Topband: Ticked over intentional interference on top band

[Shoppa, Tim]

> Jack's keying may well be a tad on the hard side, but his signal HARDLY
> emits "...key clicks out to over 1 KHz from his carrier frequency",
> IMHO...and I've copied him at some 30 db.+ over S-9 here, too, so if
> he was, indeed, "clicky", I think I'd know...

Many receivers (I try to indict DSP rigs below but really pure analog mulitconversion receivers can show this too) can have AGC pumping causing perceived clicks, especially when the incoming signal is in the roofing filter's passband but outside the later tighter filters passband.

If everything inside the AGC chain were perfectly linear you'd think this could be remedied by going to slow AGC, but no, for very loud signals with most AGC chains there is still a fast response/decay component even at slow AGC settings.

Turning RF gain down all the way helps. Attenuator helps. Turning off AGC helps.

Someday they will do a good job putting forward AGC into DSP radios. I swear that almost all the parts are in a DSP radio already.

Tim N3QE