[Elecraft] Low SubRX audio below 20m

[nekvtster at gmail.com]

On 30m and below, the sub RX audio is much lower in level than the main RX.  
I am set up to use the "SUB" audio control as the "balance" control between  
the main and SubRX audio levels (SPKRS: 2, SPKR+PH: no, SUB AF: balance).  
Both receivers get their RF from the main antenna. On 20m and above, this  
works fine - adjusting the control to the 12 o'clock position "centers" the  
stereo audio image between the two speakers. On 30m and below, however, the  
sub RX audio is much lower - the "balance" control is at about 3 o'clock  
(ie, injecting a much smaller amount of main RX audio) to "center" the  
stereo image. Thus, I have to "ride" this control when changing bands.

I am using the latest "public" firmware revision, but I believe I have had  
this problem for some time. I did purchase "matched" filters for the main  
and sub RX's, and I have re-checked to ensure that they are set up with the  
same parameters. The state of the AFX control has no perceptible effect and  
I see that AF GAIN and AF LIM cannot be set differently for main and sub RX.

Any thoughts on what is causing this? I don't see any previous mention in  
the reflector archives.

Brian K1LI K3 #2435 -- K2 #2070 -- K1 #270