At 15:26 01/02/2000 +0000, you wrote:
I would guess that the sidebands are due to power supply ripple,
and that when FSK modulation is on, all the sidebands get
modulated too. Since the data is probably not syncronised with the
mains, the end result is the amazing racket we are used to.
From the symptoms you describe, I agree with your diagnosis.
It is definitely a power supply problem, possibly caused by
faulty filter capacitors.
73
Costas
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