Topband
[Top] [All Lists]

Re: Topband: Computer noise

To: topband@contesting.com
Subject: Re: Topband: Computer noise
From: fmoeves <fmoeves@twc.com>
Date: Tue, 26 Nov 2019 09:26:45 -0500
List-post: <mailto:topband@contesting.com>
Don't forget lights. I just installed 2 8' 4 bulb t8 lights from Home Depot. 
Terrible rfi on 160 Cooper lighting sent me new ones with filters in them 
worked great. HD sell commercial lights with no filters. I also have chokes on 
everything that enters my PC. And have started using the big 4" and 2.5 chokes 
with rg-400 at antenna feed points. Really cut down on rfi, noise and PC 
lockups. Fred KB4QZH 
-------- Original message --------From: Artek Manuals 
<Manuals@ArtekManuals.com> Date: 11/26/19  8:41 AM  (GMT-05:00) To: 
topband@contesting.com Subject: Re: Topband: Computer noise 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 DaveNR1DXOn 
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-- 
DaveManuals@ArtekManuals.comwww.ArtekManuals.com_________________Searchable 
Archives: http://www.contesting.com/_topband - Topband Reflector
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
<Prev in Thread] Current Thread [Next in Thread>