[Elecraft] K3 - SPE Expert 1K-FA and ALC

[juergen]

Hi Vic

Yup, ALC is  not feedforward correction system. It is a servo like mechanism that corrects after the  distortion has left, then it corrects. For SSB splatter this is a disaster which we dont need. 

The worst example of this is the Yaesu Quadra, it is the worst buckshot generator on the bands. The Quadra when used with ALC is an horrendous splatter generator.

Closing the stable door after the horse has bolted, is not good amateur practice. Having the horse bolt several hundred times during  a QSO is not pleasant for others.

Feedback ALC systems dont belong in modern ham equipment. All Japanese transceivers have ALC overshoot issues. We need to get back to the transmitter gain or drive adjustments that set the drive power precisely with no overshoot. Its a nice dream that does not exist in modern ham transceiver.  Most commercial and mil SSB equipment have a drive or TGA(transmitter gain adjustment) knob.

John

--- On Sat, 5/15/10, Vic K2VCO <vic at rakefet.com> wrote:

> From: Vic K2VCO <vic at rakefet.com>
> Subject: Re: [Elecraft] K3 - SPE Expert 1K-FA and ALC
> To: "David M. Elliott" <immondizia at earthlink.net>
> Cc: elecraft at mailman.qth.net
> Date: Saturday, May 15, 2010, 3:56 PM
> Any time the gain of the system
> changes, there's distortion. In SSB mode, I would expect 
> it to occur when the ALC voltage changes, such as at the
> beginning of syllables, etc.
> 
> On 5/15/2010 3:10 PM, David M. Elliott wrote:
> > In general, I would agree with You and Guy and Vic.
> >
> > However, Gianfranco of SPE (Expert) suggests running
> the exciter at full power.  He
> > says there is no splatter and the proof of the pudding
> is in the eating.  That seems to
> > be true.  I can't see any splatter on the
> WaveNode and several on the air tests report
> > fine audio with no splatter.
> >
> > I repeat:  There is something here we don't
> understand.
> >
> > Any comment, Gianfranco?
> -- 
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
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