[Elecraft] What happened to ALC?

[Walter Underwood]

ALC is supposed to be linear, non-distorting. Change the level without changing the waveform.

Compression is non-linear and changes (distorts) the waveform.

I’ve read that the K3 uses RF limiting at the first IF for compression. If so, the ALC would be before the modulator and compression after it.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 31, 2022, at 5:32 AM, Bob Schwerdlin <WG9L at comcast.net> wrote:
> 
> I agree.  From one old sound engineer to another... I see this as audio compression.
> 
> Bob, WG9L
> 
> On 1/30/2022 6:17 PM, ws6x.ars at gmail.com wrote:
>> -----Original Message-----
>> From: elecraft-bounces at mailman.qth.net On Behalf Of Fred Jensen
>> Sent: Sunday, January 30, 2022 4:10 PM
>> To: Elecraft Reflector <elecraft at mailman.qth.net>
>> Subject: [Elecraft] What happened to ALC?
>> 
>> I can remember, shortly after SSB appeared on the ham bands that "ALC"
>> showed up and was immediately inducted into that top category of things like canned beer and sliced bread.  It would reduce the dynamic range of your signal and fill out your RF envelope...
>> Maybe I'm not well-versed in today's whiz-bang technology, but to this old sound engineer this sounds suspiciously like compression.
>> Jim - WS6X
>> 
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