[Ham-Computers] hash w/o the corned beef

[Duane Fischer, W8DBF]

Biased comment:

Phil Atchley is one of the brightest and most talented repair tech's I have 
ever encountered.
Duane Fischer, W8DBF
dfischer at usol.com
HHI: Halligan's Hallicrafters International
http://www.w9wze.net
HHRP: Historic Halligan Radio Project
http://hhrp.w9wze.net

----- Original Message ----- 
From: "Philip" <ndb_fch-344 at sbcglobal.net>
To: "Computers (or other) used for amateur radio, communications, or 
experimenting" <ham-computers at mailman.qth.net>
Sent: Monday, January 22, 2007 5:33 PM
Subject: Re: [Ham-Computers] hash w/o the corned beef


> Jeff,
>
> My experience here has shown that this interference typically comes from 
> two sources.  The computer power supply and the monitor itself, with some 
> noise occasionally being radiated by the mouse cord etc.  On my last 
> computer, (a 600MHz P3) some noise was radiated around 7MC by the mouse 
> cord whenever I moved the mouse. The mouse also got QRM'd sometimes when I 
> transmitted on 40M, doing strange things to the cursor.  Ferrites didn't 
> help, I just lived with it.  The new 3.4GHz P4 machine is very quiet, RF 
> wise.  It's well shielded and has an RF quiet power supply.  The old HP 
> CRT monitor was well shielded and only radiated a little.
>
> When I had to replace that monitor I found that ALL the new CRT monitors 
> that I tried out were TERRIBLE, and they went back to the store! 
> Apparently they no longer bother to shield them any. The answer was to buy 
> a nice ViewSonic  LCD flat-screen monitor with INTERNAL power supply (I 
> finally took a portable radio to the dealer).  It is VERY quiet, RF wise. 
> The only radio that hears any QRM is the AM portable that I listen to Rush 
> on, and that's because it and it's internal ferrite antenna is only a 
> couple feet from the monitor.
>
> NOTE:  NOT all LCD monitors are as quiet as this one.  The "Generic" one 
> that came with the new computer has an external switching PS that does 
> create a few "Birdies", but not excessively so.  I let the wife use it 
> with the old 600MHz P3 for her Email.  But if the need ever arose I 
> wouldn't be averse to putting it here in the radio room.
>
> 73 de Phil,  KO6BB
> DX begins at the noise floor!
>
> THE BEACONEER'S LAIR:   http://www.geocities.com/ko6bb/
> MY RADIO-LOGS:       http://www.geocities.com/ko6bb/Logs/
> QSL GALLERY: http://photobucket.com/albums/f306/KO6BB/
> Merced, Central California,    37.3N  120.48W  CM97sh
>
>
>> My computers are wreaking havoc upon my radios.
>>
>> I just tried putting some ferrite donuts around the power cords,
>> resulting in a zero db reduction.  I might as well have eaten them.  I
>> have an indoor loop and outdoor antenna; switching makes no difference.
>>
>> I'm going to try reorienting them, but what other practical solutions
>> are there?  I'm not limited to one room, but since I spend a lot of time
>> there, I'd prefer to have radios and computers both in the room.
>>
>> Face it - it would be pretty silly to try tuning a radio in the next
>> room.
>>
>>
>>
>> Thanks,
>> jeff
>
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