstar23ch.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="282" data-original-width="461" height="218" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjW3C5UNw7SzwklwCZ5S_FY6qpR482nbx5-DFwVuaI1zkL8iZmOfn-nWlr8ywRheasxhcwIXIekb_9NznRouCPTGyrxPeWfyrFDobnmh2zDGmaqdICudSCOfDj6G_Fj_f5XsW-hJ-KJL2OAC5qGThVWAtvJZ_p556KxV0A0bjF8KmyYlahUX9r3lGJU/w356-h218/northstar23ch.jpg" width="356" /></a></div><br /><span style="font-family: arial;"><br /></span><p></p><p><span style="font-family: arial;">How did your QSL card look like ?</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqjRI6Q9RpmKyMf5THJrUDVV2zcHTozAuavNaNlWOXvsDShbeshucmC1KI6f9YUj1AV2JQjlqj20HAhh37qSrbvuwmlkx3yl2u-TxYL0RjVSeYiMXOcbaChvH4pFVLC8gdbijzC3siugpuD_WuT9zY-p8uQ1scapo6Ea3qeZPl8KG7FG72M66sXQy_/s2048/Titan2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1152" data-original-width="2048" height="238" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqjRI6Q9RpmKyMf5THJrUDVV2zcHTozAuavNaNlWOXvsDShbeshucmC1KI6f9YUj1AV2JQjlqj20HAhh37qSrbvuwmlkx3yl2u-TxYL0RjVSeYiMXOcbaChvH4pFVLC8gdbijzC3siugpuD_WuT9zY-p8uQ1scapo6Ea3qeZPl8KG7FG72M66sXQy_/w423-h238/Titan2.jpg" width="423" /></a></div><br /><span style="font-family: arial;"><br /></span><p></p><p><span style="font-family: arial;"><br /></span></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com7tag:blogger.com,1999:blog-2285391576429582736.post-49369790545122459202022-12-16T05:01:00.008-08:002022-12-19T05:17:41.459-08:00Logaritmic Power Detector<p><span style="font-family: arial;">From AliExpress I ordered this nice PCB with a logaritmic power detector circuit onboard. The electronics is designed around an AD8307 integrated circuit. The detector should operate in the range 1 - 600 MHz. DC input anywhere between 6 .. 15 Volts. </span></p><p><span style="font-family: arial;">All ingredients are there to realize a nice S-meter / RF Pwr-meter. </span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiGv9Th4nDzIRk1Ewe011Fs5wIt_wiwKT-cNW62RnEzjPXXM-KsIlsOTkW46OTVaL-43hjTF0oUgxlM6ViLjSNDZQWlSU4_OlUtzDVF-8eCdlTuaFSICl4KJg1h22bpQLuQ2Db4OBVg-U3uuUXtQbYRtW2pX8NKamrns6-9-O1lL8GXEkL0-ppOtHnn/s960/Logpwrdect2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="960" data-original-width="960" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiGv9Th4nDzIRk1Ewe011Fs5wIt_wiwKT-cNW62RnEzjPXXM-KsIlsOTkW46OTVaL-43hjTF0oUgxlM6ViLjSNDZQWlSU4_OlUtzDVF-8eCdlTuaFSICl4KJg1h22bpQLuQ2Db4OBVg-U3uuUXtQbYRtW2pX8NKamrns6-9-O1lL8GXEkL0-ppOtHnn/s320/Logpwrdect2.jpg" width="320" /></a></div><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkfxouFOZHe5hlIW2RgUGDUa0msGUWH2GlFG0RVqd9X9yneNYPor3JNFTZ_N_d0_0JtWSTA6v9vbU7CxoikBQPfhvDoVg-UJMXYNWH3cZyhnAhrP1Cn7hSVRKfLY85Cv5XfDTGzmRowRYP5t9y7g1FriOMejJntksOlPEPzC4_8gXcJklheNzdWW34/s4000/Logdetector.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkfxouFOZHe5hlIW2RgUGDUa0msGUWH2GlFG0RVqd9X9yneNYPor3JNFTZ_N_d0_0JtWSTA6v9vbU7CxoikBQPfhvDoVg-UJMXYNWH3cZyhnAhrP1Cn7hSVRKfLY85Cv5XfDTGzmRowRYP5t9y7g1FriOMejJntksOlPEPzC4_8gXcJklheNzdWW34/s320/Logdetector.jpg" width="240" /></a></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPvwJ1zX5yxklWi0saAHaq60BlOYebo7otIAkB2W-9uODl5mPh_XHR7aG17HEwodWen43Z4P5XbGoAXcZu6ZMw5wl_XS0gpvcTBOx5aKPCVEc3uTJFn5wjSkZ1zg1ZlWlfP7x8TF0P9f2pP46WA8Z-tQ3JTyP3gtNjH_ISTEjmHNLXXdlOla6zXNnE/s415/AD8307-fbl.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="270" data-original-width="415" height="231" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPvwJ1zX5yxklWi0saAHaq60BlOYebo7otIAkB2W-9uODl5mPh_XHR7aG17HEwodWen43Z4P5XbGoAXcZu6ZMw5wl_XS0gpvcTBOx5aKPCVEc3uTJFn5wjSkZ1zg1ZlWlfP7x8TF0P9f2pP46WA8Z-tQ3JTyP3gtNjH_ISTEjmHNLXXdlOla6zXNnE/w355-h231/AD8307-fbl.png" width="355" /></a></div><br /><div class="separator" style="clear: both; text-align: center;"><br /></div><br /><span style="font-family: arial;"><br /></span><p></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com3tag:blogger.com,1999:blog-2285391576429582736.post-46859574173941196502022-09-02T01:54:00.008-07:002022-09-02T02:02:21.636-07:00HF65<p><span face=""Arial",sans-serif">JostyKit was
the name of a Danish manufacturer that sold nice Do-It-Yourself kits. One of
them was the HF65. In fact a free running oscillator that operated in the FM
broadcast band (and below and above </span><span style="font-family: Wingdings; mso-ascii-font-family: Arial; mso-bidi-font-family: Arial; mso-char-type: symbol; mso-hansi-font-family: Arial; mso-symbol-font-family: Wingdings;"><span style="mso-char-type: symbol; mso-symbol-font-family: Wingdings;">J</span></span><span face=""Arial",sans-serif">, according to the specification sheet
somewhere between 60 -145 MHz). A 2N2219 transistor provided appr. 1 Watt HF. The
modulation was a mix of FM and AM, but on a regular FM tuner one could easily
hear the HF65 and the sound quality wasn’t even bad.</span></p>
<p class="MsoNormal"><span face=""Arial",sans-serif">Anyway around
1977 I played with this nice device and was able to broadcast some music in the
