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Author Topic: computer getting into my hf rig  (Read 454 times)
N3BIF
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Posts: 1190




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« on: June 02, 2002, 12:32:06 AM »

     Greetings,  I am looking for a fix to keep my computer from causing interference in my hf rig, a ts 520s, if the rig type matters.  It seems that on 10-15 I have no problem on 20 a little and then progressively worse on 40 80 and 160, so much so that i have to shut it off when i am on the air. the noise is just low grade hash but it will pretty much knock out any thing on 80 and 160 and is uncomfortable on 20 and 40, it has a steady presence so i feel it is not AC, also it is the pc itself not the monitor , i have nothing else in the system other than the pc's harddrive  and a cd drive but the noise is present with out the cd drive driving, the computer is scratch built with i believe an amd processor. The computer is about 3-4 feet away from the rig and everything is grounded but removing the ground shows no increase in the noise, any ideas ? thanks , i would like to use the logging program etc while on the air for obviuos reasons,
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K0HZI
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Posts: 470




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« Reply #1 on: June 03, 2002, 09:01:28 PM »

Check though the Elmers Forum here at eHam, there was a qutie a few posts about computer noise. Also the ARRL RFI Handbook, that has some methods to try. You could try another 120 VAC outlet for the computer, even using a extension cord, two wire with ground, to another room to see if that helps. From what you describe, most likely the power supply in the computer,  cheap switching power supplies generate lots of hash.  Again check the posts and the RFI Handbook.
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AE4TR
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Posts: 43




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« Reply #2 on: June 15, 2003, 09:27:55 AM »

I also had the same problem.  My interference was coming from the power cord to the computer, apparently it was broadcasting the rfi and the rig was picking it up.  I went to RS and bought a shielded power cord for the computer.  It helped some.  I also had an rfi filter for the power cord, which I installed. (don't ask where I got it, I don't remember, but I'm sure there are some on the market.) This stopped my problem of the computer getting into the rig.  Hope this helps. You might make sure the computer is well shielded also.  Tighten all the screws in the cover and stuff like that.  73 AE4TR
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