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Quick Question - Vhf Ch1-11 Indoor Antenna Ok?


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#1 pgdownload

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Posted 14 November 2014 - 08:51 AM

Hi,

 

Just sorting a cheap indoor antenna as a possible temp solution to the main antenna being knocked out for a while. I'd have assumed any such antenna now being sold could tune in to all the digital channels? 

 

But if VHF only sufficient? Do I need a UHF/VHF indoor antenna?

 

Regards

 

Peter Gillespie



#2 Malich

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Posted 14 November 2014 - 11:49 AM

Depends entirely where you are and what sort of indoor antenna your using. As a rough guide:

 

If you're in a capital city and currently receiving good signal from the main transmitters, then it could be OK. Simple indoor antennas aren't particularly narrowband, so despite the fact that ABC is on RF Ch12 they'll probably receive it OK.

 

If you're in a regional area, or in a major city and currently receiving from a translator/fill-in site, then you'll want a UHF antenna.

 

As for the antenna (remember, this a rough guide!): The old-school 'coil' type indoor antennas are surprisingly wideband, and are probably the best all-round bet for a good signal area (primarily VHF, but they often work surprisingly well at UHF). Rabbit-ears should be laid horizontally, and can be tuned a bit to suit VHF / UHF or individual channels by adjusting the length of each leg. Almost anything with a loop is purely decorative.

 

Amplified indoor antennas are usually bandwidth limited (either by design, or accident of poor design), so you'll have to decide whether to believe the specs printed on the packaging...



#3 pgdownload

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Posted 14 November 2014 - 08:37 PM

Thanks Malich,

 

Inner city Melbourne. Just concerned there's a lot of UHF spectrum that is apparently not needed now. 

 

Its a $20 simple solution. Just wanted to know its a better than 50-50 chance of working.

 

Regards

 

Peter Gillespie



#4 alanh

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Posted 15 November 2014 - 09:57 AM

Peter,

Type your street address into

http://myswitch.digitalready.gov.au/ It will tell you what antenna to use.

There is now no transmitting site in Australia which requires a VHF/UHF antenna. It will be either band 3 VHF, or UHF only. That is one of the effect of the restack which has been occurring throughout this year. The only exemption to this are the community TV stations in the mainland state capitals. These will be switched off at the end of next year.

 

Inner city Melbourne has terrible VHF reception from Mt Dandenong, which is why there is now a new set of translators in the CBD as well as another set in South Yarra.

Both of these sets of translators are vertically polarised.This means that the antenna part which connects to the receiver must be vertical where as it is horizontal at Mt Dandenong.

 

 

Use a http://www.jaycar.co...w.asp?ID=LT3114 Its half your price. The loop is the UHF antenna. Keep the rods as short as possible.

 

Alternatively use a pair of rabbits ears folded flat with a total length of 240 mm.

The rod end must point to the floor. There is no point in adjusting direction. The best location will generally be near a window. 

 

Do a rescan the receiver for channels with no antenna connected. This is to remove any existing channels. Start the scan for channels and plug in the antenna after it passes channel 12. This will ensure that the new channels are not given numbers such as 350...

 

Alanh


Edited by alanh, 15 November 2014 - 10:20 AM.


#5 pgdownload

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Posted 15 November 2014 - 03:07 PM

Appreciate the answer and extra advice Alan. It might not work still, but I feel I've got a decent chance now.

 

Thanks

 

Peter Gillespie



#6 alanh

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Posted 15 November 2014 - 09:18 PM

Peter,

The inner Melbourne transmitter is located on the top of Bourke Place, 600 Bourke St Melbourne. 

 

By the way the loop antenna is directional.

 

I should add that from the end of last year there has been no transmitters using TV channels 1 - 5A. As a result instead of the antenna being upto 2.5 m wide, the new maximum is around 842 mm.

Those channels are unreliable DTV.

 

Alanh 



#7 Malich

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Posted 18 November 2014 - 12:56 PM

By the way the loop antenna is directional.

 

You're assuming that the circular object is a loop antenna, or even an antenna.

 

Not wise to rely on the look of the thing, or even what the chinglish on the packaging says. You might want to forget your opinion, investigate it yourself, and come up with some more valid results...

 



#8 hrh

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Posted 18 November 2014 - 02:43 PM

You're assuming that the circular object is a loop antenna, or even an antenna.

At risk of supporting him, it's what the Jaycar page says - no chinglish.

#9 Malich

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Posted 18 November 2014 - 10:13 PM

Without wishing to impugn the nation's finest purveyors of farting toys, try pulling apart any of the models they sell and see for yourself if it's a directional loop antenna... :whistle: