RFI
 

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Schematic
RF Current Meter
Telephones

K1UQ's  Feedline System
RFI Reduction & Lightning Protection
 

Schematic
Shows current measurements taken with and without the Line Isolators.
Refer to
Grounding for details on Line Isolators.

Palomar RF Current Meter - Model PCM-1
(Bummer - while at the Palomar web, I just found out these have been discontinued)
Amazing how a simple product such as this can become so valuable in tracking stray RF currents.  To be able to see these RF currents, find where they are flowing, and measure is extremely useful.  Now you can actually see cause and affect - before and after measurements can show if your RFI fighting tactics are working.

Telephones - RF Immune Models 
These telephones are 100% "bullet proof".
Good way to demonstrate the problem is often the phone and NOT the transmitter!