After the discussion on computer noise, I was reminded
that I have a problem with noise generated by my Viewsonic crt monitor. I use my computer for logging, so it has to be on when I'm on the air. Does anyone have any ideas on how to reduce/eliminate this type of noise? I thought about making some kind of ground sheild inside the case of my monitor, but that might create a cooling problem. Ideas? 73, Mark Baugh W5EZY Grenada MS __________________________________ Yahoo! FareChase: Search multiple travel sites in one click. http://farechase.yahoo.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Mark,
The best solution that I can offer is to replace it with a TFT (LCD) monitor. Takes up a lot less space on the operating desk and does not generate so much trash in the RF spectrum. I suffered from the same thing for a long time and finally just bit the bullet and bought one - I have been very pleased. 73, Don W3FPR > -----Original Message----- > > After the discussion on computer noise, I was reminded > that I have a problem with noise generated by my > Viewsonic crt monitor. I use my computer for logging, > so it has to be on when I'm on the air. Does anyone > have any ideas on how to reduce/eliminate this type of > noise? I thought about making some kind of ground > sheild inside the case of my monitor, but that might > create a cooling problem. Ideas? > > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Hi Mark,
I have to echo W3FPR's advice. I had a Viewsonic monitor myself, and I DID shield the inside, put ferrites on the VGA input cable, put chokes, ferrites & capacitors on the AC input as well, and didn't even manage to reduce the radiated noise. I suspect it's coming from the CRT itself. You will most likely spend more money trying to fix that monitor than you would buying an already shielded one or a TFT LCD one. Personaly I like the LCD monitors (don't get a plasma screen monitor as some of them radiate worse than the viewsonic), but haven't been able to afford one yet. I'm using the Dell monitor that came with my computer, and whoever manufactures them for Dell did an excellent job of shielding this one as I don't have any noticeable radiation that I can find in any of the ham bands. There is a little garbage appearing around 12 MHz that I can attribute to the monitor, but even there it's attenuated enough that you wouldn't notice it unless the atmospheric noise was very low. Jim - W0EB > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Don Wilhelm > Sent: Monday, November 21, 2005 9:21 AM > To: Mark Baugh; Elecraft Reflector > Subject: RE: [Elecraft] Monitor Noise > > > Mark, > > The best solution that I can offer is to replace it with a > TFT (LCD) monitor. Takes up a lot less space on the > operating desk and does not generate so much trash in the RF > spectrum. I suffered from the same thing for a long time and > finally just bit the bullet and bought one - I have been very pleased. > > 73, > Don W3FPR > > > -----Original Message----- > > > > After the discussion on computer noise, I was reminded > > that I have a problem with noise generated by my > > Viewsonic crt monitor. I use my computer for logging, > > so it has to be on when I'm on the air. Does anyone > > have any ideas on how to reduce/eliminate this type of > > noise? I thought about making some kind of ground > > sheild inside the case of my monitor, but that might > > create a cooling problem. Ideas? > > > > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
In reply to this post by Mark - W5EZY
I have to second that. I was using a gateway monitor, but went to the Dell 17". Virtually no noise. They are made by Phillips. 73, Bob K3YT _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
In reply to this post by Jim Sheldon
> (don't get a plasma screen monitor as some of them radiate worse than
> the viewsonic) If you think about how they work... They're pretty much a giant, flat, modulated spark gap transmitter, aren't they? :-) http://electronics.howstuffworks.com/plasma-display3.htm (and the next page) -- "Nosey" Nick Waterman, Senior Sysadmin. #include <stddisclaimer> [hidden email] The world's coming to an end. Log off and leave in an orderly fashion. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
In reply to this post by Don Wilhelm-3
Don Wilhelm wrote:
> The best solution that I can offer is to replace it with a TFT (LCD) > monitor. Takes up a lot less space on the operating desk and does not > generate so much trash in the RF spectrum. I suffered from the same thing > for a long time and finally just bit the bullet and bought one - I have been > very pleased. I agree. Recently I had to buy a new computer for my XYL, who already had a flat-panel monitor. Dell offered a nice one for $100 with the computer, so the old one ended up in my shack. It definitely is more RF-quiet, as well as being easier on the eyes. Having said that, most of the noise from CRTs is radiated by the cables. I would wrap as much of the power cord and video cable as possible around big ferrite cores. If your problem is mainly on 160 or 80 meters you might best use the 43 mix, which is more effective at low frequencies. Simple snap-on beads are ineffective at HF. My attempts to shield the whole monitor with aluminum foil, etc., also did not produce good results. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
In reply to this post by Mark - W5EZY
Try changing your CRT monitor's refresh rate first.
If you're using Windows, right click on your desktop to bring up the Display Properties dialog. Choose the Settings tab, and click on the Advanced button in the lower right. Under the Monitor tab, try choosing different settings under Screen refresh rate. You may have to lower your screen resolution to get more refresh rate options. There's a little slider on the same dialog with the Advanced button. This may or may not work, but it's worth a try before buying a new LCD monitor. But the LCD monitor should probably do the trick if that doesn't work. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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