28MHz Test Source GW4RWR

This single transistor was to make a toy car reverse direction, when it used a PTT to generate carrier on 27.145, with 30cm telescopic antenna. It now operates on 28.138 and 28.197 MHz. It produces 5mW.
In 2024 I first connected this to an antenna. Reverse Beacon Network results are below. Most reports are 6-9dB SNR.

The source has been useful for measuring feeder loss; I have a mW meter, and what reaches my antenna after feeders and jumper losses can be less than manufacturers' figures predicts!