neighbourhood. <o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilcR52j1sS9PyfeEBLx889GMGFut0xynmV3TE98VJe-2BhSQ8p8ZBNpU6FSw7qhiBxgbYLVxpCbIfOFEGCx7tcR7uZTaJEyUNZzIBJZ4O-CBrj5z9MLtUWy1uZBW21tE3I1-HkucyHDD71V7m-nouDNJwsIJrlEjG3mbTPaMa8bzsmpgRlU9gz5m6-/s500/hf65-view.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="500" data-original-width="485" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilcR52j1sS9PyfeEBLx889GMGFut0xynmV3TE98VJe-2BhSQ8p8ZBNpU6FSw7qhiBxgbYLVxpCbIfOFEGCx7tcR7uZTaJEyUNZzIBJZ4O-CBrj5z9MLtUWy1uZBW21tE3I1-HkucyHDD71V7m-nouDNJwsIJrlEjG3mbTPaMa8bzsmpgRlU9gz5m6-/s320/hf65-view.jpg" width="310" /></a></div><br /><span face=""Arial",sans-serif"><br /></span><p></p><p class="MsoNormal">I think many
liscenced HAM operators nowadays started their radio experience with
transmitters similar to the HF65.</p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0KMGLeXI_9dFAp3Xzs__yCNiwOYklakisNnjKi8jmIbmM7U9MuIEpeidFEErVwkDGrD3ueTNmn_8KrZRkFpDEiY32HmzK2--NqvY4j7JBebWFz8c-K8DvPprF2YhyMmyc2VOqj1M6-86sI9I_CaMYK38-fuh0iLYp-OWqFyTaOj9y65gfOylLe5aT/s299/hf65schema.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="168" data-original-width="299" height="217" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0KMGLeXI_9dFAp3Xzs__yCNiwOYklakisNnjKi8jmIbmM7U9MuIEpeidFEErVwkDGrD3ueTNmn_8KrZRkFpDEiY32HmzK2--NqvY4j7JBebWFz8c-K8DvPprF2YhyMmyc2VOqj1M6-86sI9I_CaMYK38-fuh0iLYp-OWqFyTaOj9y65gfOylLe5aT/w386-h217/hf65schema.jpg" width="386" /></a></div><br /><p class="MsoNormal"><span face=""Arial",sans-serif">T1 = 2N2219</span></p><p class="MsoNormal"><span face=""Arial",sans-serif">T2 = BC172</span></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com11tag:blogger.com,1999:blog-2285391576429582736.post-65707970637730186452022-04-12T02:30:00.009-07:002022-04-13T05:22:32.048-07:008 meter band<p><span style="font-family: arial;">Lately there is quite a lot of attention for the 8 m band
(40 MHz). Transmissions are done from Ireland, UK </span><span style="font-family: arial;"> </span><span style="font-family: arial;">and Denmark for example.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioskBzcADDZeP3IKNtq4g5a7EYpM25hiPGpHAbKqkEoZ91_NQDGhFyaEM2wCPwQNws_bxzgbseANeYHrgC44IBBY5-X7yjYFXCYdQZAHHQiM43AM1j5PnVaUybXA6-XT1DJ9jO83jkIsTQAWOO8x5Vn3jpNYULJMCmOZVkEldk0L8yPEUpqbnhgR8b/s4000/20220413_101307.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioskBzcADDZeP3IKNtq4g5a7EYpM25hiPGpHAbKqkEoZ91_NQDGhFyaEM2wCPwQNws_bxzgbseANeYHrgC44IBBY5-X7yjYFXCYdQZAHHQiM43AM1j5PnVaUybXA6-XT1DJ9jO83jkIsTQAWOO8x5Vn3jpNYULJMCmOZVkEldk0L8yPEUpqbnhgR8b/s320/20220413_101307.jpg" width="320" /></a></div><br /><span style="font-family: arial;"><br /></span><p></p>
<p class="MsoNormal"><span style="font-family: arial;">This band could be interesting to explore for various
reasons:</span></p><p class="MsoNormal"><span style="font-family: arial;">The 8-meter band shares many characteristics with the neighboring 6-meter band. However, as it
is somewhat lower in frequency it does display the better propagation mechanisms
via the F2 layer normally seen at HF. Also sporadic
E-propagation is common on this band in summer.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: arial;">After I performed the MARS modification, my FT-450 is able
to receive 40 MHz signals. Of course the FT-450 input filters are not designed
for this frequencies.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: arial;">I am working on a 8 m bandpass filter / pre-amplifier for
the FT-450 to increase the sensitivity for this band. </span></p><p class="MsoNormal"><span style="font-family: arial;">Hopefully I will be able to tune in into 40.680 MHz - to receive FT-8 signals - soon.</span></p>
<p class="MsoNormal"><span style="font-family: arial;">First results;</span><o:p></o:p></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgt6p4NT3uFaZALPnkxZwtGjEABa_t4FecifRDNVEcMTh32V8RVWw_Tcw0Ai2f8OHk3-vT2wG86Vcy0wZmWid5ziMFdV1fBwPVjH4IQEIHAGdlT7HIAAFd1wWoEhGkBEVPPnOoKYw-5SMRed06mdZp9iZCvIB36r5tXWzRA6yAGUAG6UGe8iVS39dES/s4000/4mfilter2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="302" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgt6p4NT3uFaZALPnkxZwtGjEABa_t4FecifRDNVEcMTh32V8RVWw_Tcw0Ai2f8OHk3-vT2wG86Vcy0wZmWid5ziMFdV1fBwPVjH4IQEIHAGdlT7HIAAFd1wWoEhGkBEVPPnOoKYw-5SMRed06mdZp9iZCvIB36r5tXWzRA6yAGUAG6UGe8iVS39dES/w403-h302/4mfilter2.jpg" width="403" /></a></div> <span style="font-family: arial;"> Passive band filter under test</span><br /><span style="font-family: arial;"><br /></span><p></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRbKI3ZCZEjG3ng_uYQOvgyiJWHRTACXF8ZeEMKHna-vEtlp_lLfbzGin7ESj2cQP3J3Kg2GeBwAbPKsyxd50xWUSzHT7CpI7y2XLPyQ-4BbVnPQlSo_R5oJGNThx_OL1N-k-lhxhcPsg5Zk5UAoKXHogfSvrvM-CLQEQtbUiEFi4yHFt5CCK9NrIX/s4000/4mfilter.