"Michael Black" wrote in message
...
"Stefan Wolfe" ) writes:
"Stefan Wolfe" wrote in message
...
You use it to transmit from
your serial port directly to the AM commercial band (10000 Khs) and the
other side listens on a commerical AM radio.
http://sci-toys.com/scitoys/scitoys/...ansmitter.html
Whoops, typo....S/B 1000Khz.


And wouldn't it be A2? Or have they tossed out that designation?

A2 was/is an audio tone into an AM transmitter.

I think in this circuit pin 4 of the serial port connects to the power input
of the oscillator cihip. The oscillator 1MHz "carrier" is truely keyed on
and off, thus it is A1A.