Question about Radio Shack TRC-503 CB Radio
You may be overloading the front end of your am/fm receiver, particularly if you am/fm antenna is one of those "in glass" numbers that were/are poplular with a lot of car manufacturers. This problem can be compounded if your CB antenna is in close proximity to the AM/FM antenna.
Disabling the AMC (Automatic Modulation Limiter) in a CB also makes the problem exponentially worse, and that's the first thing a hack technician rips out of there during a tune-up.
Posted on Mar 20, 2009
You may be generating a harmonic from the cb that is picked up by the radio. Check if different channels and if AM/FM act the same. Also if a cd unit, does playing a cd produce the same effect. If all stations and the cd player do the same thing, interference is most likely coming in on the radio power or ground leads. You can get an inline noise filter from radio shack: http://www.radioshack.com/product/index.jsp?productId=2103979&cp=2032058.2032230.2032273&parentPage=family
or you can make your own if you have an old computer power supply by using the toroids if you can get to the power supply lead. Make sure the radio housing is electrically connected to ground. The interference may also be coming in on the radio antenna. Try moving the cb antenna away from it if possible, or test by rotating the cb antenna to a horizontal position temporarily.
Posted on Nov 30, 2007
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