[Premium-Rx] interference caused by tv sets

[Carcia, Frank A. HS]

    Gary,
    You remind me of Motorola Days. We had the same problem
    with a crap switcher under light load in RX and solved it the same way.
    TV rots your mind.  fc

-----Original Message-----
From: Gary Geissinger [mailto:ggeissinger at digitalglobe.com]
Sent: Tuesday, May 20, 2003 3:00 PM
To: premium-rx at ml.skirrow.org
Subject: RE: [Premium-Rx] interference caused by tv sets



Guys, 

I had this sort of problem with my computer CRT monitors.  I bought LCD
monitors and the problem GOT WORSE. 

It turns out that the little outboard switching power supplies that came
with them were horrible and generated all kinds of interference.

I threw them out and now I run the screens off my Astron linear 13.8 VDC
supply. 

In that configuration all is quiet on the interference front...as long as I
keep my TV turned off.  By the way, keeping the TV off solves the
interference problem caused by my ham radio linear too!

Gary WA0SPM 

-----Original Message----- 
From: Carcia, Frank A. HS [ mailto:francis.carcia at hs.utc.com
<mailto:francis.carcia at hs.utc.com> ] 
Sent: Tuesday, May 20, 2003 12:44 PM 
To: 'Greg W. Bailey'; GandalfG8 at aol.com; premium-rx at ml.skirrow.org 
Subject: RE: [Premium-Rx] interference caused by tv sets 


Snap some magic beads on the power and cable lines 
and maybe you can reduce the conducted emissions 
that later radiate. Might help.   fc 

-----Original Message----- 
From: Greg W. Bailey [ mailto:gbailey at mail.sdsu.edu
<mailto:gbailey at mail.sdsu.edu> ] 
Sent: Tuesday, May 20, 2003 2:39 PM 
To: GandalfG8 at aol.com; premium-rx at ml.skirrow.org 
Subject: Re: [Premium-Rx] interference caused by tv sets 


You beat me to it Nigel-  I know it isn't the answer Herb wanted to read, 
but......  turning off the TV is an answer. 

To assist Herb, I find my biggest nose generator is the FAX machine.  It 
generates a bursts about every 70 KHz all the way from 1.5 to 35+ MHz.  I am

assuming it is the fast risetime of the uProcessor's data lines that is the 
cause?  My fix is simple, basically, if you want to FAX me, call ahead and I

will turn it on. 

With the application of more dedicated uProcessors in everything from 
refrigerators to perhaps the common tooth brush, this problem is going to 
get ugly in the future.  Further, while Herb can turn off the TV, 
discontinuing the operation of the family refrigerator is not an option. 
I'll put money on the fact that most of our membership already has the 
problem in one form or another. 

Herb, let us know if you find a solution, I got this feeling this is a topic

that will be revisited. 

Greg 



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