[RFI] HomePlug OK?

[Jim Brown]

On 9/2/2018 4:12 PM, Joe wrote:
>
> Not with Cat5e cable, and even less so with Cat6 cable.
>
> (I am all Cat6 and have no issues on any ham band, 160 up through 10 
> and into the VHF/UHF/ and microwave bands.)
>
How can you be certain of that when part of what you hear on your 
antennas is everyone else's noise? Take that away and you'll hear your 
own trash. Have you gone through your own home and replaced all the 
noisy switch-mode power supplies with linear supplies? The average home 
has at least a dozen, and many homes have more.

I've heard Ethernet noise using Belden Mediatwist. It's radiated as a 
common mode signal, and has little if anything to do with the quality of 
the cable.

> All my noise is generated by those *%$#*&@@#$* plasma TV's everyone 
> bought 3-5 years ago.
>
And if that noise wasn't there, you'd hear their switch mode power 
supplies and various gear with any form of digital electronics.  Here's 
an email I received last week from a contester friend.

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Thanks Jim, for your emphasis on noise reduction in our stations!

Someone was yelling at you in TowerTalk earlier this week, and that
reminded me of your noise crusade, and how I've been bothered by
that noise showing up in the the WSJT spectrum display on 160m.

So, today was "noise elimination day." Eliminated 4 wall-warts
(where did they come from! who put those in!) Made powerpole
cables to the regular big 12 supply. Got ferrite on the HDMI cable
to the PC monitor. Found and replaced an outside power supply
(at the Comtek boxes)that looked heavy like a linear, but was a
switcher. The WSJT spectrum display on 160m is now mostly
clean and quit. Now, I can see and hear the neighbors crap...

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73, Jim K9YC