Monday, 27 March 2017


Ashar Farhan has developped a compact HF transceiver with following characteristics:

- 10 Watts PEP on lower HF bands
- SSB and CW
- Minimal controls
- Based on Arduino controller and one Si5351 for all local oscillators
- Double conversion, high IF superhet architecture
- Easy to build, low priced components used

Enjoy his article:

And the interview

Friday, 24 March 2017

USB Microscope

In order to be able to do visual inspections of PCB’s or components I normally use a magnifier glass. Where the magnifier glass offers a magnification of 5X, a low-cost USB microscope can give you 20..500X.
The USB microscope I ordered for about 15 euro gives interesting results. It contains 8 white LEDs that illuminate the object to be investigated from above. The focus range and magnification can be adjusted.  LED Light intensity can be changed. It really turned out to be a plug-and-play device. Plug in the USB connector, install the software and enjoy the pictures (and even moving images). Great fun.

USB Microscope set-up and PCB:

Dove's feather

5 cents Euro coin

 Sanding paper

 30 pF capacitor

Off-topic; tulip fields, April 2017, 100 meters from our backyard

Sunday, 20 November 2016


I do not have access to hi-speed data links such as fibre optics ("glasvezel") in my new QTH Zuidzijde near Den Bommel at Goeree-Overflakkee (QTH locator JO22dq). 6 weeks without TV was not that difficult, but it would be nice to see some moving pictures now and then.

I discovered that people in the neighbourhood use satellites to receive TV transmissions.

CanalDigital is a popular satellite TV-provider. I bought a satellite dish and satellite receiver from them. After installing the satellite dish and programming the receiver, now I am able to receive about 300 stations from which a lot transmit in High Definition (HDTV).

In order to receive the Astra3 satellite, elevation of the dish is 29.5 degrees and azimuth is 23.5 degrees east. 15 meter coaxial low loss cable connects the dual LNB to the M7 receiver.

Satellite dish installed

Astra3  (at 23.5 East) receive parameters

Lighthouse in Ouddorp

Ouddorp beach

Tuesday, 4 October 2016


Picture of our next QTH: Zuidzijde on the island of Goeree-Overflakkee:

View on the harbour of "Stad aan het Haringvliet", a village about 8 km from Zuidzijde:

Low-lying land ("polder") near Dirksland

Steamtram station Middelharnis

Tulip field in the vicinity of the water tower from Zuidzijde

Same tower (built 1934), view from our garden

Saturday, 11 June 2016

47 Amps Power Supply

Henny, PA3HK, had some used Hewlett Packard Power Supplies for sale. Yesterday I picked up one. It is a rather small unit (27 x 6 x 6 cm) and is capable of delivering 47 Amps (!) at 12 Vdc.
I made the small modifications to get it to work (3 jumpers installed and a 27 ohms resistor in the power supply of the fan) and now the unit runs fine.

I intend to use it for the 145 MHz transverter discussed earlier.

Tuesday, 17 May 2016

First 2m SSB QSO

First 2m SSB QSO realized with homemade transverter (See my blogspot article April 23)
Henk, PE0HZD replied on my request to make an USB QSO on  144.550 MHz.
Allthough our station distance (Zoetermeer Buytenwegh .. Oosterheem) is about 5 km´s it is worth to mention it..

Sunday, 24 April 2016


Last Wednesday evening there was a micromoon in a clear sky. A good opportunity to make some photoos. I found Jupiter in the constellation Lion.

                                                        Constellation Lion

Jupiter is the large dot left from the middle, the star Regulus (a blue giant) is on the right

The picture was taken from the 'silence area' near Weipoort. With an exposure time of 8 seconds and the light from the micro moon the area was captured:

Some amateur astronomers make beautiful pictures from the planets. For example Richard Bosman:
He made this nice photoo from Jupiter:

Saturday, 23 April 2016

145 MHz transverter

I found an interesting article in Funk magazine from May 1999.
It describes a 28 MHz to 145 MHz transverter.
Since I would like to use SSB modulation on 2 meter I am considering to make a transverter based on the schematic shown here:

My Yaesu FT450 can be used for the 28 MHz Intermediate Frequency processing.
Then all modulations (AM, FM, SSB, CW, digimodes) will come available.

I still have a power module M57719 (145 - 175 MHz) from Mitsubishi waiting to be used; this module can be used to boost the RF power of the transverter to a level of 14 Watts although I am not sure whether the power module can handle AM and SSB signals.

Wednesday, 20 April 2016

eQSL from Albania

This week I received my first eQSL from Albania from a digimode QSO I had Augustus 2006 with Dimitri. The callsign of Dimitri is ZA/IW2JOP.

                                  eQSL from ZA/IW2JOP
                                                      Albanian scenery

Saturday, 19 March 2016


Betelgeuse is the ninth-brightest star in the night sky and second-brightest in the constellation Orion. The distance to us is estimated at 640 lightyears. 

It is a first magnitude star and with the bare eye you can see it is reddish. The star's name is derived from the Arabic Ibt al-Jauza, meaning "the hand of Orion". 

I managed to make a photo of Betelgeuse ("Betelgeuze" in Dutch) early this month with my Canon1000D. An exposure time of 12 seconds was good enough to capture the red supergiant (30 times the mass of the sun).

It is funny to realize that the light that Betelgeuse emitted in the year 1376 arrived in 2016 on earth. In 1376, Yusuf III, Sultan of Granada was born.

January 2013 I made this photo of Orion. Brightest star Rigel is found in the right hand lower corner.