[Elecraft] ALC overshoot

ab2tc ab2tc at arrl.net
Mon Mar 29 20:29:09 EDT 2010


Hello again,

Let's all agree that the undershoot problem is not huge. But it's much more
than 20% and it lasts much longer than a couple of seconds. And I object to
the notion that a properly working ALC, even a fairly fast one necessarily
leads to severe distortion or splatter. I again hold the opinion that the
real bad signals heard are due to to PAs being operated with no ALC feedback
to the exciter feeding it and operators being clueless to this. A properly
operating ALC system should be virtually impossible to talk into serious
distortion.

AB2TC - Knut
 
W8JI wrote:
> 
> 
>> An undershoot of ~ 20% for the first few seconds of 
>> transmission on a
>> new frequency might be an irritant but an overshoot or 
>> aggressive fast
>> acting ALC leads to spatter on peaks, this is very common 
>> issue on the
>> bands today
>> An undershoot of  ~20% on peaks (it's less on my K3) is 
>> negligible in
>> terms of the receiving end signal strength and a small 
>> price to pay for
>> a cleaner transmitted signal.
> 
> 
> I think overshoot on SSB is greatly overplayed in most 
> radios. There are some truly bad radios, but even in them 
> the overshoot is very short duration. It often won't even 
> <snip>
> 
> 

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