On Friday 01 July 2005 04:56 am, Mike Morris WA6ILQ wrote:
> One trick that I have used... the "far end" of the
> preselector tune broader than the "near end". I've found
> that I get better performance if I do the tuning then
> turn it around and tune it again. This lets the old "far
> end" adjustments become the "near end" for the second
> pass through the procedure.
I have read that somewhere (or quite possibly I remember you
having said it before!) I did try this a couple of times.
> Put a test receiver on the spur frequency, and if the
> test receiver desenses due to the true frequency then add
> a cavity in line to knock down the true frequency. Then
> go poking around in the exciter and see if you can
> isolate it to one stage. I'll bet that you find a
> multiplier that a slight touch in the adjustment kills
> the spur.
I have done that. Unfortunately I can tune each stage as
far as I want (up to the point - in either direction - that
it kills the whole transmitter) and it makes no real change
in the spur.
Paul N1BUG
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