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

[Jim Brown]

On 8/28/2019 1:50 PM, Wes wrote:
> With my SDR-IQ looking at the K3S i-f output I can see the other guy's 
> signature.  I suppose a P3 does the same.  It's pretty amazing to see 
> some of the lousy signals when we have such improved technology.

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