|[AMRadio] Odd signals in lower 80 meters|
k4kyv at charter.net
Fri Dec 22 22:49:54 EST 2006
If it is a simple scrambling system that works by inverting the audio -
making the lower frequencies come out high and vice versa, they could
easily be decoded by copying as SSB in the opposite sideband position and
offsetting the carrier frequency by whatever the tone frequency in the
inverter is. When copying in the opposite sideband, that is exactly what
happens - the lower frequencies come out the highest and vice versa. The
audio inverter scramblers were designed for landline telephone use, and
maybe for AM or FM radio use.
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