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="281" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRbKI3ZCZEjG3ng_uYQOvgyiJWHRTACXF8ZeEMKHna-vEtlp_lLfbzGin7ESj2cQP3J3Kg2GeBwAbPKsyxd50xWUSzHT7CpI7y2XLPyQ-4BbVnPQlSo_R5oJGNThx_OL1N-k-lhxhcPsg5Zk5UAoKXHogfSvrvM-CLQEQtbUiEFi4yHFt5CCK9NrIX/w375-h281/4mfilter.jpg" width="375" /></a></div> <span style="font-family: arial;"> </span><span style="font-family: arial;">nanoVNA showing filter characteristic</span><br /><span style="font-family: arial;"><br /></span><p></p><p class="MsoNormal"><span style="font-family: arial;"><br /></span></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-43513686759674949072022-04-02T03:27:00.009-07:002022-04-09T08:44:31.359-07:00Hardware<p> <span style="font-family: arial;">For more than 10 years I have a piece of hardware in my junkbox that waits for an application:</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYbZtVYGygrbtvVVIJpUYXWxmjB0nJF1jkKbTWJQp7hoUF0x3OtywC5_k7ldIutPTNNwrolhc4QlgjYzL1CB9lNdpH1_FROE6RM-vnS1tEML8rn4WuOF3-8r5c62mSl_1UrFFvcfP_T27aEgeAaVmGCLKPTawP1L4mlBbYNYjUyt6VwjOSV_o9CaJq/s4000/mechsem1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="313" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYbZtVYGygrbtvVVIJpUYXWxmjB0nJF1jkKbTWJQp7hoUF0x3OtywC5_k7ldIutPTNNwrolhc4QlgjYzL1CB9lNdpH1_FROE6RM-vnS1tEML8rn4WuOF3-8r5c62mSl_1UrFFvcfP_T27aEgeAaVmGCLKPTawP1L4mlBbYNYjUyt6VwjOSV_o9CaJq/w417-h313/mechsem1.jpg" width="417" /></a></div><p><span style="font-family: arial;">It is an old school mechanical tuning device, most likely obtained from 'green' radio equipment. The tuning knob drives, tru a variety of gear wheels, a 100 Kohm potentiometer.</span></p><p><span style="font-family: arial;">The only (German) inscription present says "Funk.stat.18.T"</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisGjT7kJGM_zD5NqSeAxwgFgXD2XTL3R6rfPfKfuty7vTk7c8AfdmngecZIlhgZburuavfqp425IjK4iSNc5SaweLcdbNp4VTGJIjC48uG9uXcBO0w-CSyD6qfZ4h_fN5lcGPqzaUc_tLywxJaaQ21-XlUrH_lvsCquyD9boZaITbaogHP_QeQLciV/s4000/mechsem2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="295" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisGjT7kJGM_zD5NqSeAxwgFgXD2XTL3R6rfPfKfuty7vTk7c8AfdmngecZIlhgZburuavfqp425IjK4iSNc5SaweLcdbNp4VTGJIjC48uG9uXcBO0w-CSyD6qfZ4h_fN5lcGPqzaUc_tLywxJaaQ21-XlUrH_lvsCquyD9boZaITbaogHP_QeQLciV/w393-h295/mechsem2.jpg" width="393" /></a></div><p><br /></p><span style="font-family: arial;">This beautiful piece of mechanical art waits to be incorporated into a homebrew VFO (for example).</span><br /><span style="font-family: arial;"><br /></span><p></p><span style="font-family: arial;">Off topic:</span><div><span style="font-family: arial;"><br /></span></div><div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgW_6bm5c950PakVoekeKdLODSLfdF96hIQBPCif_Cjhc8gjo3XPHQ3hkomTpJ7-GK-GXVDut0fCl_B_RwuoxQRZQ0L6Kx9SAMyzs9ysXoXu4ba7f-WvEZWOdCc-jSGKpCiwXt2ggH3vKhxR1yjdzm5OGkqRNqJcG7Z6Z8sqhJ3ylpSJqJuSEiX_fXt/s2048/zuidzijdebyair.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="2048" height="362" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgW_6bm5c950PakVoekeKdLODSLfdF96hIQBPCif_Cjhc8gjo3XPHQ3hkomTpJ7-GK-GXVDut0fCl_B_RwuoxQRZQ0L6Kx9SAMyzs9ysXoXu4ba7f-WvEZWOdCc-jSGKpCiwXt2ggH3vKhxR1yjdzm5OGkqRNqJcG7Z6Z8sqhJ3ylpSJqJuSEiX_fXt/w362-h362/zuidzijdebyair.jpg" width="362" /></a></div><div><br /></div><span style="font-family: arial;">My QTH Zuidzijde,</span><span style="font-family: arial;"> locator JO21dq from above. Photographed by a collegue in a Robin DR400, March 2022</span></div><div><span style="font-family: arial;"><br /></span><div><span style="font-family: arial;"><br /></span></div><div><span style="font-family: arial;"><br /></span><span style="font-family: arial;"><br /></span><p></p></div></div>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-8158587308365725532022-02-02T05:25:00.016-08:002022-11-18T04:28:37.218-08:00Earth's thermal radiation<p><span style="font-family: arial;">As a radio amateur I am interested in all sorts of electromagnetic radiation. That includes thermal radiation in the infrared spectrum as well. Lately prof. William Harper visited The Netherlands with a remarkable presentation on climate. I was intrigued by one of his graphs:</span></p><p><span style="font-family: arial;"><br /></span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEiCLp1kVPAYTls8XmO_oabuji04wBjVPJRdfgz_-EZYEv-aTcpP22b3EzUu3NuzKRIcKohNQbUsdIQjmF3Io87y7LRB5FXMQRood4pTNNwZtfHWO9QqIlkGifNpQrqImEbCw23jZcaxVjiGIlf7e1rbndQhJYCumyXns8HkzTE0A2r2DsSeNkagqyWs=s1032" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="514" data-original-width="1032" height="245" src="https://blogger.googleusercontent.com/img/a/AVvXsEiCLp1kVPAYTls8XmO_oabuji04wBjVPJRdfgz_-EZYEv-aTcpP22b3EzUu3NuzKRIcKohNQbUsdIQjmF3Io87y7LRB5FXMQRood4pTNNwZtfHWO9QqIlkGifNpQrqImEbCw23jZcaxVjiGIlf7e1rbndQhJYCumyXns8HkzTE0A2r2DsSeNkagqyWs=w492-h245" width="492" /></a></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">The picture shows us the outgoing thermal flux spectrum from earth. </span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">If there were no greenhouse gases, the (uv/visible/thermal) radiation going to space would be the area under the blue (Planck) curve.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">The green curve is the computed spectrum with all the greenhouse gases present except for CO2. </span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">The black and red lines are the energy fluxes for the CO2 concentrations for 400 ppm (part per million) and 800 ppm respectively.