[Elecraft] K3 - Volume loss through filter???

[Jack Berry]

Is the pre-amp in the same state for both receivers?




________________________________
From: Al Dynarski <adynarski at casperkoa.com>
To: elecraft at mailman.qth.net
Sent: Fri, February 3, 2012 12:05:12 PM
Subject: [Elecraft] K3 - Volume loss through filter???

I recently installed the sub-receiver in my K3 and when comparing the filter 
performance between the two I realized that I have a
problem with one of the filters in the main receiver.  All filters are 8-pole 
and each receiver has a 2.8khz, 1.8khz and 250hz
filter.  The filter configuration is exactly the same for both receivers.  



Listening to the sub-receiver and narrowing with the Width control I can hear 
the change as I pass from filter to filter and the
volume stays the same for each filter.  However on the main receiver as I pass 
from to 2.8khz  to the 1.8khz, the volume drops by
about 2/3 and as I pass from the 1.8khz to the 250hz, the volume returns to the 
same level as the 2.8khz filter.  I suspect that
either the 1.8khz filter has a problem or I may have a problem with dirty 
contacts.



Before I open up the radio and try swapping the 1.8khz filters to see if the 
problem follows the filter, I wanted to be sure I was
not missing some other cause or configuration issue. Any comments would be 
appreciated.



Thanks,

Al  W7SYK







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