[Elecraft] K3 Receiver Mush

[Dauer, Edward]

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

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    Message: 12
    Date: Tue, 21 Feb 2017 09:48:51 -0500
    From: Don Wilhelm <donwilh at embarqmail.com>
    To: W0MU Mike Fatchett <w0mu at w0mu.com>,	Elecraft Reflector
    	<elecraft at mailman.qth.net>
    Subject: Re: [Elecraft] K3 Receiver mush
    Message-ID: <80c5f984-1f08-126b-524d-0042e84f0248 at 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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