[R-390] Filter Bandwidth Question

[Bob Young]

I'm pretty sure that at least the .1 position is crystal, I think the 1 khz position is too, aren't there only four mechanical filters in those? I have a Capeheart too, nice radio.

Bob Young
kb1okl

________________________________
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on behalf of Ed G <ed.n3cw at gmail.com>
Sent: Monday, May 11, 2020 4:59 PM
To: r-390 at mailman.qth.net <r-390 at mailman.qth.net>
Subject: [R-390] Filter Bandwidth Question

Hi Folks,
     My Capehart 390A is working mostly FB, but I do notice what would appear to be filter loss when I switch down to the .1 filter bandwidth.  All other filter positions seem to be fine with no difference in signal/S-meter readings when going from 16 KC down to 1 KC.  But when I go to .1 KC signal level does drop down noticeably. I thought the 1 and .1 positions used the same mechanical filter, so perhaps the problem is something else (load resistor)?  Any suggestions on what to check?  Thanks!
--Ed—


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