[ARC5] Frequency shift with percussion

[Kenneth G. Gordon]

Speaking of the subject:

I don't know if many remember my battle with a BC-454 which someone, 
back in the day, had begun to modify to cover the 10 meter band, but had 
never finished. However, during my work with this wreck, one of the things I 
had to overcome was severe microphonics, and severe instability.

What I eventually found was that the slugs in the coil-box were all loose and 
were literally rattling around in there.

Filling each coil form with melted bees-wax cured part of the problem.

I suppose the fact that the receiver was now operating on a frequency which 
was close to 10X the frequency it was originally designed for had a lot to do 
with the problems I experienced.

The eventual result was a receiver which covered the 10 meter band from 28 
to 30 MHz, with good sensitivity and decent stability. Selectivity was about 
what one would expect: acceptable for AM, at least.

But believe me, I would never take a decent receiver and do such damage to 
it.

Ken W7EKB