[Elecraft] My KAT500 seems very sensitive to common mode RFI

MontyS montys at mindspring.com
Sun Feb 15 06:31:34 EST 2015


I echo Don's comment.  My MC-60 mic used to be very sensitive to RF in the 
shack and my monitor used to click on and off,  until I placed common mode 
chokes on the coax leaving the antenna tuner, and on the coax feeding a 
balun outside the shack. (Antenna is an open-wire-fed 80 meter doublet.) I 
no longer have any discernible RF problems, save for my amplified audio 
getting a weak buzz when transmitting high power - and that's probably from 
radiated RF, not common mode.  I have no other chokes on other cables.

Monty K2DLJ

Jeff and all,

I see many hams reporting placing common mode chokes on AC lines, DC
lines, AUX cables and other lines in the shack.

I am of the opinion that the proper use of common mode chokes is on the
antenna feedlines. 



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