Subject: KAM TNC birdie fix at 145.610

The following KAM birdie fix is from  N1MEN DE Mark and eliminates the
unsquelchable noise at 145.610.

In ALL KAMs (not the KPC3 or others), there is a cap on the
motherboard that is designated C49. It is in the left front
side of the board if the boards front panel is facing you. The
cap is located next to a small crystal. It is clearly marked on
the motherboard C49. The value of this cap, depending on the age
of your KAM can be either .27 picofarads or .33 picofarads. The
original KAMS had the .27 and the latter had an updated .33 cap
installed instead. The .33 was "supposed" to cure the birdie
problem, but usually didn't.

The fix is to remove the .27 or .33 pf cap and replace it with
either a 8-50 pf variable (I didn't have one and couldn't find one),
or replace it with a value of cap other than the .27-.33 in your KAM.

If you use a variable, then just tweak it until the birdie disappears.
If you opt for the fixed value cap, experiment until the birdie flies
away. This fix does NOT apply to KPC-3's. This fix will not affect
internal clock speeds.


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