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I wanted to see if you could cheaply power and run a WSPR transmitter from a battery and solar panel. The system was connected for 7 days, transmitting around 80% of the time, day and night. The project is detailed online. … Continue reading
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This article looks at making a 6e beam for 70 Mhz. I’ve added some construction tips and links to the website to help anyone wishing to construct something similar. I would usually construct beams designed by DK7ZB, but this website allows you to select … Continue reading
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THE YAESU 857 ‘M’ – A ROBUST PORTABLE STATION – DEVELOPED BY DAVID COLES – M0IDF I developed my /P station around the Yaesu FT-857D. It’s a terrific choice for portable use being small, capable and offering higher power levels … Continue reading
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I have added multi band options to the U3S recently. Part 2 of the project deals with the addition of the switched LPF relay board and additional LPF. You can read the story of the construction, thankfully without the addition … Continue reading
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I have assembled a 30 metre low-pass filter from Language Spy (link here) and soldered header pins to the GPIO on the Raspberry Pi zero. Note that the Pi-LPF kit uses surface-mount components and provides a 7-pole Chebyshev low-pass filter … Continue reading
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This long bank holiday weekend provided an ideal opportunity to try out the recently constructed 70 MHz slim Jim. The antenna is quite easy and cheap to assemble from either 300 Ohm or 450 Ohm ladder line. John M0UKD has … Continue reading
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Ron G6LTT bought a PIC-based Radio-Kits SWR Meter kit (more info here) about 3 years ago at the same time as I bought mine. He still hadn’t assembled it, so I volunteered to build it for him. Pictures below…. 73 Derek … Continue reading
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Whilst on the course for my foundation exam in February, I still had the word’s of John Mulye G0VEH ringing in my ears.. “Why go out and buy a load of ready-made rubbish when you can make your own with … Continue reading
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I have been messing around with the DVB-T SDR thing again, this time to download and decode ADS-B (Automatic Dependent Surveillance–Broadcast) signals. All aircraft transponders transmit data on 1090 MHz. The antenna used is a discone in the loft. The … Continue reading
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I have assembled a GPS module to a breakout board for use with the WSPR transmitters that I have brought from Hans Summers G0UPL (www.hanssummers.com – more info here). Delivery should be any day now :-). The GPS module, from … Continue reading
