One could couple into a crystal oscillator NAA's signal and then listen 15
kHz to the side of the oscillator's frequency for great CW practice. BIG
signal. 73 Mac N8TT

--
J. Mc Laughlin; Michigan U.S.A.
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"Fred W4JLE" wrote in message
...
As I remember, we used 18 Kc and 13 Kc. We didn't have hertz in those days
:)

We were able to copy Jim Creek when submerged in the Red Sea. Jim Creek
had
13 miles of wire suspended between two mountains in what was probably the
worlds biggest capacitance hat.

All CW , because even a 150 cycle shift for rtty would have thrown the
tank
circuit out of resonance. Now no one would be able to copy it...