[Milsurplus] Noise question, not too far off topic.

[radioman390 at cs.com]

 There was a unit made at one time which would receive the noise separately from your receiver (even with a separate antenna as I recall, put it out of phase, and mix it with the signal from your main antenna, so as to cancel out the noise before it went into your receiver,? but not the main signal, only the noise. I think it could only handle one noise source.

But my memory is vague; you should do some research.

 



-----Original Message-----
From: Mack Rogers <n4vgb at yahoo.com>
To: Milsurplus <Milsurplus at mailman.qth.net>
Sent: Tue, Nov 16, 2010 4:19 pm
Subject: Re: [Milsurplus] Noise question, not too far off topic.

 
 
 
That doesn't sound like a very sincere response from your local AC power  
distributor. Then there's the problem of whether most of the offending noise is  
getting into your receivers directly through the air or via the AC line that  
powers you receivers. Surplus AC line filters show up at hamfests all the time  
and are a good investment. Most of these have a good choke & capacitor  
arrangement that will kill quite a bit of AC line noise. If you've got a well  
stocked junk box or two the pieces needed to build one are probably already in  
your possession. 
 
good luck 
 
 
N4VGB 
Mack Rogers 
 
 
 
      
 
--- On Tue, 11/16/10, Jack Antonio <scr287 at att.net> wrote: 
 
> From: Jack Antonio <scr287 at att.net> 
> Subject: [Milsurplus] Noise question, not too far off topic. 
> To: Milsurplus at mailman.qth.net 
> Date: Tuesday, November 16, 2010, 11:31 AM 
>  
> I've been dealing with line noise here at my new QTH, 
> which 
> has been keeping me off AM.? Since a? lot of my 
> receivers do 
> not have a noise limiter, it is really a bother. Noise 
> limiters do 
> make the noise slightly less annoying, and a blanker 
> punches a 
> hole in the carrier, which is just as annoying as the noise 
> itself. 
>  
> I DF'ed the area it is coming from, reported it, and the 
> power company 
> said they found bad lightning arresters and cracked 
> insulators.? They 
> will repair it (hopefully pretty soon), but told me it is 
> an ongoing problem 
> in this area. 
>  
> So, the question is... 
>  
> Does anyone have any experience with something like an MFJ 
> DSP 
> unit as an outboard unit following a BC-348 or similar 
> receiver, in cleaning 
> up line noise.? The noise waveform itself? is a 
> sharp spike. 
>  
>  
> Thanks 
>  
> Jack Antonio WA7DIA/4 
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