[80m] Identical Noise???

Sat, 1 Feb 2003 07:26:11 -0500

Stan & Merv;

Many serious multi- multi contest stations have implemented the use of
the MFJ-1025 or 1026 to reduce noise on the low bands. From what I read,
in a nutshell, it enables one to phase out the noise.
Check out their site and read the manual for free.

73,

Jim Miller, K4SQR
http://www.comteksystems.com
4-Square Experts, Stack Yagi
& Remote Antenna Switching Systems

On Fri, 31 Jan 2003 21:54:06 -0500 "Stan Dicks" <[email protected]>
writes:
> 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
> 
> 
> 
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
>   text/plain (text body -- kept)
>   text/html
> The reason this message is shown is because the post was in HTML
> or had an attachment.  Attachments are not allowed.  To learn how
> to post in Plain-Text go to: http://www.expita.com/nomime.html  ---
> _______________________________________________
> 80m mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/80m
> 
> 
> _______________________________________________
> 80m mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/80m
> 
> 