[Elecraft] K1-4 receiver sensitivity problem

[ac7a@gci-net.com]

Hello,

I am in the process of assembling a 4-band, K1 transceiver,
and have ran into a bit of a problem with the receiver
performance. This has been observed at the receiver
alignment procedure. 

The problem is very poor receiver sensitivity. In fact,
only the strongest of signals can be detected. This is the
case on all bands. The audio gain is very good, so it looks
like a RF or IF signal problem.

A possible hint: The pre-mix band-pass filters all peaked
the receiver gain. The trimmers in the receiver side of the
RF band-pass filter (CA, CC, CE, and CG) peaked the gain as
well. However, the corresponding filter trimmers CB, CD,
CF, and CH, all behaved as though there wasn�t a peak.
These trimmers are on the T/R, antenna path side of the
filter.

Can anyone tell me if CB through CH exhibit broad peaks
that don�t seem to affect the gain very much? 

I am interested in any other ideas you may have with regard
to the sensitivity problem as well.

Thanks, Thomas � AC7A (Tucson)