[RFI] Question about excess cable length & RFI

Greg Newberry greg at obillow.com
Tue Jan 9 12:15:17 EST 2018

Hi Jim, Thanks for the reply.

I just purchased the Grounding and Bonding book Saturday and have been 
going through it. I found your material about 6 months ago and I've been 
studying it since then. That is what impelled me to clean up my shack 
and put in a SPG. I'm not having any RFI issues in general. I just want 
to put in an effective ground system for Lightning, AC and RF.

The cable length question is more of a preemptive strike. Seems there is 
always a cable somewhere to deal with.

Thank you so much for all your efforts in this group, and the materials 
that you have made available to all of us.


On 1/8/2018 9:06 PM, Jim Brown wrote:
> Hi Greg,
> Before you do ANYTHING:
> 1) Buy and study the new ARRL Book on Grounding and Bonding;
> or:
> 2) Download and study the slides for my tutorial talk on that topic
> http://k9yc.com/GroundingAndAudio.pdf
> 3) Download and study my tutorial on finding and killing receive noise
> http://k9yc.com/KillingReceiveNoise.pdf  (Written tutorial)
> http://k9yc.com/KillingRXNoiseVisalia.pdf (Slides for talk at Visalia)
> Do NOT cut power cables short -- if the gear is noisy, you may need to 
> use the extra length to wind ferrite chokes. Bonding cables SHOULD be 
> short.

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