Quick video monitoring GB3ANG beacon on 70.020MHz in Scotland from my QTH here in Newcastle upon Tyne – a tad over 113 miles away.
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 »
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 »
Back on to the homebrew 70MHz SSB transceiver project having been consumed with work and stuck in a “over thinking” loop re-designing the 70MHz transceiver receive front end module I have now completed a working unit – third attempt! So, to cover off my initial attempts I was stuck with problems like little or no… Read More »
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 »
Well, having taken a pause on the build of the big rig, the HF642 I am taking a slight diversion for a few months and designing a single band, 70MHz SSB transceiver. Keep checking back for progress info on both projects, I am easily distracted so hopefully this will not turn into two expensive half-baked… Read More »
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 »
Starting to look like a radio… The front panel assembly has started, next stage is to wire all of the controls, meter and display. The black bezel was formed by using a piece of clear perspex sheet with the meter and display windows masked off then spray painted using car bumper spray paint on the… Read More »
Here is a short video showing the modified W7ZOI s-meter driver in operation.
Little bit of playing around with the IF stage today, finished the C++ code for the IF Shift feature – here is a short video listening to a QSO on 40 meters. A second video listening to Volmet on 5.450 and 5.505MHz, no BPF or preamp just random wire straight into first mixer.