Re: [IRCA] Computers and displays

["Tim Kridel" <tkridel@xxxxxxxxx>]

 

LCDs use fluorescent backlights, so it might be that some backlights are noisy. Just a guess.

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From: irca-bounces@xxxxxxxxxxxxxxxx [mailto:irca-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Steve Ratzlaff
Sent: Thursday, April 28, 2005 11:07 AM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] Computers and displays

Someone on another radio list recently bought an LCD display; when he got it home it wiped out reception from LF-HF--he returned it. He took along a portable radio and checked every display in the store (a Best Buys store, as I recall). I believe he only found one model that was quiet, and bought that one, and has had no noise problems with his radios. Apparently the switching power supply used in these displays is the problem. Most of the CRT displays were quiet but only one or two of the LCD displays were. Let the radio hobbyist buyer be forewarned.

For laptops, I can only comment on the couple older ones I have, plus a recently-purchased late model one--all mine are quiet for the laptops themselves, though the small switching power supplies will give off noise if you hold a radio near them, and a portable radio used in the same room with them will have a lot of high-level junk being received from LF-MF. But my outside antennas and tabletop radios are unaffected.

Steve

-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx [mailto:irca-bounces@xxxxxxxxxxxxxxxx]On Behalf Of WWWR
Sent: Thursday, April 28, 2005 1:40 AM
To: DXFlorida; IRCA; NRC
Subject: [IRCA] Computers and displays

I notice some list members apparently use computers in fairly close proximity to their receivers.  I have been wondering if LCD/flat-panel displays are less noisy than CRT display.  Also, if laptops tend to be more or less noisy than desktop computers. 

 

I'm beginning to think timed recording ability, real-time signal processing capabilities, and on-line access are worth considering the addition of a computer to my radio paraphernalia.  That raises the question of advantages between the mentioned alternatives.

 

Any thoughts would be greatly appreciated.

 

W. Curt Deegan
Boca Raton, (South East) Florida
http://ScooterHound.com/WWWR/wobbler/

 

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