I second the power supply as well. I used
to build a computer with every new
generation of chip that came out and found
the cheaper supplies were usually noisy.
There's several good brands today & the
last one I used was either an Antec 700W
or OCZ 700W. I can't recall which but both
companies make good products and no RFI I
can see/hear. I think it was the Antec...
73,
Gary
KA1J
> Could be coming from the power supply? Sometimes simple clip on chokes
> are not enough either. I have a similar problem here on 20M I have
> dual (Identical) monitors . One has an irritating but not
> debilitating spur on 20 the other doesn't ..If I swap the monitors
> the spur follows the monitor. Have tried a handful of ferrites to no
> avail so it is likely "radiated" IMO and not conducted.
>
> Grumpy Dave
> NR1DX
>
> On 11/26/2019 6:41 AM, Rodman, David wrote:
> > A few ideas might be helpful here. I was at the station over the
> > weekend and found a significant amount of noise coming from one of
> > two computers in the station. Significant noise S5 at 1820. One
> > computer runs the cluster and 2m connection. That was clean. The
> > other handles most of the remote chores and has about 15 USB serial
> > devices attached. Everything was off, except a battery operated
> > transceiver attached to the receive antenna feed, the modem for the
> > cable and my router. One can definitely see that operating the
> > computer, closing windows or plugging in USB devices causes the
> > modulation on the signal to change, this isolating the source to the
> > computer alone and possible connections to peripherals (they were
> > all turned off by the way). I did have few chokes available but
> > attaching them to the USB wires out of the computer to their various
> > devices made no improvement. I could get more specific but need to
> > leave for my office now. Any ideas might be helpful and appreciat
> > ed.
> >
> >
> > ---
> > David J Rodman MD
> > Assistant Clinical Professor
> > Department of Ophthalmology
> > SUNY/Buffalo
> >
> > Office 716-857-8654
> > _________________
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> > Reflector
>
> --
> Dave
> Manuals@ArtekManuals.com
> www.ArtekManuals.com
>
>
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