Written: August 14, 2018
In Australia today most transmitting towers for television in regional areas are UHF.
However, for caravanners travelling interstate their Caravan Antenna still has to work on VHF because all Capital city main transmitters are VHF.
It is true there are satellite systems (small free to air transmitters scattered in difficult terrain for a small area coverage) around the main city which are UHF but carry the same programs.
But the main transmitter that services all of the capital city is VHF.
There are odd exceptions to the above regional statement with some VHF transmitters surviving. The VHF channel numbers are 6 to 12 or they can be called Band 3 type signals.
One place called Middle Brother servicing the Manning river area still uses VHF frequencies. In this case, to add even more difficulty for the caravanner, they are also vertically polarised.
It would be safe to say that pretty well all caravan antennas sold would not work except ours. Explorer would have a hope because we include a set of matched elements for VHF use. In addition, you can adjust the size as we have used a threaded aluminium rod which we have had made especially for the job. Our amplifiers also provide for amplification on these Band 3 channels.
A close look at this transmitter at Manning River shows ABC SBS Seven Ten and Nine using a useable amount of power at 80 kW. The signal is sent directionally. This means it is not sent out in a 360-degree radius rather it is pointed towards where the population is located. They are vertical and the terrain is undulating. Signals will be closer to the ground.
It is really important for Caravanners to get their head around UHF, VHF, vertical, horizontal and directional as opposed to omnidirectional A thorough understanding of these terms will assist to understand what is required when setting up a Caravan antenna for quality viewing. See our Glossary and other blogs for an understanding of these terms.
RF Consultant Founder
Wilkgard Technology Group P/L