[Elecraft] KSB2 ALC question

[Don Wilhelm]

Adam,

I suspect that the USB BFO is set too close to the filter skirt for your
FL2/FL3 and allowing some BFO energy to leak through the filter.

Since you just finished the SSB option, go ahead and set the SSB filters up
with Spectrogram and wideband noise, then if the problem is still present we
can look for some other cause.

73,
Don W3FPR

----- Original Message -----
From: <akern@haverford.edu>
To: <elecraft@mailman.qth.net>
Sent: Sunday, July 06, 2003 11:48 PM
Subject: [Elecraft] KSB2 ALC question


> Just installed the KSB2 module into K2 S/N 3547 and got it up and
> running.  I notice that when on USB with the ALC enabled the S-meter
> registers one or two LED's and the receive audio seems slightly
> attenuated.  Switching to LSB or CW returns reception to normal insofar
> as the ALC is concerned.  After experimentation (all the while with the
> antenna disconnected) I discovered that, under any circumstances, turning
> off ALC solves the problem while in USB mode.  Interestingly, the ALC
> triggers only when I have FL2 (OP1) or FL3 (1.8 kHz) enabled.  When I use
> FL1 (i.e. the SSB transmit filter) for receive the ALC behaves normally
> regardless of its setting.  When I connect the antenna I can certainly
> copy signals and make QSO's in USB using any of the filters, it's just
> that the receive audio gets attenuated due to ALC response with FL2/3.
> Any ideas?
>