[RFI] Honda Fit RFI

Jimk8mr at aol.com Jimk8mr at aol.com
Mon Aug 20 10:50:15 EDT 2007

I recently acquired a 2007 Honda Fit. It has several problems with RFI, one  
of which I find particularly puzzling.
There is a broadband noise, spaced every 20 KHz.  It can be heard from  40 
though 2 meters (probably on 80 as well, but I haven't done much  listening 
there yet).  It is most noticeable on 15 meters, where it  approaches S9 on the 
IC-746 with a HamStick antenna. (IC-746 preamps off).
The noise is perhaps 15 KHz wide, though never totally disappears in the  
frequency gap. There is a weak carrier embedded in the noise band.
It does not start until the vehicle is in motion.  Once motion starts  the 
noise appears from 0 to maybe 15 seconds later, usually sooner than later.  Once 
in motion, it switches on and off, usually more on than off. It is on for a  
few seconds up to maybe 15 seconds max, will drop out for maybe a half second 
to  5 to 10 seconds, then back on. There is no noticeable relation to vehicle 
speed  or engine speed. I can put the car in neutral while moving with no 
effect on the  noise.
Once the car stops (engine still running) the noise may continue for  several 
more seconds, but then does not reappear until the car starts moving  again.
I did notice one time, just after stopping, that there seemed to be a  
compressor like acoustical noise coming from up front that seemed to stop when  the 
RF noise stopped. I haven't had time to follow up on this, and today it is  
raining which makes it hard to do tests with windows down and/or the hood  up.

Any opinions from the experts on frequency?
73  -  Jim   K8MR

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