——– Original Message ——–

Hello: I read the item in today's CGC issue regarding wideband noise 
from the route signs mounted on MTA buses. I got another source you 
might want to check out:car washes.

A few months ago, I took a company car to be washed at a self-serve car 
wash. This is the kind of car wash where you sit in the car while a 
rolling mechanism goes back and forth spraying water,liquid soap and 
wax. While waiting for the car wash to begin, I decided to listen to a 
Dodger game on the car radio. I believe the station was KMPC on 830 
kHz.The moment the mechanism started, a loud sweeping whine came on and 
wiped out the signal from the ballgame broadcast.This whine was strong 
enough to block all the other stations on the AM dial.This whine 
continued until the mechanism was done with the car wash cycle.

I wondered if this whine noise can be heard a distance away since the 
signal sounded very strong. Does anyone on this list know what kind of 
electronics would be on this type of equipment to cause such a noise? 
Another noise source to consider!!