[80m] Identical Noise???

Fri, 31 Jan 2003 21:54:06 -0500

Merv,

Joe, K3RR has been working on just that kind of set-up, using
some old Collins receivers. So far, he hasn't been successful,
but he's still experimenting. I have seen such cancellation using
one of the boxes designed to eliminate electrical noise, such as
the JPS ANC-4. I've also succeeded a couple times mixing slightly
different frequencies using dual receive on the IC-775 and IC-756P2
in eliminating almost all of the noise. Of course, a big problem
is shifting the noise 180 but not the desired signal, which means
you almost have to have some dsp or some processing of some kind
involved. Some day we will figure out how to listen to signals
with no noise on 160M and 80M (or maybe not).

73,
Stan, W4AG

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Merv Stump
Sent: Friday, January 31, 2003 4:05 PM
To: 80Meter
Subject: [80m] Identical Noise???

Is the atmospheric noise on one frequency identical to the atmospheric
noise on a nearby frequency?  

Assume that I am listening to a weak dx signal on 3.795 which is pretty
much buried in the atmospheric noise.  Further assume that 3.805 is a
clear frequency, but with the same noise.  If the noise on the two
frequencies is identical could I shift the phase of the 3.805 noise 180
degrees and use that to cancel the noise I am hearing on  on 3.795?

Thoughts?  Anyone know why it won't work?  Anything that already works
that way?

Merv, W2OE

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