[Mobile-Portable] NOISE FROM HONDA CRV

[Mark Schoonover]

Dan Coleman W8KMX <mailto:w8kmx at bellsouth.net> tapped at Saturday, May 13,
2006 9:54 AM:

> Hello to all:
> Has anyone successfully reduced/eliminated noise from the Honda CRV? 

No, but what you need to do is vehicle independant. Troubleshooting noise is
the same for any vehicle.

> I 
> would sure like to talk with you.
> My sources of noise:
> 1)  AC/Heat causes the most noise.  As best as I can tell it is
> coming from 
> the DC Fan Motor for the radiator.
> 2)  Ignition (spark plugs)
> 3)  Some noise from the windshield wipers.
> 
> I have done the routine bonding etc and as a test I can disconnect my
> antenna (quick disconnect at the mount) and I get no noise at all so,
> I 
> think that nothing is coming in on the DC line.  Agree?

Disagree. If you get no noise at all when disconnecting the antenna, then
the problem is with radiated noise getting in  through the antenna. The way
to test if the problem is coming in through the DC power, is to run the rig
off a gelcel and check for noise.

 
> Any info would be greatly appreciated as I would rather not start from
> scratch on this.

How have you determined it's the cooling fans for the radiator?? I take it,
there's no noise when the car is cold, but a soon as the radiator fans turn
on, you get the noise?? You can try some clamp on ferrite beads on the
cables that go to the fans. Same with the windshield wipers. If the motor
housing to the fans is mettalic, you could try bonding them to the body with
some braid. Windshield wipers can be done the same way. Just unscrew one of
the housing screws, scrap off the paint around the hole, and attach the
braid there. Make it short as possible to the body, scrap paint, etc around
the body screw hole as well.

The other place to ground well is at the feed point. You don't state what
kind of mount you're using, or COAX. Remember, on these unibody vehicles,
it's possible that there are seams where various sheetmetal parts are not
good RF grounds. You could be using just a small part of your vehicle as an
RF ground. Check out my blog http://ka6wke.blogspot.com for more ideas on
chasing down noise.

You can do it, just take one step at a time and be patient. Hope this helps,
if you have more questions, don't hesitate to ask.

73

Mark
KA6WKE
http://ka6wke.blogspot.com