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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of wa6riv Sent: Monday, October 13, 2008 1:08 PM To: [email protected] 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 [EMAIL PROTECTED]
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