[Elecraft] K3 Filter Gain question.

[Bill W4ZV]

John Ronan wrote:
> 
> 
> #2184 was recently fitted with a sub receiver (very nice). It occured  
> to me that I never sat down to figure out how best to set the gain  
> figures for the filters. I have
> Main:
> KFL3B-FM
> KFL3A-6K
> KFL3A-2.7K (-77)
> KFL3A-500 (-73)
> 
> Sub:
> KFL3A-2.7K (-76)
> KFL3A-500 (-75)
> 
> The handbook suggests 1-2db for 500Hz, and I've seen posts warning  
> against using excessive gain. Any suggestions?
> 
> Also, using diversity receive on the same antenna, the signal seems  
> to 'move' slightly more than once per second between my headphones.   
> I assume this is a feature of diversity and the different signal  
> paths through the radio, as I've never had a radio with diversity  
> receive before.
> 

Regarding gain, although the actual insertion loss for 500 Hz filters is
more than 1-2 dB, but I would follow Elecraft's recommendation.  I
previously set mine to the actual loss (5-6 dB) but have since backed off to
0 dB after reading some comments by Lyle and Wayne (which cautioned about
other problems induced by gain being too high).

Regarding the warbling sound you're hearing in diversity, it's because your
filters are set to different offsets.  In your case you should set both 500s
to -0.74 and both 2.7ks to the same (either -0.76 or -0.77).

73,  Bill

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