Category Archives: Homebrew Projects

New AD9959 DDS

It has been a while since my last blog update, work has been keeping me busy so having found some quality time to kick off the next radio project I went back to the VFO design, which to me is the heart of any SSB transceiver. Following on from my last experiment with the Analogue… Read More »

Radio Silence

Been a while doing anything radio-related, updating this site has been low on the TODO list due to work commitments. However, there are new projects in the pipeline which include four homebrew transceivers – yes four! 144Mhz, 70MHz, 50MHz, 28MHz separate units with a nostalgic twist – watch this space!

HB70 – 70MHz SSB Transceiver update

Both the receiver and transmitter stages are now complete, apart from the S-Meter driver board which is not really key at this stage. I can see the finish line and perfect timing for the 2018 Es propagation season – more to follow over the Easter weekend, I might even get some of the boards wired… Read More »

Hearing signals on 70MHz

Receiver section under test, GB3ANG beacon in Dundee weak but readable with homebrew 3 element Yagi 5 foot above ground level – going to brave the rain and try and get the antenna another 10 feet in the air! Here is a short video of the receiver in action – messy lash up for testing… Read More »

DC Protection and Distribution Unit

I have designed an elaborate DC Protection and Distribution unit for the 70MHz SSB transceiver project, the purpose of this module is to provide two stage reverse polarity protection, power on/off switching, filter and a switched DC bus for transmit and receive. I have designed the 70MHz linear power amplifier (yet to be finished) to provide… Read More »

Amateur Radio Software

Impedance matching transformer calculator Please feel free to download this software and use it to aid designing toroidal and multi-aperture core transformers for matching Crystal Filters and interstage coupling transformers. The software is provided as-is with no warranty, please feel free to distribute the software to others however please make sure you give me credit… Read More »