I haven’t tried this yet specifically to see if it can outwit the AGC, but it
is often useful to flip to CW reverse to get the QRMer on the other side of the
skirt.
But during a contest, like this past weekend, when no-one is supposed to be
operating split, I don’t know how much an S&P station can do to dig under
strong callers who are spot on the target.
Ted, KN1CBR
------------------------------
Message: 12
Date: Tue, 21 Feb 2017 09:48:51 -0500
From: Don Wilhelm <donw...@embarqmail.com>
To: W0MU Mike Fatchett <w...@w0mu.com>, Elecraft Reflector
<elecraft@mailman.qth.net>
Subject: Re: [Elecraft] K3 Receiver mush
Message-ID: <80c5f984-1f08-126b-524d-0042e84f0...@embarqmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
Mike,
Think about it - if there are multiple signals in the passband, the AGC
will respond to the strongest, there is just no way around that fact.
If the signals can be separated by the DSP, and one is really strong,
that strong station may be activating the Hardware AGC. The only
solution for the latter is a more narrow roofing filter - put the
offending strong signal out of the passband of the roofing filter and
use shift to get your sidetone for the desired signal back in order.
That may be too much "fiddling" for a run station in a contest, but it
is a viable way to operate when trying to copy a weak station working
close to a strong station.
73,
Don W3FPR
On 2/21/2017 9:25 AM, W0MU Mike Fatchett wrote:
> We noticed again during the contest hat when 3 or 4 stations called, all
> those signals would be flattened to the same level. Once you got to
> where one or two stations were calling the signal level would pop up
> substantially.
>
> I have played endlessly with slope and threshold with little effect.
>
> My K3 has the new syn boards as well and filters from 2.8 to 2.5.
> Latest firmware etc.
>
------------------------------
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