blue one replied:

Nup,
Not over 7500kms just recently.

Cheers

BenDiD replied:

Thanks Blue One

Ben

RV Powerstream P/L replied:

Swithchmode power supplies can vary and they are diferentiated by The (PFC) Power factor Correction.
PFC comes in two types Active and Passive.
Passive is the cheapest so the potential of EM radio interference with this type is greatest and the PFC is generally only to about PF 0.85.
Active PFC is more effective but is also more expensive so that should tell you something as it is generally PF 0.98 or better.

The main consideration is to ensure isolation of cables associated with your NGT to minimse the chance of any contamination from such devices.

I know of instances where interference could not be avoided so alongside the radio is a switch that turns off the charger while the radio is in use.
Ian

BenDiD replied:

Thanks Ian,

Now I know which type of regulator to look for. The NGT & its cables are fairly well isolated / insulated as I am a bit paranoid about minimising interference - I have just seen so many posts with so many people having all manner of trouble. So far I have been OK and I'd like ot keep it that way!

Cheers again

Ben

Ozhumvee replied:

After many years of installing HF's in all manner of vehicles from Prime movers to small cars I came to the conclusion a while back now that stopping electrical noise interference with HF in modern vehicles with all manner of electronics both OEM and aftermarket was nigh on impossible especially as the manufacturers stuff was the worst. TD5 Landies were a case in point, the electronic injection system overloaded the receiver on the HF to the point where the HF was unusable.
I no longer use the HF when mobile but only use it when stationary with everything turned off except the HF as even the GPS running can cause enough interference to stop it receiving a selcall.
Way to much work to try and stop the interference and it is all negated if the bloke next door has a fluoro light switched on.

mr fixit replied:

TD5 landrovers radiate so much RF they should require there own ACMA licence.

Member - Mike DID replied:

Not all Switchmode Power Supplies are created equal.

I have a 12 volt 60amp supply that produces absolutely no detectable noise on HF - that's why I bought that one and it works !

RV Powerstream P/L replied:

Ben
Mike knows.

What I told you was fact but get a supplier to tell tell you the difference and 99% would not know what they were selling and to top it off the ACMA has three mandated standards that is Cispa 11,Cispa 14.1 /14.2 and Cispa 21 and as long as you having testing to any of the mandated standards then you get a Ctick approval to sell.

The problem is that only Cispa 11 and Cispa 21 cover the emmission standards for radio interference where the interference sould be life threatening such as in a marine emergency so if you are Ctick approved under Cispa 14.1 you are legal but also rat bleep with HF interference so there are big holes in the compliance standards and HF is still the main emergency distress for yachts at sea.
So what I have told you is correct but prove it to be of benefit for your application.
Welcome to Australias beurocratic system of money first technology and safety later but dont worry we will get there but at what cost to the consumer with our pyramid building beurocracy that makes regulations on regulations to get pay increase levels and build their own defensive castle of safe employment.
Ian
Ian

paulnsw replied:

have a Morningstar prostar 30a regulator 2m from HF radio and no interference

BenDiD replied:

Thanks All

It seems that with this topic, like many covered in this forum, the more questions you answer the more you have!

cheers

Ben