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">When doubling the earth's CO2 concentration from 400 to 800 ppm, the outgoing flux will decrease from 277 W/m2 to 274 W/m2. A change of 3 W/m2</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">IPCC fully agrees with this model. However, the dispute is ongoing whether the 3 W/m2 change will raise earth's average temperature by 1.4 degrees C (Happer) or 4.7 degrees C or even more (IPCC).</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">It looks like the greenhouse effect of CO2 is already more or less saturated. Doubling CO2 concentration probably does not make much difference.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">More on this subject:</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><a href="https://www.scienceunderattack.com/blog/2021/4/5/how-near-saturation-of-co2-limits-future-global-warming-74">https://www.scienceunderattack.com/blog/2021/4/5/how-near-saturation-of-co2-limits-future-global-warming-74</a></span></div><div class="separator" style="clear: both; text-align: left;"><br /></div><div class="separator" style="clear: both; text-align: left;"><br /></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhs87qVq-QwvAT6L5olC6RmlqxsMpVuZp_Dp_EL5-WcJ4WOHYeLwGwvRKW8EDV20UlNeVz0LFG8HCBPiS-doIRHSN0h777Vx-862glUQc941GjfMzU3NcG6dr20QPNHCMx8A6VzrELw3psgKlhmeJYyekxo1JWk9SQROtZedXqCGD1mnRr3cKYR5PIF/s406/Happer+1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="406" data-original-width="405" height="383" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhs87qVq-QwvAT6L5olC6RmlqxsMpVuZp_Dp_EL5-WcJ4WOHYeLwGwvRKW8EDV20UlNeVz0LFG8HCBPiS-doIRHSN0h777Vx-862glUQc941GjfMzU3NcG6dr20QPNHCMx8A6VzrELw3psgKlhmeJYyekxo1JWk9SQROtZedXqCGD1mnRr3cKYR5PIF/w382-h383/Happer+1.jpg" width="382" /></a></div><br /><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">A 40 minute YT-video from David Siegel shows the same graphs (and more..)</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><a href="https://www.youtube.com/watch?v=76Ln3Ou6jnc&t=1244s">https://www.youtube.com/watch?v=76Ln3Ou6jnc&t=1244s</a></span></div><div><br /></div><span style="font-family: arial;">More:</span><div><br /></div><div><a href="http://www.climatecurious.com/" style="background-color: white; box-sizing: border-box; color: #d10014; font-family: Roboto, sans-serif; font-size: 15px; outline: auto;">http://www.climatecurious.com/</a></div><div><br /></div><div><span style="font-family: arial;">Interesting as well:</span></div><div><br /><span style="font-family: arial;"><a href="https://www.klimaatfeiten.nl/">https://www.klimaatfeiten.nl/</a></span><p></p></div>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-19996266563403253672022-01-22T05:40:00.008-08:002022-01-22T06:01:32.783-08:00Royal KMM typewriter<p><span style="font-family: arial;">Yesterday I found a pretty nice old school mechanical typewriter in the second hand stuff store ("Kringloopwinkel"). It is a Royal KMM 'workhorse' typewriter. KMM stands for Key Set Tabulator, Magic Margin, Machine. Its original design dates back to 1939, pre WWII.</span></p><p><span style="font-family: arial;">It is produced in 1947 by the company Royal, which had its headquarters in New York City and its factory in Hartford, Connecticut (USA). I found that millions of this typewriter had been produced and have been spread all over the world.</span></p><p><span style="font-family: arial;">The one I bought shows severe marks of use, but a first trial indicates that most functions are still in tact.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhO2K43wB_XbMxYCtu2FQSkvHL0xU6j6r8J25XqeMm90zOwucIWU8LjwvsKqQo9E_8Qh4CQAO44dDZBMuoX6F_8KAR0_gK6KfJQLWqhfyCE3dRLB2OuGbnbzStzDdNJ81QRJZ4IrZlZ_4sb_mvvEfWg80JZW-JqE0X_XVzdUsoZhFYupgU980jP-49u=s4000" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="4000" data-original-width="3000" height="442" src="https://blogger.googleusercontent.com/img/a/AVvXsEhO2K43wB_XbMxYCtu2FQSkvHL0xU6j6r8J25XqeMm90zOwucIWU8LjwvsKqQo9E_8Qh4CQAO44dDZBMuoX6F_8KAR0_gK6KfJQLWqhfyCE3dRLB2OuGbnbzStzDdNJ81QRJZ4IrZlZ_4sb_mvvEfWg80JZW-JqE0X_XVzdUsoZhFYupgU980jP-49u=w332-h442" width="332" /></a></div><br /><span style="font-family: arial;"><br /></span><p></p><p><span style="font-family: arial;">I know this device does not need a battery and has nothing to do with radio. Sometimes I just like old mechanical stuff. But hee, doesn't the QWERTY keyboard look familiair to our PC keyboards ? (Yes, it does !).</span></p><p><span style="font-family: arial;">On YT, I found a nice movie from Joe Van Cleave who explains the typewriter functions in a clear way:</span></p><p><br /></p><p><span style="font-family: arial;"><a href="https://www.youtube.com/watch?v=pjn-XG_WgMQ">https://www.youtube.com/watch?v=pjn-XG_WgMQ</a></span></p><p><br /></p><p><span style="font-family: arial;">Anyway, I will be busy coming weeks trying to restore this incredible machine as much as possible in its original state (where can I buy the ink ribbon ??)