[R-390] 4kc filter repair?
D. ball
[email protected]
Thu, 08 Apr 2004 16:50:54 -0400
Has anyone rebuilt a 4kc filter before? I have been trouble shooting mine
and have found it to have about a 10s-unit difference on the s-meter and
about the same drop measured from the IF out using a spectrum analyzer. The
signal to noise is slightly worse than the others. I have also noticed a
.5db ripple across the top of the band pass on that filter. I do not notice
this on the other filters. I also read the same 50ohms across the internal
coils on all four filters. I supect that the foam inside the filter is bad
because the filter seems to have a muted tone to it. I have the proper
re-work tools to dissasemble the filter, clean it, and sweep it on a VNA
once done. I am wondering if anyone has tried this and if so any tips?
thanks
joe
KE1MB
[email protected]
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