[RFI] A source of RFI

[Roger (K8RI)]

I know this sounds trite, but get a good computer.  I'm running two 
monsters in full size, steel tower cases within 3 feet of the rigs, USB 
cables and standard serial cables (com1 and com 2). I have no 
interference and no chokes on any of the lines.  The 75/40 sloping 
dipole is about 60 feet from the computers.  O
Desktop computers (PCs) typically use plastic cabinets and inexpensive 
power supplies. The same goes for network interface cards.

It's often not just the cables that radiate, but the computer itself 
with the plastic cabinet makes for no attenuation to signals from inside 
the computer.
Jim Brown (K9YC) has an excellent page on grounding and choking, but 
with plastic cases...who knows.

Antennas are 60 feet of more distant, but a fire in the RX coax 
connector doesn't hear the computers either.

73, Roger (K8RI)

On 5/29/2017 Monday 1:21 PM, JW via RFI wrote:
> Ken,
>
> Kinda more or less known; different screen refresh and or resolutions have been known to "shift" those frequencies too. If a fave freq is blocked by a birdie, try making a change in the above mentioned parameters.
>
> Jim WB5WPA
>
>
>        From: Kenneth G. Gordon <kgordon2006 at frontier.com>
>   To: RFI at contesting.com
>   Sent: Monday, May 29, 2017 12:07 PM
>   Subject: [RFI] A source of RFI
>     
> Hmmm...well, yesterday, I found that a source of RFI on (at least) 40 meters is the desktop
> computer sitting on my operating bench. RFI changes with changes in the "scene" on the
> screen.
>
> Turning off the 'pooter resulted in noise level dropping to S-1 (transceiver in narrow CW) on
> selected frequencies.
>
> I'm not sure at this point how to fix this, but I'll be working on it.
>
> What brought it to my attention was a weak but steady carrier on 7053, which would
> disappear when I changed to a different piece of software on the 'pooter.
>
> Sigh.... :-(
>
> If it isn't one thing, its another.
>
> Ken W7EKB
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
>
>     
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>