</span></p><p><br /></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com8tag:blogger.com,1999:blog-2285391576429582736.post-85052978115903570342021-12-29T11:33:00.002-08:002021-12-29T11:58:41.572-08:00FT8 432 MHz activity Award<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhNvIRrb_pIfV96xHoYg9Q1Hyzx6Lv4TNlJguLU1E8U5lei0-RAEaWgCMGEwhDwmrSwOIOdYvWjCfuNGIKONmmNACumMA0bE98r2YTd36XCfi8nbuWvCfYS44tlr2afw_QaQWf3gu_u7GjjoUyoL4rYLz4WFzv0RO5JOxRzjGkKVw-hB-6bqdogwQ1V=s1667" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1128" data-original-width="1667" height="318" src="https://blogger.googleusercontent.com/img/a/AVvXsEhNvIRrb_pIfV96xHoYg9Q1Hyzx6Lv4TNlJguLU1E8U5lei0-RAEaWgCMGEwhDwmrSwOIOdYvWjCfuNGIKONmmNACumMA0bE98r2YTd36XCfi8nbuWvCfYS44tlr2afw_QaQWf3gu_u7GjjoUyoL4rYLz4WFzv0RO5JOxRzjGkKVw-hB-6bqdogwQ1V=w467-h318" width="467" /></a></div><br />PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com2tag:blogger.com,1999:blog-2285391576429582736.post-79019072942037612552021-12-14T05:46:00.006-08:002022-01-09T06:20:06.143-08:00Geminides<p><span style="font-family: arial;">This is a screenshot of Meteor Scatter (MS) signals received yesterday:</span></p><p><span style="font-family: arial;"></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjFQB8qL7l4ZiZ_5WbecS_H2ApGZUgfwFZWQDLoxro_tDUmvd8Y-ZnGu4_1wz2oy287kU3SSeiGLsdxPn1IBEUkGrswNdDZY5x83dH-qk3A2MSwV8slEsd5ezm5Q-ZuFKDzJCY3GcPAmY3-q7ePYiqxxVGga1xJ8J4DFfQKPXPZSEyL8nZ6bnXnkOdX=s4000" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="341" src="https://blogger.googleusercontent.com/img/a/AVvXsEjFQB8qL7l4ZiZ_5WbecS_H2ApGZUgfwFZWQDLoxro_tDUmvd8Y-ZnGu4_1wz2oy287kU3SSeiGLsdxPn1IBEUkGrswNdDZY5x83dH-qk3A2MSwV8slEsd5ezm5Q-ZuFKDzJCY3GcPAmY3-q7ePYiqxxVGga1xJ8J4DFfQKPXPZSEyL8nZ6bnXnkOdX=w455-h341" width="455" /></a></span></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">Strong signals from S59A in JO21dq ! </span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">As you can see I used the MSK144 mode on 50.280 MHz. Ftol was set to 200.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">I did not manage to make an MS QSO.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><br /></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhnk4rfLhcSyiv_szmwjIgzz5JglfIQApU1Q0S__DJUnV6VCPFcKS9hNeRYun2cSEDqzctCPrOzIbhx35X78UkU3JuEvkfZ9qtYfvn3fa7RYoPtRsFuuDzMKQgbajRryu2vx51lN861w-QqY5LtTthxSvT-fjE_0Wt0yQtt12-GzbaGHNAyVcuNCI9a=s1280" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="640" data-original-width="1280" height="199" src="https://blogger.googleusercontent.com/img/a/AVvXsEhnk4rfLhcSyiv_szmwjIgzz5JglfIQApU1Q0S__DJUnV6VCPFcKS9hNeRYun2cSEDqzctCPrOzIbhx35X78UkU3JuEvkfZ9qtYfvn3fa7RYoPtRsFuuDzMKQgbajRryu2vx51lN861w-QqY5LtTthxSvT-fjE_0Wt0yQtt12-GzbaGHNAyVcuNCI9a=w398-h199" width="398" /></a></span></div><span style="font-family: arial;"><div class="separator" style="clear: both; text-align: left;"><span> </span><span> </span><span> </span><span> </span><span> </span><span> </span><span> </span><span> Geminides</span><br /></div>Off-topic:</span><div><span style="font-family: arial;"><br /></span></div><div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjTX68_CsO-3FTafw_FlkWh1tXCBGTxGxlmTY7YBeZsEEk1Jtj-opN0t3WsYvEhaBbbxj6O6cYkT2kLY0g8sdEZu63u7L1M5LSZ_kaJhha7nyj9dWQX-mlHmAmpR59K4Qyl_9yU29S5j7niiUmHF2LWOMG-6PaowX46FDR81Me0gWncUM3Qbpu7yan8=s4000" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="3000" data-original-width="4000" height="240" src="https://blogger.googleusercontent.com/img/a/AVvXsEjTX68_CsO-3FTafw_FlkWh1tXCBGTxGxlmTY7YBeZsEEk1Jtj-opN0t3WsYvEhaBbbxj6O6cYkT2kLY0g8sdEZu63u7L1M5LSZ_kaJhha7nyj9dWQX-mlHmAmpR59K4Qyl_9yU29S5j7niiUmHF2LWOMG-6PaowX46FDR81Me0gWncUM3Qbpu7yan8=s320" width="320" /></a></div><div class="separator" style="clear: both; text-align: center;">Nieuwendijk; ferry to Tiengemeten</div><div class="separator" style="clear: both; text-align: center;"><br /></div><br /><span style="font-family: arial;"><br /></span><div><span style="font-family: arial;"> </span><p></p></div></div>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-14577495798383343102021-10-28T23:50:00.003-07:002021-10-31T05:02:52.855-07:00Airband receiver<p><span style="font-family: arial;">It is not difficult to receive nearby AM aircraft
transmissions in the VHF airband (118 – 136 MHz). The aircraft transmissions
use a bandwidth of 8.33 kHz. </span></p><p><span style="font-family: arial;"><br /></span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-55sU1Mj5NIU/YX6FxdtyMBI/AAAAAAAADqA/wyMAjOyXSMkWJFiNkOLyzcyYOCMgC-xEQCLcBGAsYHQ/s1250/netherlands-dutch-coast-guard-kustwacht-ph-cgn.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="722" data-original-width="1250" height="220" src="https://1.bp.blogspot.com/-55sU1Mj5NIU/YX6FxdtyMBI/AAAAAAAADqA/wyMAjOyXSMkWJFiNkOLyzcyYOCMgC-xEQCLcBGAsYHQ/w381-h220/netherlands-dutch-coast-guard-kustwacht-ph-cgn.jpg" width="381" /></a></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial; text-align: left;">Dutch coastguard Do228</span></div><br /><span style="font-family: arial;"><br /></span><p></p><p><span style="font-family: arial;">Since the ‘old fashioned’ modulation AM is used, a
