Pagoda SL Group

W113 Pagoda SL Group => General Discussion => Topic started by: bpossel on October 25, 2004, 06:40:36

Title: Eliminate Engine Noise from Radio
Post by: bpossel on October 25, 2004, 06:40:36
What can be done to eliminate the engine noise (feedback) from our old radios?

Thanks!
Bob

bpossel
Memphis, TN.
1971 280SL
1997 E320
Title: Re: Eliminate Engine Noise from Radio
Post by: bpossel on October 25, 2004, 11:34:20
I have been told that most electrical noise in radios is due to improper grounding of the radio and/or antenna.  Also could be antenna cable not seated in radio correctly and/or insulation worn off and touching the car body...

Bob

quote:
Originally posted by bpossel

What can be done to eliminate the engine noise (feedback) from our old radios?

Thanks!
Bob

bpossel
Memphis, TN.
1971 280SL
1997 E320


bpossel
Memphis, TN.
1971 280SL
1997 E320
Title: Re: Eliminate Engine Noise from Radio
Post by: George Davis on October 25, 2004, 11:53:53
Other thoughts:

Bad spark plug wires can be a source of intererence, or loose plug wire connections at either end.  Loose or corroded ground connections could be a source.  Loose connections in any of the ignition components can be a source.  A regular popping noise that speeds up with the engine is probably ignition related.

The factory installed interference suppession on cars equipped with factory radios, but if the car was built without a factory radio it may not have the suppression parts. For example, the ignition coil on my car has a capacitor connected from one terminal to ground to supress interference from the coil (not the capacitor on the distributor, but looks similar).  I think radio noise suppression kits exist if your car doesn't have the factory stuff and you can't find an obvious source.  



George Davis
'69 280 SL Euro manual
Title: Re: Eliminate Engine Noise from Radio
Post by: rwmastel on October 26, 2004, 13:01:21
quote:
Originally posted by George Davis

.... interference suppession on cars equipped with factory radios, but if the car was built without a factory radio it may not have the suppression parts.

I recall when replacing my front rotors, the front axle stubs had little brass(?) posts sticking out of them.  The BBB called them something like "radio noise suppressors" or something like that.  There was a part on the wheel bearing grease cap which reached out and touched (or covered) this small brass post.  Anyone else familiar with this, or am dreaming???

Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both  tops
1994 E420
Title: Re: Eliminate Engine Noise from Radio
Post by: George Davis on October 26, 2004, 13:17:46
I don't think you're dreaming, Rodd.  I've seen mention of the grease cap/wheel spindle radio noise suppressor in the BBB or someplace like that.  My car doesn't have them, lost long ago I guess, but it doesn't seem to affect the radio.

George Davis
'69 280 SL Euro manual