[Elecraft] K3--Too much ALC creates energy on opposite sideband?

[Bob McGraw K4TAX]

I find a lot of the opposite sideband splatter is originated from 
mis-tuned amplifiers or amplifiers which are driven too hard.   If it 
isn't "linear" it is a splatter generator.    And linear means just 
that, linear.  For an amp to be linear, it must amplify all signal 
levels the same amount.  Most amplifiers begin to show some degree of 
signal compression at the upper power rating limits. Pushing one past 
these limits even the slightest amount, generate significant amounts of 
opposite sideband splatter.

73

Bob, K4TAX


On 8/28/2019 4:27 PM, Jim Brown wrote:
> On 8/28/2019 1:50 PM, Wes wrote:
>
> Yes. I regularly see signals from SSB ragchewers with splatter in the 
> suppressed sideband only 10-15 dB below signal in the intentional 
> sideband. The data in the link I posted was with a P3 on my second K3, 
> with the K3 being measured into a dummy load.
>
> I've alerted guys on 6M about this, suggesting they turn down drive to 
> their amplifier, and they said they didn't have an amplifier. When I 
> asked what rig, it was one of the low-cost do-everything rigs from one 
> of the big JA mfrs. When I posted this at the time, W4TV described the 
> mechanism (I think I remember that it was a shortcominBefore Elecraft 
> rigs took over Field Day, These cheap rigs (and even some much more 
> expensive ones) have long been considered the scourge of Field Day.
>
> 73, Jim K9YC
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