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.
Another Blast from the Past -- Dino KL0S in the early 70s -- A Turner mic,
a Vibroplex, an HQ-100, a DC receiver, and a tech library.
-
*Dino: Yes the parallels are really eerie OM. There is that Turner mic.
I still have mine too, but I had to replace the element with an Electret.
Mine ...
1 day ago
No comments:
Post a Comment