We criticise our communications ministry for poor choices but when you consider we have nearly 5000 transmitters across the country we are not doing too badly. That is one transmitter for every 5200 people. The areas not covered by city, regional or small community transmitters or translators as they are
TV signal is almost always present. Signal is actually part of the light spectrum. Light you perceive it because it illuminates your environment but the RF spectrum is tucked away in that light. Man has learnt how to use it to transport messages around the globe. Like the trading barges of the past riding on the river the TV signal rides on the back of this natural wave/ energy called RF spectrum: Radio Frequency spectrum. An interesting thought why is it call Radio Frequency and why not something else.
Radio today comes in 3 formats: AM, FM AND DIGITAL. Let’s first look at AM. This is what has been used for many many years as the very long wavelength makes it functional for use where distant reception is needed. The downside is the waves are very long and interference easily occurs. Still today there are many am stations continuing to operate.
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 around the main city which are UHF but carry the same programs. But note the big transmitter is VHF.
Several factors can affect this:
- Environment – Television signals obey the physical universe and bounce of anything solid. Hills, trees, well you name it, can weaken the signal. Also, the further the signal has to travel the weaker it gets. A good antenna will be able to function effectively despite the barriers. Read More