[OZAPRS] HF APRS upsets the car's climate control

Michael Carey michaelcarey at internode.on.net
Fri Dec 19 13:30:03 EST 2008

This site, http://www.k0bg.com/ has all sorts of great info on mobile 
amateur operation. Take a look through the bonding and grounds sections. 
You will also see some photos of my mobile installation in the photo 
Make sure you are using material 31 ferrite cores. These have the best 
performance on HF frequencies. If you don't know that you have material 
31 ferrite cores, assume you don't and get your hands on some, they work 
wonders with RF current flowing where you don't want it!
As Ray has said, changing the path of the coax will have little if no 
impact on any interference caused to or from a radio installation.
Also make sure you aren't over modulating your transmit signal. This can 
create a lot of distortion. Clipping SSB can cause all sorts of weird 
things to happen.

Tim Ahpee wrote:
> G'day Folks,
> I've just got HF APRS running in preparation for my trip at the end of the
> year and have come across an interesting one. Each time the rig transmits the
> fan in the climate control goes to full power. Nothing else seems to be
> affected just the fan. It was a bit of a shock the first time it happened. I
> was driving along and heard the TX relays go click then I was blasted in the
> face with air. 
> Details:
> Rig: Icom IC-7000
> Car: Toyota Prado 2008 Diesel
> Antenna: Diamond HF30FX mounted on the bull bar
> Any thoughts? I'm wondering if the RF is getting straight into the motor
> controller for the fan because if the fan is off nothing happens.
> Cheers,
> Tim
> _______________________________________________
> Ozaprs mailing list
> Ozaprs at aprs.net.au
> http://aprs.net.au/mailman/listinfo/ozaprs

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