Today I received a permit for experimental transmissions on the 500 kHz band, 501.000 - 504.000 kHz.
Now I will need to build a transmitter, I will most probably go the way Joachim proposed, using a 27 MHz crystal on the fundamental frequency (9 MHz), then dividing by 9 with a 4017, then by 2 with a flip-flop, followed by a "buffer amplifier" , and later an IRF510 as power amplifier.
The hard part will be the antenna, it needs to be compact, so a "magnetic loop" is probably the only way to go here.
5000km+ TEP opening on the 432 MHz band in the Indian Ocean - 23rd Apr 2024
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Back on the 8th of April 2024, I reported on the very first
Trans-Equatorial Propagation (TEP) opening on the 144 MHz band from UAE to
Reunion Island in...
44 minutes ago
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