Now that the 'mystery signal' of last week has been identified and decoded by a number of people, I'll be transmitting Low Speed Sequential Multi Tone Hellschreiber again this weekend on 137.6kHz, th
Hi Andy, What I presume was the 20Hz bandwidth signal transmitted in the morning, was quite readable, but weak. How do we give reports for these transmissions? The 2.5Hz bandwidth signal was bright a
Tomorrow, I may run much lower power on 5Hz or 2.5Hz span. So if the signal appears much weaker than today's it will be because I'm using a 10 Watt amplifier module instead of the usual 250W job (thr