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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...
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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 (!)HighlightsWith OLED displayHost computer USB & serial portIntegrated...
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DVB-T TV dongle as Wideband receiver
A couple of years ago I had good experiencies with a TV stick as broadband receiver: https://www.pi4raz.nl/index.php?option=com_content&task=view&id=3180&Itemid=46This time I used a...
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ADS-B receiver
I have been able to capture aircraft flying above me by receiving theirADS-B 1090 MHz signal via the discone antenna on the roof.For this purpose the TV dongle is used in combination with the...
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Weather station
The Alecto WS-4800 weather station that I installed provides interesting data about the local weather.The station consists of an indoor and outdoor unit that communicate over a 868 MHz datalink.The...
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PA60HAL
To commemorate the 60th anniversary of the launch of SS Rotterdam, a special call and eQSL for PA60HAL are introduced:
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Use of digimodes on 319 THz
I enjoyed building a simple infrared transmitter and receiver.The circuits are designed around IR LEDs using a wavelength of 940 nm (frequency 319 THz).On this high frequency it was simple to transmit...
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Nice book
I was lucky today. Found this book from 1976, author Albert Smith.I like the maths from the early 60's.
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QSL from the past
In the eQSL inbox of my former callsign PH0RF, I found a QSL from Vlad YL2GC from Latvia. The QSO was from 2004 in SSB (20 meter band);Off topic:Steam locomotive over the Lek bridge in Culemborg, 28...
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Butterfly capacitor
Yesterday I had the opportunity to see the making of a butterfly variable capacitor by Gerard, PA2G. This capacitor will be used in concert with a 1.7 meter diameter aluminium magnetic loop antenna....
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Nice FM Broadcast receiver
Nice small FM receiver (broadcast, 87.5 - 108 MHz) connected to speakers this morning and discovered it has a good sensitivity. Antenna: single wire of appr. 80 cm.Allthough the receiver is designed to...
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PA100KLM
The call PA100KLM was acquired by HAM Operators that participate in the station PI9KLM.These are (but not limited to) PA0PCV, PA0WBZ, PA0SNY, PA3GDF, PH0PPL, PA2AAP and PA2MCE.PI9KLM (see...
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AM Stereo
Now and then I dismantle vintage audio equipment. It is good to see how professionals have designed their equipment. This time I had a closer look at the Denon AM-FM Stereo Tuner UTU-F88. I think it...
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Fibonnaci and sunflowers
An off topic item this time; a little mathematics from my garden.One takes a head of a sunflower, let it dry for a while and concentrates on the seeds and their arrangement.The arrangement of spirals...
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Headphone amplifier
The headphone amplifier with VU-meters almost finished:The pre-amp uses two NE5532 low-noise integrated...
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Kilrock Radio
On Medium Wave I discovered 'Kilrock Radio'. They broadcast rock music from the '50-'80s. This is a small radio broadcast station located near Dordrecht. They transmit with 100 Watt RF power on 1287...
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28 MHz - 432 MHz transverter
I started to work on a transverter that converts 28 MHz (10 m band) to 432 MHz (70 cm band). I use a FT450 to process the 28 MHz signals. At 432 MHz the transverter is capable of delivering about 5...
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First FT-8 signals transmitted on 432 MHz
Yesterday I transmitted my first FT-8 signals on 432.176 MHz. PA3EWP received those signals:At the moment of transmission the 28MHz-432MHz transverter delivered 2 Watts only.
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