[Elecraft] ALC implementation

[Dr. William J. Schmidt]

It's very nature causes the resulting overall transfer function to become non-linear, leading to distortion and other unwanted by products when active.



-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Brian Denley
Sent: Friday, June 28, 2019 1:38 PM
To: Jim Rhodes <jim at rhodesend.net>
Cc: elecraft at mailman.qth.net; Andy Durbin <a.durbin at msn.com>
Subject: Re: [Elecraft] ALC implementation

I have always thought that ALC is not appropriate for power control.  It’s a protection system.  Over use of ALC acts like compression.  No?

Brian
KB1VBF
Sent from my iPad

> On Jun 28, 2019, at 1:11 PM, Jim Rhodes <jim at rhodesend.net> wrote:
> 
> Yes Andy, I used a TS590 at field day. But this is the Elecraft reflector.
> These rigs work differently. Use my K3 for FT8 often. I built an 
> interface for my Kenwood rig too. But you treat them differently.
> 
> Jim Rhodes
> K0XU
> 
>> On Fri, Jun 28, 2019, 11:21 Andy Durbin <a.durbin at msn.com> wrote:
>> 
>> I strongly disagree that ALC should be zero for FT8 but that is based 
>> only on my experience with the TS-590S.
>> 
>> My draft paper on FT8 harmonics can be found here -
>> 
>> 
>> https://www.dropbox.com/s/85aoc937kz235iq/FT8%20audio%20harmonics%20d
>> raft%20d%20k3wyc.pdf?dl=0
>> 
>> ALC must be in the control range for closed loop power control to 
>> work on a TS-590. Operating in the normal ALC range with a TS-590 
>> does not degrade the F8 signal.
>> 
>> 73,
>> Andy k3wyc
>> 
>> 
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