[R-390] dB loss when switching filters Problem solved!

[Gene Dathe]

Well, I set up the signal generator and was getting going, had the rig 
warming up, ready to go, took the cover off the filters, and PROBLEM 
DISAPPEARED!  I found that when the nut on the cover was not tight, no 
problem, but when hand tightened that last half turn, suddenly output 
dropped.

Inside the cover I can see scratches where the cover contacts the leads that 
extend downward from the variable caps, where the mica caps are soldered on. 
  Alternatively, perhaps the bundle of wires that are down on the bottom are 
being pinched when tighten fully.

I removed some metal on the bottom of the cover to avoid any possible pinch 
point, then used some 3M heat tape to wrap around the exposed solder joints 
up top.  Game over!  Cover back on, will be enjoying the MN Twins tonight 
with the 8kc filter, sounds like your right in the Metrodome....

THANK YOU  to all of you that responded for you helpful hints.

73 de NAØG, Gene

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