[Elecraft] ALC control of W6PQL amp from my K3

[Bob McGraw K4TAX]

And with my P3 or SDR when one closely examines a signal, the evidence of improper ALC usage or ALC overshoot is very prominent with many signals. 

The sad thing is that it can be corrected with proper settings and usage.  There is no need to occupy 10kHz of the band. And just listening to a signal usually doesn't disclose this nasty artifact. 

Bob, K4TAX


Sent from my iPhone

> On Mar 10, 2019, at 2:02 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
>> On 3/10/2019 11:34 AM, John Simmons wrote:
>> Once I got my LP100, I began to see the same behavior with my K3. This type of output anomaly is a huge reason to use ALC. 
> 
> I've had an LP100 in line for several years, always set to read peak power, and the most overshoot I've seen from either of my two K3s is less than 1 dB. The K3s are driving a pair of 87As, and I have NEVER used ALC between rig and amp.
> 
> The earliest advice I've seen about this was in the user manual for the Ten Tec Titan 425, designed around 1979, and using a pair of the same 3CX8007 triodes used in the 87A. The manual said that ALC output was provided only for historical reasons, and advised against using it to control output power.
> 
> When you look ONLY at output power, you miss the mess that ALC causes. To see it, you must look at (or listen to) the transmitted frequency spectrum. A P3 on a second radio, or an SDR receiver will clearly reveal the splatter and clicks.
> 
> 73, Jim K9YC
> 
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