[Elecraft] Computer Noise ruining 20 & 30m

[Bill W5WVO]

Yup. Lower wattage supply uses smaller componets which allows the inclusion of 
filter components (presumably due to more room in chassis space and components 
budget). It's a hypothetical model, as I've never taken one of these "big 
boys" apart, but I've seen going to a lower-power supply fix this kind of 
noise problem more than once. Of course, don't go to a PS that puts out less 
power than your computer needs.  :-)

I saw in another post in this thread that Antec was said to be a power supply 
one could count on to be less noisy. I think it has a lot more to do with the 
power rating than with the brand. The PS I had that was putting out so much 
noise was an Antec, the biggest one they made. I'm still using it, but it is 
brute-force choked up the yin-yang.

Bill W5WVO


Alan D. Wilcox wrote:
> SOLVED!
> Just replaced the 400w supply with a 300w that I had in the junk box.
> Both foreign cheap
> units, but that's all the local PC shops seem to carry (at least at my
> QTH). The replacement
> is nicely quiet ... and a lot easier fix than what I was dreading!
>
> Now that I can hear the radio properly, back to doing the remote audio
> with HRD.
>
> Thanks for the help!
> Alan
> ------------------------------------------------------------------------
>
> Alan D. Wilcox wrote:
>> Hello,
>> I gave away the feeble old PC I had by my radio equipment and
>> replaced it with a newer one ...
>>
>> Now I have S9+ noise wiping out 20 and 30 meters.
>>
>> Using same keyboard, mouse, monitor; just the PC in a new case.
>> Evidently it has a
>> noisy switcher supply in it. Tried 110V in-line filter, also
>> different 110V house circuit,
>> but still have noise. Grounds don't help. Don't happen to have a box
>> of toroids for chokes.
>>
>> I've got an old PC supply or two in the junk box, but hoping
>> something else might fix.
>>
>> Any thoughts on an easy fix?
>>
>> Thanks,
>> Alan
>>
>> Alan D. Wilcox, W3DVX
>> 570-321-1516
>> http://WilcoxEngineering.com
>> Williamsport, PA 17701
>
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