[Elecraft] DSP noise solution unlock during transmit? Was Re: sigmoidal keying mod

Wed Mar 24 20:44:06 2004

Perhaps the answer would be to "freeze" the DSP in place while
transmitting, rather than letting it "digest" silence for the baud.
Likely the dynamic parameters to solve the noise for the time just
before the baud are a better guess than those derived from silence for
the time right after the baud. Perhaps the program would need to go
into a state where the solution parameters are held for the onset of
receive, rather than allowed to decay.

Guy.

----- Original Message ----- 
From: "Vic Rosenthal" <[email protected]>
To: "Guy Olinger, K2AV" <[email protected]>
Cc: "Brendan Minish" <[email protected]>; <[email protected]>
Sent: Wednesday, March 24, 2004 11:49 AM
Subject: Re: [Elecraft] Re: sigmoidal keying mod

> Guy Olinger, K2AV wrote:
>
> > Is the burst because the AGC discharges during the baud and must
> > recharge at keyup? Or the DSP unlocks from it's solution to the
noise
> > "problem" while the RX is muted and must resynch itself to the
problem
> > at keyup?
>
> I think it's the latter.  I think it only occurs when the DSP is
> removing a lot of noise.  I can't think of an easy solution, other
than
> turning off the denoiser.
>
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
>
>
>