two way radio fitting precautions?

For a start the common rail injection system could make your HF unuseable. There's also a slight possibility that selcalling while mobile could bring the vehicle to a halt...not great if overtaking at the time.
Fuse both leads for radios at the bettery end. Keep the HF aerial away from the front end. Use torroids on the injection control box etc etc etc.

Good luck.

I thinks its a bit like the airline industry who claim there is a chance using electronic devices may interfere with the plane's navigation. the odds of it happening are very slim but they want to cover the proverbial bum just in case.

Imagine a vehicle manufacture and provider to the mining and agricultural industries supplying a vehicle that wont support a two way.

The only thing you can do is not place the antenna right hard up against the vehicle computer box and I am certain you aint gonna do that.

I am certain too that Toyata wont tell you not to fit a radio.

Owen

The UHF doesn't worry me much - a direct supply (pos and neg) from the battery and mount the antenna somewhere with a decent ground.

When installing high power (100W) HF radios in a vehicle there are five basic and very important rules: earthing, earthing, earthing, earthing and, finally, earthing.

Again; direct pos and neg from the battery (good fat cable), fuses in _both_ pos and neg. Antenna mount with excellent earth. Check the engine is properly earthed to the chassis, many earth the exhaust system too.

The control electronics of modern vehicles are, usually, very well designed in regard to disturbance from external RF fields BUT they are not immune to them and 100W of RF at HF frequencies has much more than the minimum capability to kill your EMU in the right circumstances. Avoid running the antenna co-ax parallel with vehicle wiring for any distance, check your EMU (and any other electronic modules you are aware of) have the appropriate metal coves in place and ensure those covers have a good earth.

A Web Site For Mobile Amateur Radio Operators

Let us know how it all goes.

Mike Harding

PS. Did I mention earthing? :)