A/C Fan Motor Noise

[ctvanover]

I know that there is probably thread here some where that describes this but here goes. I drive an L-model Kenworth, it has a Galaxy 33 strapped to the dash. Whenever the blower motor is on it picks it up and whats worse is that when the sleeper blower motor is on it is even worse, it's like your picking up both blower motors at the same time and you just can't hear anything unless they're with in 500 to a 1000 feet of you. What can I do to solve this noise problem.

Any idea if the Magnum DC Power line Noise Filter CB Ham Radio XLF-20C is any good or not?

Any and all help will be greatly appreciated!
Chris

 

[Beetle]

First, with the noise present, disconnect the antenna and see if it goes away.

If the noise remains with the antenna disconnected, the noise is coming in via the power line and some type of filter would probably work.

If the noise goes away when you disconnect the antenna, the noise is being radiated. With DC motors, the first choice would be to replace the brushes. If that doesn't do the job, I'd install some disc ceramic capacitors from the power terminal to ground, with as short leads as possible.