There is a table of “first guess” filter gain
settings that Elecraft uses for factory-built units in the K3 Utility Help on
the Crystal Filter configuration page. The 400 Hz 8-pole filter has 7 dB
of gain in that table.
After starting with these approximate values, you might measure
the AF voltage at the speaker, perhaps with the alternate VFO B display
function “AFV” described on page 36 of the owner’s manual to
display the AF voltage and set the filter gain settings so that the AF voltage
stays relatively constant as you change bandwidth when tuned to a steady
carrier (perhaps generated by a signal generator). You could also clip a
voltmeter across the speaker leads. Some just do this aurally.
Dick, K6KR
From:
[hidden email] [mailto:[hidden email]] On
Behalf Of wa6riv
Sent: Monday, October 13, 2008 1:08 PM
To: [hidden email]
Subject: [Elecraft] [K3] FLx GN Adding Db gain
FLx GN
I've
bought a 400hz eight pole CW filter. Although the manual recommends 1-2
db for a setting, I see that the adjustment can be higher. What setting are
most CW operator using? I can't tell that there is an improvement. Ted [hidden email]
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