Digital television is still using the same frequencies as the normal analogue television but the carrier wave will contain the digital signal rather than the both.
Digital television can come in standard definition and there are high definition channels. The following channels are in High definition in the major cities of Australia.
Channel 20 for Channel 2 Channel 30 for SBS 28 Channel 70 for Channel 7 Channel 90 for Channel 9 Channel 12 for Channel 10.
Digital television also has sub-channels that most television stations can utilise as the second camera channel for major sporting events. Channel 21 is the ABC-2 and Channel 31 is the SBS News. Both government stations also has a few channels that is broadcasting the radio.
Excuse my ignorance, but what is a digital antenna? Would I be correct in assuming that the digital bands are outside of the normal analog range of channels/antennas?
All antennas can receive digital broadcast because the initial carrier wave is exactly the same. The only difference between the digital antenna and the regular is that the digital has a larger gain for those bad reception areas.
Instead of snow for poor reception you get problems such as the sound processor turning off, pixalation of the pictore or the picture will drop off entirely.
My "bleeding obvious" guess that the reception that is furtherest away from the transmitters will be susceptible hence why a digital antenna is the better choice. Also the choice of cables because they can also cause the signal to drop. There are grades for digital reception.
The channel numbers he quotes above are the new, agreed digital channel numbers - NOTHING to do with the official analogue FREQUENCY related ones that have been around for decades.
In reality:
ABC uses analogue Ch 12 for SD, HD and ABC2.
Channel 7 uses analogue Ch 6 for SD and HD.
Channel 9 uses analogue Ch 8 for SD and HD.
Channel 10 uses analogue Ch 11 for SD and HD.
SBS uses analogue Ch 34 for SD, HD and SBS 2.
( Channel 31 is an analogue signal only )
Each old analogue channel can accommodate 2 x SD and 1 x HD signal simultaneously.
Digial TV can have channels outside what normal analog TV antenna are designed for. In Sydney the ABC on digital for instance is on CH12 instead of CH2. Many older analog VHF antenna can have significant loss of gain on CH12. "Digital" antenna are simply designed for these channels. See
formatting link
for the channel allocation.
There are also "log periodic" digital antenna that claim to achieve lower bit error rate on digital TV, at the expense of gain.
--
rgds,
Pete
-----
http://pedro.spyw.com
The time here is- http://tinyurl.com/6sfgd
'One of lifes great mysteries- how does 100g of chocolate create 1kg of fat?'
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.