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AM Radio Reception

C

CWL

Member
Hopefully someone here will provide a little insight for me. I like to listen to a talk radio program on the hour long drive home from work that is only available on an AM station. I get a little static while the truck (2005 chevy Z71) is running far from power lines and sometimes a lot of static near power lines. If I shut the truck off the static goes away. The static changes some with engine RPM. The truck is nearing 150,000 miles so spark plugs and plug wires will soon be replaced with new. This truck has an individual coil for each cylinder and the plug wires are only about 12" long. Is there anything special I should look for when getting new plugs and wires? Is there anything that can be done to improve the signal when driving next to power lines? The radio is a factory unit if that makes any difference.
 
They make a noise filter that can be plugged into your truck anttena plug behind the dash, it filters the whinning noise that goes with the rpms. I think wal-mart carries them in the car audio section.
Ryan
 
Hello CWL,
The noise changing with RPM'S is a sign that it is an alternator noise. You need to put a filter to suppress the noise.Try Radio Shack, or an automotive store, they should have a capacitor to filter out the noise.
Guido.
 
and its very probable that you will never cure the problem. this is very common for am and will never be real quiet. am is a line of sight signal and anything will mess with it.
 
"Bet ol'e B. Hussein Obnobirthcertificate had 'em install it ciz Rush is on AM"

Hmmmm. I had it before the GM bailout and it hasn't been to a dealer since. However it is Sean Hannity that I am listening to.
 
Hello CLW,
P.S. Some alternators of the GM typy also have a capacitor in the field windings.
I suspect that is what is bad on his radio.
a16250.jpg
 
My old '81 Suburban factory radio worked okay, but the factory radios in my '95 F-150 and '90 Ranger were both pieces of poo. I got a lot better reception by swapping them out for low-end aftermarket units.
 
I think you're wrong about line of sight. WBZ is heard in 38 states and I don't think you can see 'em all from Boston, MA
 
Need frequency to be about 1000 times higher to begin line of sight. Low frequency curves well. A high frequency squeal of about 2000 HZ is typically alternator noise, whereas ignition noise is very repetitive and much lower frequency. Powerline is usually leaky insulators and much more like static/irregular and changes as you travel along the powerline, as sometimes you hit a spot with all good insulators & no static. No filter cap you can install will help against powerline interference. You are not hearing the 60HZ.
 
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