simple detector (e.g. Schottky diode) can demodulate the airband waves. The
schematic below shows a simple receiver that enables you to receive (strong,
nearby) AM transmissions. Not a lot selectivity, so you may receive more transmissions on various frequencies at the same time..</span></p>
<p class="MsoNormal"><o:p><span style="font-family: arial;"></span></o:p></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;"><a href="https://1.bp.blogspot.com/-Vn0AFis51gk/YXuZIJr1xzI/AAAAAAAADpY/O_4Mm5N6LxgSL2MavH2Fz4plwoZtgLYqQCLcBGAsYHQ/s843/airbandrx.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="386" data-original-width="843" height="189" src="https://1.bp.blogspot.com/-Vn0AFis51gk/YXuZIJr1xzI/AAAAAAAADpY/O_4Mm5N6LxgSL2MavH2Fz4plwoZtgLYqQCLcBGAsYHQ/w412-h189/airbandrx.jpg" width="412" /></a></span></div><span style="font-family: arial;"><br /> </span><p></p><p class="MsoNormal"><span style="font-family: arial;">More info about this design:</span></p>
<p class="MsoNormal"><span style="font-family: arial;"><a href="http://techlib.com/electronics/aircraft.htm">http://techlib.com/electronics/aircraft.htm</a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p><span style="font-family: arial;"> </span></o:p></p>
<p class="MsoNormal"><span style="font-family: arial;">I was intrigued by a similar design - using PNP transistors - a long time ago. It was
a design from the book “Jongensradio” from 1967. I never built it. </span><o:p></o:p></p><p class="MsoNormal"><span style="font-family: arial;"><br /></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-RIb5uLBys5g/YXuZRAOlQ-I/AAAAAAAADpc/2Hdts2MABl0Wd4zufAbLIbkFiQSyP-w4wCLcBGAsYHQ/s986/metergolfjongradio.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="341" data-original-width="986" height="189" src="https://1.bp.blogspot.com/-RIb5uLBys5g/YXuZRAOlQ-I/AAAAAAAADpc/2Hdts2MABl0Wd4zufAbLIbkFiQSyP-w4wCLcBGAsYHQ/w546-h189/metergolfjongradio.jpg" width="546" /></a></div><br /><span style="font-family: arial;"><br /></span><p></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com11tag:blogger.com,1999:blog-2285391576429582736.post-87330789262896054892021-09-26T06:54:00.004-07:002021-09-26T07:13:12.498-07:00Doggerland<p><span style="font-family: arial;">No, Doggerland is not a new DX entity. </span></p><p><span style="font-family: arial;">Doggerland was the land between England and Holland/Belgium/Denmark appr. 10,000 years ago. The Northsea has taken its place nowadays.</span></p><p><span style="font-family: arial;"><br /></span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-PXGibKz_5RI/YVB2JC2mwuI/AAAAAAAADn4/9El3G-HdZp88qcGwZt4ggwI3_W1wLyArACLcBGAsYHQ/s508/doggerland.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="418" data-original-width="508" height="263" src="https://1.bp.blogspot.com/-PXGibKz_5RI/YVB2JC2mwuI/AAAAAAAADn4/9El3G-HdZp88qcGwZt4ggwI3_W1wLyArACLcBGAsYHQ/s320/doggerland.jpg" width="320" /></a></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: arial;">Doggerland, abt. 10,000 years ago</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">Past years the Northsea has shown to be a gigantic storage of fossils. Fossils from The Netherlands, with Doggerland as origin, can be found on the Dutch beaches, in particular Maasvlakte2 and the Zandmotor (near Kijkduin). The sand used for those beaches comes from the Northsea floor and contains fossils.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">I have visited Maasvlakte2 a couple of times and have found some small bones of mammals from the Pleistocene.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">Interesting to know is that the Northsea level rise was 5 - 10 cm a year those days. Past 100 years the Northsea level rise is appr. 1.5 mm (millimeter) a year.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">I got in contact with Kommer Tanis, a fisherman who lives in Havenhoofd, close to where I live on Goeree-Overflakkee. Kommer is a fossilhunter and has been collecting fossils for the past 40 years. Between the fishes he catches, sometimes there are fossils. Kommer has a nice fossile collection at home. In his workshop he prepares the fossils.</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-jYeTxb7Do-s/YVB39x5DMGI/AAAAAAAADoA/4ngpaULLsGoaykVJvPBocPpsN-EXjzuoACLcBGAsYHQ/s2048/mammoet1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="320" src="https://1.bp.blogspot.com/-jYeTxb7Do-s/YVB39x5DMGI/AAAAAAAADoA/4ngpaULLsGoaykVJvPBocPpsN-EXjzuoACLcBGAsYHQ/s320/mammoet1.jpg" width="240" /></a></div><br /><div style="text-align: center;"><span style="font-family: arial;">The big bones are mammooth bones</span></div><div style="text-align: center;"><span style="font-family: arial;"><br /></span></div><div style="text-align: center;"><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-x9Ahy2kN6g4/YVB4XEujBUI/AAAAAAAADoI/3DppJQ-95YcUm1zJW67CE9xhFliXFO-DQCLcBGAsYHQ/s2048/paarden.