Topband: Computer noise

[Gary Smith]

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
> > _________________
> > Searchable Archives: http://www.contesting.com/_topband - Topband
> > Reflector
> 
> -- 
> Dave
> Manuals at ArtekManuals.com
> www.ArtekManuals.com
> 
> 
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
>