Whistling receive

This is a tough one since it sounds like the problem is intermittent. Is this a new radio or used one? Is this a new install on this truck? Delta gave you some great advice about noise from other electronic gadgets in the truck. If it happens to be in the radio, it's either a bad or weak capacitor, or a bad solder joint. Yes you can have an alignment done to the radio if you want. About the only way to get the noise floor down on the radio is to have a tech replace certain parts in the recieve section of the radio. And even that's questionable. The bad thing about spending lots of $$$'s doing that to your radio, is that you still will pickup a lot of noise through the antennas.

 

Quiet, what things do you have in the cab?

You got a phone charger?

Gps unit?

 

When it is making this noise, un plug the antenna coax from the radio and see if it stops.

 

You got it. check the ground activity under the stud that holds the antenna in place, make sure it is seeing bare clean metal and that the plastic washer is on top and not the bottom. get back to me when you can establish these things.

 

To be as accurate as possible, i will need specifics. antenna type, coax type, location of antenna, power cord placement hookup, and immediate swr reading.