Put toroids on the power leads going to the motherboard (the big 24 pin monster will probably take the split ones and the second one is usually 4,6 or 8 pin. Except for the 8 pin you can usually wrap them thru a toroid, for the 8 pin, you likely will need a snap-on.
On grounding the computer, Gerald had a hint many years ago to ground it using one of the external scorews of the power supply. If that doesn't do it, I would suspect the power supply itself. You can spend a fortune on a well-designed PC power supply but I would not go over 125. PC Cooling is a good brand, not too expensive but well engineered. Keep on trying! Neal Campbell Abroham Neal Software Programming Services for Windows, OS X and Linux (540) 242 0911 --------------------------------------------------------------------- Try Spot for OS X, the intelligent DXCluster Client at www.abrohamnealsoftware.com - $15.99 ------------------------------------------------- For a great dog book, visit www.abrohamneal.com ------------------------------------------------- See the FlexRadio Systems Flex-5000a in action at www.flex-videos.com On Tue, Dec 30, 2008 at 3:21 PM, <w8...@yahoo.com> wrote: > Hi Neal, > > Thanks for the suggestions. I tried changing the refresh rate, resolution, > etc but to no avail. The noise continues even after removing the monitor > cable from the video board. I would guess this pretty much eliminates the > video end of things. > What can I do re the pwr supply other than toroids on the 120V input ? > > Thanks, Art > > > ________________________________ > From: Neal Campbell <nealk...@gmail.com> > To: w8...@yahoo.com > Cc: flexradio@flex-radio.biz > Sent: Tuesday, December 30, 2008 1:48:32 PM > Subject: Re: [Flexradio] New Computer= noise > > Merry Christmas Art! > > The two areas I would concentrate on are the video hookup and the power > supply. > > How many toroids do you have on the cable going from the video card to > the monitor? Try changing the refresh frequency on your display and > see if the behavior changes. You can do this by right-clicking on the > desktop, then click on the right-most tab and click the button called > advanced. Under the monitor tab, you can usually change the refresh > freq. If there is a box there that says "show only frequencies > supported by the monitor" leave it checked initially. If it doesn't > show you any options with the boxed checked, uncheck it. You will > usually see 60z, 70hz and one inbetween (64.5 maybe?) Just see if it > changes anything. If it does you have the right area. It may not be > the solution but at least you know where the problem is. If its there, > try changing to a better shielded/toroided cable. > > If its not the video card, I would make sure you have ground the heck > out of the computer case to the same ground as the radio. Just as we > were always suspicious of switching power supplies for our rig, > computers have always used them in the modern age and cheap computer > power supplies are a gift from hell. I haven't ever used a compucase > case before so cannot testify abt their power supplies but a good > grounding and toroids on any piece of wire connected to it should help > mightily. BTW, most of those snapon toroids are worthless. The only > ones I can recommend are the big knuckle buster ones from DX > Engineering. Otherwise you are much better off getting some big donut > ones. > > 73 es I am sure you will figure this out! > Neal k3nc > Neal Campbell > Abroham Neal Software > Programming Services for Windows, OS X and Linux > (540) 242 0911 > --------------------------------------------------------------------- > Try Spot for OS X, the intelligent DXCluster Client at > www.abrohamnealsoftware.com - $15.99 > ------------------------------------------------- > For a great dog book, visit www.abrohamneal.com > ------------------------------------------------- > See the FlexRadio Systems Flex-5000a in > action at www.flex-videos.com > > > > > On Tue, Dec 30, 2008 at 1:09 PM, <w8...@yahoo.com> wrote: >> Help please! >> >> Santa brought me the pieces parts for a new computer and I have >> successfully assembled it, Flex 5000A runs great on it at 10 to 15% CPU >> useage @192 range But: horrific noise peaks at 100 khz intervals, This is >> most pronounced on the 80 meter band. There are minor peaks at 50 khz >> intervals. The overall noise floor is also higher. >> >> Pieces Parts as follows: >> Case&Pwr Supply--Compucase 6AR6BS2fxFX585 >> Motherboard -------Gigabyte GA-EP45-UD3P P45 775R >> Video Board --------Gigabyte N95TOC1GH 9500GT R >> CPU-----------------Intel E 8400 3G 775 45N R >> Memory------------- 2Gx2/CORS >> Harddrive------------WD 2500AAKS >> DVD-----------------Samsung/SH223 >> >> Have tried turning the monitor off. The only thing that helps the noise is >> to turn the computer completely off. Removing the antenna from 5000A seems >> to eliminate it on the panadapter as well as audibly. When I turn the 5K off >> the noise is still present on a separate rig. >> >> Any suggestions would be appreciated. >> >> 73, Art K8JK >> >> >> >> _______________________________________________ >> FlexRadio Systems Mailing List >> FlexRadio@flex-radio.biz >> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >> Knowledge Base: http://kc.flex-radio.com/ Homepage: >> http://www.flex-radio.com/ >> > > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
