>I powered down the Mastr Pro receiver, noise still there,
>only thing left was the cat controller, powered it down and noise is
>gone. This noise was heard over a large frequency spread in the
>aircraft band on the SM. Could it be possible that the controller
>could be the cause sending havac out the band.
If it's radiating enough to get out any distance, there's something
SERIOUSLY wrong with it.
I'd consider this possible, but unlikely.
It might make it into your receiver though, if the CPU clock has the
right harmonics.
Those oscillators are nowhere near the stability of the ones that we
use for RF either, they will be FM'd by load, and what the processor
is doing at the moment..
You can probably alter the xtal frequency just a bit, enough to get
out of your receiver, but not enough to bother anything else, by
changing one of the two caps that will be located very close to the
crystal. 10-30pF normal value range. MFJ had this in one or more of
their TNCs, for the same problem.
1, 2, 4, 8, and 16 MHz are all popular uP clocks, and all have
harmonics that end up on the bottom end of the 2M band.
In the case of 1 and 2M, the harmonics would be at 144, 146, 148, and
144, 145, 146, 147, 148-ish, but I doubt the 1MHz rock would have
harmonics up that high.
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