[TowerTalk] HamIV Rotor HUM

[Tony Brock-Fisher]

I had the same problem with several Hy-Gain rotors here.

The problem is a ground loop formed by the high current AC return line 
from the rotator, which can return either via the rotor cable, or via 
the tower ground, to your house 3rd wire ground, through the ground pin 
of the AC plug on the controller box. Some of this current finds its way 
into the radio audio circuits.

My simple fix was to install a 'cheater' plug adapter on the control box 
line cord, with the ground tab NOT connected to anything. This breaks 
the ground loop and forces all the current to return through the cable.

Try it - you'll be amazed!


-Tony, K1KP

p.s. please, no comments about the safety of this approach!