[Elecraft] [K3] FLx GN Adding Db gain

[Dick Dievendorff]

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: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of wa6riv
Sent: Monday, October 13, 2008 1:08 PM
To: elecraft at mailman.qth.net
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
Wa6riv at aol.com

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