[RFI] Kenwood TM-D700

[Michael Coslo]

On Oct 29, 2008, at 11:48 AM, Hardy Landskov wrote:

> Not odd at all. The alternator is varying the 12 VDC and frequency
> modulating the transmitter. Look at the 12VDC line with a scope and  
> you will
> see what's happening. I believe a big common mode choke is in order  
> or try
> running the TM-D700 power cables directly to the battery as the car  
> battery
> looks like a 1 Farad capacitor. Sounds like the TM-D700 is not  
> decoupled
> from the 12 volts very well.


My D-700 will make this noise with the vehicle turned of, and I'm  
running directly to the battery.

Actually, if you all could hear the sound, it would be apparent that  
it isn't alternator or other vehicle based stuff. Whe I first had it,  
I thought it might be RF getting into the audio, but it isn't that  
either.

I'd say it's like a high pitch bronx cheer that lowers in pitch over  
say 1-2 seconds, then goes away.

-73 de Mike N3LI -