Thursday, 18 July 2019

Geekcreit GHz Signal Generator

Geekcreit offers a nice signal generator board for appr. 30 euros with microchip ADF4351. Frequency range 35 MHz - 4.4 GHz (!)


With OLED display
Host computer USB & serial port
Integrated key operation
Good man-machine interface
Many improvements on the phase noise, phase spurious and loop filter
Module has 35 MHz - 4.4 GHz frequency output, point frequency, sweep, frequency hopping and other basic functions
Dimensions: 88mm * 67mm
Power supply: 5V-15V (DC 5.1MM); 5V (USB)
Bandwidth: ADF4351: 35MHz - 4.4GHz; ADF4350: 137MHz - 4.4GHz
Module step: 100KHz(min)
Frequency error: ± 1KHz
Output: OUTA OUTB two way
Module phase noise: better than -100dBc @ 10KHz (noise is different with different band phase)
Module output power: 7dBm (MAX)
Module interface: The external communication port of the STM32 USB can be configured to USB or analog serial port (in default)
Module program download mode: SW module, three-wire system (GND SWCLK SWDIO)

Friday, 21 June 2019

First Transatlantic 144 MHz contact

A historic contact was made on Sunday the 16th June 2019 when the Atlantic was spanned for the first time on 144 MHz.

D41CV on Cape Verde Islands off the coast of Africa managed to work FG8OJ in Guadeloupe on 144.174 MHz using the FT8 digital mode. The distance was an incredible 3,867 kms.

Sunday, 9 June 2019

Rotterdam Tramway Company

The RTM (Rotterdam Tramway Company) Museum in Ouddorp houses a collection of steam and diesel locomotives, as well as beautifully restored carriages and goods wagons, of which some are still in use today.  
You can wander round the depot and admire the old post van and the last surviving camping coach.

I made this photo of the tracks:

Steam tram from 1906:

Diesel tram inside the depot:

Monday, 3 June 2019

First 2m QSO with UK

After completing the prototype of the interface circuit I was able to operate with FT-8 using the almost 40 year old FT-480R transceiver. June 1 I made some FT-8 contacts of which the one with Mike, G3YPP (QTH loc. JO02rv) was quite interesting for me, since this was my first 2m QSO with UK on 144 MHz (using a modest discone antenna at 4 meters above sealevel and 5 Watts RF).

Protoype interface:

Tuesday, 28 May 2019

Nice Es 2m FT-8 signals today

With a distance of 3134 km, the 144 MHz signals of EA8DBM reached my FT-480R transceiver today:

Monday, 27 May 2019

First FT-8 2m RX on 144.175 MHz

In order to be able to use FT-8 (and digimodes in general) on 2m, one must be able to select the USB mode. On eBay I found a nice FT-480R, capable of operating in USB.

The Yaesu FT-480R is a mobile transceiver designed around 1980. Yesterday I made the first FM QSO with this device. PI4VHW (Location Fortress Numansdorp) respondend to my FM call on 145.550 MHz.

Today I connected the rig to my PC in order to decode the first FT-8 signals (144.175 MHz):

Saturday, 13 April 2019

6m propagation to OH

Today there were good propagation conditions in the direction of Finland, OH.

I made a good QSO with OH5ELO on 50.313 MHz (FT8 mode). Used 10 Watts RF from my FT450 transceiver.

Friday, 15 March 2019


Recently I found some pre-historic material on the Maasvlakte2 beach. This area has been created from  Northsea sand. This sand contains lots of (pre) historic material.
Sea-level 100.000 years ago was 50 - 100 meter below current sealevel; there was no Northsea. The Netherlands and Brittain were connected through Doggersland.

Beach, Maasvlakte2

Piece of mamal bone. Estimated age: 65.000 years (Early Weichselin)

Fossilized oyster (Ostrea Edulis). Estimated age: 15.000 years (Holocene)

You can check your collected material here:

Nothing to do with radio, but not only radios are fascinating.

Wednesday, 20 February 2019

First geostationary amateur satellite succesful


Web SDR:

More info:

Es’hail-2 was launched in 2018. This geostationary satellite (fixed at a distance of appr. 36.000 km from earth) carries two “Phase 4” radio transponders operating on radio amateur frequencies (2400 MHz uplink, 10450 MHz downlink). A linear transponder has a bandwidth of 250 kHz and is intended for conventional analogue radio communications. Another transponder has a 8 MHz bandwidth and is designed for experimental (DVB) amateur television.

First ham QSO’s have been realized.

E.g., G0MGX was able to receive the satellite’s signals with an (ordinary) satellite dish:

Wednesday, 6 February 2019