It is looking as if I have located yet another one of these offending devices, this one in the Brisbane suburb of Carindale.
It is located in a private residence in very close proximity to the Carindale shopping mall, and despite being in a hollow, it can be easily heard from many hundred metres around, and on higher locations over 1 km away.
This interfering carrier is radiating on 147.0067 MHz and is distinctly vertically polarised. I think these things may be radiating between 100 and 250mW EIRP judging by the strength of the carrier, and is radiating continuously.
Keep an ear out as I'm sure there is going to be plenty more out there just waiting to be heard.
I have also located another interference source, or or close to 147.000 MHz, but this is not radiating a strong signal, and may be something like an oscillating TV preamp or similar, as it's carrier is horizontally polarised.
I am getting good at tracing interfering carriers on 2m now!!