[Icom] IC-2100H alternator whine problems

Fri, 10 May 2002 10:48:27 EDT

In a message dated 05/10/2002 02:21:13 Eastern Daylight Time, 
[email protected] writes:

<< Only hear the whine noise on transmit and seems
 to vary with the load on the battery, ac on, etc.  His radio is directly
 connected to the battery. >>
1.Does he have connection to both battery poles, or just the "+" pole?
2.Does he have good ground for his antenna or is he using a "magnetic mount"
Both of these are situations which I've cured with a good ground.

If he has a good ground (at battery) for power and a good ground for the 
antenna, then try a line filter.  ICE (International Communications 
Engineers) in Indianapolis, In. makes one I like. (My comments assume that 
the vehicle's electrical system is free of defects.)

In the "old days" when transceivers were larger, most had a built in filter.  
Now, for economy of space and price, the filter is not included.

73, Blair K3YD  