Codan NGT and 4.5l V8 Landcruiser

Not an NGT, but my experience with a Barrett 950 is much the same - normal voice comms while mobile don't affect electronics in my 05 GXL TD 100 series, BUT a selcall/beacon trans once killed the motor ! Have only done it the once - scary - had to key off, coast and start it up again (no problem). Learned techno types suggested my installation is the culprit - of that I'm not sure (my earthing seems up to scratch), but it doesn't matter because I'm not trying it again anyway :-o).

Power and Comms cables need to be separate and both need to be away from the ECU.

Cheers

Not at all unusual with lots of different vehicles. The RF from the radio gets into the poorly shielded vehicle electrics.
The diesel common rail and ECU controlled injection systems can make so much electrical noise that the receiver is overloaded and virtually cannot recieve anything on some vehicles.
I used to install HF's and the TD5 disco was the first diesel to cause big problems the radio could only really be used when the engine was off.
My last troopy required suppressors on most electrical items and earth bondng of most panels, doors, bonnet and exhaust before it could be made electrically quiet enough to allow the radio receiver stage to work properly.
If you fit foil type insulation to the outside of the coax and make sure the power cables are nowhere near any vehicle cabling you can stop most of it.
V6 Pajero's are a classic, so sensitive to RF you could hit the tune button on the mid and lower frequencies on the HF in the troopy and the Paj next to you at the lights would stumble and cough when the lights changed, you could easily pull away from them ;-)))

I have a Codan 9323 with autotune in a 200 V8 diesel.

Works a treat with voice, selcall, telcall, beaconing, and GPS sending, while stationary and moving at all frequencies. I also used to send and receive emails with HFoZ.

Never had a problem. Can't imagine it would be any different to a NGT.

Make sure your earths are good to the body, and to the chassis and it should be fine.

Are you having troubles or is it a FoAF issue?

There was a story once a couple of decades ago that a Ovlov's motor stopped every time the owner went to town. I think he was supposed to live just out of Parkes. The local dealers for months never found out what it was. Then an old radio bloke suggested it was radio interference. Yep Spot on. The bloke drove right past the antenna of the local AM radio station. It seems that there was a bad connection on the and in layman's term, the station was emanating a very "dirty" signal. They cleaned it up and the Ovlov never broke down near it again.

As an ex electronics technician I can believe it. Even if the story is false it is very possible.

Get your signal tested with a spectrum analyser and see if it's clean. Any reasonable radio maintenance place should be able to do if they are any good.

Phil

Thanks for the reply's

Hello Andrew,

What is happening here, is when you send out a Selcall or Data (emails) the transmitter normally runs at full output, 100 Watts + with a very high duty cycle.

With voice, the duty cycle in much lower and the output of the TX on average is much lower, and therefore less likely to cause the problem you have.

Try dropping the power and see if it stops it.

The antenna grounding and connectors need to be A1

Cheers