Re: Nulling QRM

Posted by AD6XY on
URL: http://elecraft.85.s1.nabble.com/Nulling-QRM-tp3572519p3573157.html

Thanks Guy

Yes the latter was what I was wondering too - and even if you could use the 2nd RX to determine the metrics for the DSP in the main RX. For example, centre the sub RX on the unwanted signal, or use a wide filter on the sub RX to get sample the splatter. Model this to generate an inverse splatter function and subtract it from the main receiver samples to get just the wanted signal. Far too difficult I suspect but if you could do it you would sell a lot of receivers.

Mike


"It's pretty impressive what the K3 does with no more smarts than bandwidth and not driving the hardware IF into hardware AGC.

It's what's left after the above (splatter, next door neighbor up 5 khz, etc) that's interesting.  Does a splattering signal have a signature in the complex waveform that will allow it to be nulled to some degree? I'm sure that Lyle has a permanent inventor's agenda on that problem.
"