In talks with Joachim, PA1GSJ we decided to build the simplest possible (construction wise) transmitter for 28MHz.
Using a "canned" - in my case IC-like housing - oscillator on 28.322 MHz and a 74HC(T)240 as the "power amplifier" it is possible to get an output of around 50 mW, sufficient for a QRSS MEPT.
Joachim already has his model working, and I am in the process of building mine. The oscillator is there (duh)and the "PA" is just about wired, now I need to make the keyer , will be using a PICAXE processor, and the output matching circuit/low pass filter.
Opening on the 40 MHz band between the UK and Australia - 8th Nov 2025
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Even though we have passed the peak of the current sunspot cycle,
conditions on the higher HF bands and the low VHF region are still very
good.
On the 8...
10 hours ago
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