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1536" data-original-width="2048" height="240" src="https://1.bp.blogspot.com/-x9Ahy2kN6g4/YVB4XEujBUI/AAAAAAAADoI/3DppJQ-95YcUm1zJW67CE9xhFliXFO-DQCLcBGAsYHQ/s320/paarden.jpg" width="320" /></a></div><br /><span style="font-family: arial;">Mainly horse bones / yaws</span></div><div style="text-align: center;"><span style="font-family: arial;"><br /></span></div><div style="text-align: center;"><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-cyUAyv6f3CM/YVB4s4Ch9XI/AAAAAAAADoQ/z-Bdr4qSjfMsACbqzdzeenZa7_-XRYsCACLcBGAsYHQ/s2048/mammoetkaak.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="1536" height="320" src="https://1.bp.blogspot.com/-cyUAyv6f3CM/YVB4s4Ch9XI/AAAAAAAADoQ/z-Bdr4qSjfMsACbqzdzeenZa7_-XRYsCACLcBGAsYHQ/s320/mammoetkaak.jpg" width="240" /></a></div><br /><span style="font-family: arial;">Mammooth yaw with 3 enormous teeth</span></div><div style="text-align: center;"><span style="font-family: arial;"><br /></span></div><div style="text-align: center;"><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-L5d_7EfznHY/YVB5UAt2TCI/AAAAAAAADoY/8H13hcf6fdMjzfaf9JDtO9VwYxkjY8BlwCLcBGAsYHQ/s2048/hertegewei.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1536" data-original-width="2048" height="240" src="https://1.bp.blogspot.com/-L5d_7EfznHY/YVB5UAt2TCI/AAAAAAAADoY/8H13hcf6fdMjzfaf9JDtO9VwYxkjY8BlwCLcBGAsYHQ/s320/hertegewei.jpg" width="320" /></a></div><br /><span style="font-family: arial;"><br /></span></div></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">Kommer has a small shop where he sells some of his fossils. The above picture shows part of a deer antler which I took home (Estimated 12,000 years old).</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;">If you want to get in contact with Kommer Tanis, you can e-mail him: tanisfossils(at)go6tanis.nl</span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: left;"><span style="font-family: arial;"><br /></span></div><p></p><p><br /><span style="font-family: arial;"><br /></span></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-60360487244972675222021-09-11T03:02:00.000-07:002021-09-11T03:02:05.517-07:00UHF amplifier under test<p><span style="font-family: arial;">Last FT8 EU contest on 70 cm I participated with my homebrewed 50 Watt UHF amplifier. The amplifier uses an MRF186 in the final stage to boost the 5 Watt RF signal coming from the 28-432 MHz transverter. The amplifier seems to work well. I was able to make 25 QSO's during the evening (PA, ON, F, DL and G stations). </span><span style="font-family: arial;">Best DX was with Richard G7KHV in East Yorkshire (IO93vw) over 392 km.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-fYRlECzO7Ms/YTx9oR9sUmI/AAAAAAAADnA/-2mm9WSWz2QtCnG2J6ojHo8Pfrpi_SmoQCLcBGAsYHQ/s529/_cfimg4875817755998245000.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="337" data-original-width="529" height="281" src="https://1.bp.blogspot.com/-fYRlECzO7Ms/YTx9oR9sUmI/AAAAAAAADnA/-2mm9WSWz2QtCnG2J6ojHo8Pfrpi_SmoQCLcBGAsYHQ/w441-h281/_cfimg4875817755998245000.png" width="441" /></a></div><p><span style="font-family: arial;">FT8, 432 MHz signals</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-O5C_m_AMG7M/YTx-PgdjT0I/AAAAAAAADnU/52084Fg15UoGGl1_LbRuYMsdV_Ukd5LAACLcBGAsYHQ/s2048/screen.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1536" data-original-width="2048" height="328" src="https://1.bp.blogspot.com/-O5C_m_AMG7M/YTx-PgdjT0I/AAAAAAAADnU/52084Fg15UoGGl1_LbRuYMsdV_Ukd5LAACLcBGAsYHQ/w437-h328/screen.jpg" width="437" /></a></div><br /><span style="font-family: arial;"><br /></span><p></p><p><span style="font-family: arial;">Amplifier under test</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-yfmcd5cceqI/YTx9149Jj8I/AAAAAAAADnE/zDo0Ax-xBeUo5K1_BCOLufv5gTjYuUuJgCLcBGAsYHQ/s2048/uhfampMRF186.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1536" data-original-width="2048" height="302" src="https://1.bp.blogspot.com/-yfmcd5cceqI/YTx9149Jj8I/AAAAAAAADnE/zDo0Ax-xBeUo5K1_BCOLufv5gTjYuUuJgCLcBGAsYHQ/w403-h302/uhfampMRF186.jpg" width="403" /></a></div><p><br /></p><span style="font-family: arial;">Housed in old Onkyo receiver case</span><p></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/--L4IimEHeT4/YTx-Eff9M3I/AAAAAAAADnM/1iHHZPVmMrETPqtDQ-MEdflzIY5RYexbwCLcBGAsYHQ/s2048/uhfampcased.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1536" data-original-width="2048" height="307" src="https://1.bp.blogspot.com/--L4IimEHeT4/YTx-Eff9M3I/AAAAAAAADnM/1iHHZPVmMrETPqtDQ-MEdflzIY5RYexbwCLcBGAsYHQ/w410-h307/uhfampcased.jpg" width="410" /></a></div><br /><span style="font-family: arial;"><br /><br /></span><p></p><span style="font-family: arial;"><br /></span><p></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com2tag:blogger.com,1999:blog-2285391576429582736.post-64358182880271656972021-08-22T06:33:00.006-07:002022-05-12T07:11:33.055-07:00LPF for 70 MHz<p><span style="font-family: arial;">The RF output of my 28 - 70 MHz transverter shows an irritating 3rd harmonic at 210 MHz. </span></p><p><span style="font-family: arial;">I found a simple Low Pass Filter for 70 MHz at <a href="http://dutchrfshop.nl">dutchrfshop.nl</a> </span></p><p><span style="font-family: arial;">The filter should be able to handle RF powers up to 150 Watts.