[RFI] Local RFI...

[Jim Brown]

Check the ARRL website for info about arc-fault interrupters. Some are 
known to have RFI issues.

You may be setting them off simply because the TX antenna is closer to 
their wiring, or because there's an issue with the counterpoise for that 
antenna.

As to the computer issues -- some computers are better/worse than others 
with respect to RFI. RFI is coupled both on internal wiring due to poor 
circuit layout and inadequate shielding, and also on external wiring due 
to poor circuit design practices inside equipment  like "The Pin One 
Problem." RFI pickup on external wiring can be reduced by the use of 
suitable common mode chokes. RFI pickup on internal wiring usually 
cannot be fixed -- the product must be replaced.

This tutorial on killing receive noise includes specific winding 
recommendations for ferrite chokes that kill RF current on small 
diameter cables. While the tutorial is written for RX noise in our 
radios, the chokes do the same thing for current induced in those cables 
by our transmitters.  In essence, the cables are acting as antennas -- 
they transmit the noise FROM the noise source, and they receive the RF 
that we transmit and couple it to the poorly designed product.

http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC

On Mon,9/5/2016 12:33 PM, Kenneth G. Gordon wrote:
> So, advice? Suggestions? Stab in the eye with a sharp stick? Go away, Kid, you bother me?