</span></p><p><span style="font-family: arial;">4 ATC capacitors and 3 coils is all you need:</span></p><p></p><div class="separator" style="clear: both; text-align: justify;"><a href="https://1.bp.blogspot.com/-ZO3EVnZF--8/YSJRSdekz7I/AAAAAAAADls/EkfEpnVnGbglPeaW8ynvdi4Q4glDQKxYwCLcBGAsYHQ/s680/circuitLPF.jpg" style="margin-left: 1em; margin-right: 1em;"><strike><img border="0" data-original-height="173" data-original-width="680" height="130" src="https://1.bp.blogspot.com/-ZO3EVnZF--8/YSJRSdekz7I/AAAAAAAADls/EkfEpnVnGbglPeaW8ynvdi4Q4glDQKxYwCLcBGAsYHQ/w512-h130/circuitLPF.jpg" width="512" /></strike></a></div><div class="separator" style="clear: both; text-align: justify;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: justify;"><span style="font-family: arial;">Arranged on a PCB as follows:</span></div><div class="separator" style="clear: both; text-align: justify;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: justify;"><div class="separator" style="clear: both; text-align: justify;"><a href="https://1.bp.blogspot.com/-9JBD_1CRMSo/YSJRmOMkWsI/AAAAAAAADl0/ch44RBn6iBoEsZ5ITinfKD8EFAiWcksDQCLcBGAsYHQ/s671/PCBLPF70MHz.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="338" data-original-width="671" height="228" src="https://1.bp.blogspot.com/-9JBD_1CRMSo/YSJRmOMkWsI/AAAAAAAADl0/ch44RBn6iBoEsZ5ITinfKD8EFAiWcksDQCLcBGAsYHQ/w453-h228/PCBLPF70MHz.jpg" width="453" /></a></div><div class="separator" style="clear: both; text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;"><span style="font-family: arial;">Some finetuning using the nanoVNA shifted the dip @ 70 MHz;</span></div><div class="separator" style="clear: both; text-align: justify;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: justify;"><div class="separator" style="clear: both; text-align: justify;"><a href="https://1.bp.blogspot.com/-PhqHAdl-b3Y/YSJR5LtQmkI/AAAAAAAADl8/laSGzTuxGX8IGwgPvWYE3rA1yAoWwvxjwCLcBGAsYHQ/s2048/filterafregel.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1536" data-original-width="2048" height="296" src="https://1.bp.blogspot.com/-PhqHAdl-b3Y/YSJR5LtQmkI/AAAAAAAADl8/laSGzTuxGX8IGwgPvWYE3rA1yAoWwvxjwCLcBGAsYHQ/w395-h296/filterafregel.jpg" width="395" /></a></div><div class="separator" style="clear: both; text-align: justify;"><br /></div><span style="font-family: arial;">Next step is to test the LPF with the transverter..</span><br /><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: justify;"><span style="font-family: arial;">Off-topic: Old QSL card</span></div><div class="separator" style="clear: both; text-align: justify;"><span style="font-family: arial;"><br /></span></div><div class="separator" style="clear: both; text-align: justify;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzRWkBrzv3WUbyE6zO4ZqgbL3ZrMSCAC1ab-U2X-qjpz_4CXf2dCHYzT1YzmLGVOLmcl_OFRE1A1CGXNYjErr3-ena6uKHy7J-c49AFEayE7Zs6ovdGQyqjcokQzrwKO9qy0Vk4UHfXk0HjgfLMcRJWcnrwks4WkLu8OH9QOlrEBiNxwIGFu26Op9b/s1655/QSL-PA2RF.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1062" data-original-width="1655" height="295" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzRWkBrzv3WUbyE6zO4ZqgbL3ZrMSCAC1ab-U2X-qjpz_4CXf2dCHYzT1YzmLGVOLmcl_OFRE1A1CGXNYjErr3-ena6uKHy7J-c49AFEayE7Zs6ovdGQyqjcokQzrwKO9qy0Vk4UHfXk0HjgfLMcRJWcnrwks4WkLu8OH9QOlrEBiNxwIGFu26Op9b/w461-h295/QSL-PA2RF.jpg" width="461" /></a></div><br /><span style="font-family: arial;"><br /></span></div><br /><span style="font-family: arial;"><br /></span></div><br /><span style="font-family: arial;"><br /></span><p></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com0tag:blogger.com,1999:blog-2285391576429582736.post-81307088314052246782021-08-22T03:44:00.003-07:002021-08-22T06:38:02.377-07:00Crypto for radio gear<p><span style="font-family: arial;">A couple of months ago I started to trade a bit crypto currency. The idea was to obtain some extra cash for the radiohobby.</span></p><p><span style="font-family: arial;">I was intrigued by what was going on in the crypto currency community. Learned a lot about altcoins, bullish, bearish, blockchain, ECB, Elon Musk, whales, graphs, quantitative easing. With some trading of Bitcoin, Ethereum, ADA and Dogecoin I have been able to gain some extra's to buy radio stuff.</span></p><p><span style="font-family: arial;">What's your opinion on crypto currency ?</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://1.bp.blogspot.com/-UC_6Tt5b_oM/YSIp-ptzYFI/AAAAAAAADlk/v7mQDIPj95ATy7W4CVKWvCvCWj24eAKkgCLcBGAsYHQ/s600/bitcoin.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="376" data-original-width="600" height="201" src="https://1.bp.blogspot.com/-UC_6Tt5b_oM/YSIp-ptzYFI/AAAAAAAADlk/v7mQDIPj95ATy7W4CVKWvCvCWj24eAKkgCLcBGAsYHQ/s320/bitcoin.jpg" width="320" /></a></div><br /><span style="font-family: arial;"><br /></span><p></p><p><span style="font-family: arial;"><br /></span></p>PA2RFhttp://www.blogger.com/profile/14639959863827712083noreply@blogger.com4