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Greg Pain

Converting external old vhf antenna to combo fm and dab

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Posted (edited)

Does anyone have plans to convert an old analog vhf tv antenna to pick up fm and dab?

I have an old long range fm antenna with the main central beam about 3m long, and a large fringe vhf antenna which I'd like to convert. It doesn't need to be long range; a director, collector and reflector would be suitable, as it will be roof mounted. 

I'm not even sure if the combination fm/dab is possible. I haven't found anything on the net apart from modified coat hangers!

Edited by Greg Pain
Grammar error

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I thought a antenna is an antenna.

 

https://www.acma.gov.au/Citizen/TV-Radio/Television/TV-reception/do-i-have-the-right-antenna-system

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I thought a antenna is an antenna.

 

Thanks, but antennas are not just antennas. My old long range fm antenna won't pick up dab, even though it comes from the same transmitter on the top of Mt Lofty in Adelaide. I have enough antenna bits and pieces to reconstruct the dab/fm antenna which is really want I'm asking for.

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Posted (edited)

I thought that link might lead to something that may help, ah well.

Edited by Muon N'
Forgot a 't'

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Have you tried your antenna set up for Vertical Polarisation (turned on it's side)? It looks like DAB is vertical, and your FM antenna is most likely set as horizontal.

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The antenna on our units is the same one that was there before the advent of digital TV, works fine for Digital TV.

 

Marketing is quite powerful.

 

Like much of the world, Australia is shifting from traditional analog television to digital broadcasting. This means new set top boxes if your TV isn't already able to pick up digital signals.

But that doesn't mean you also need to change your antenna, says Dr Stuart Hay, principal research scientist in electromagnetics with the CSIRO's Information and Communication Technology Centre.

"Antennas made for analog TV signals work just as well for both digital and high definition signals. It's incorrect to claim that you need a special antenna," says Hay.

 

http://www.abc.net.au/science/articles/2011/05/19/3219974.htm

 

I just think of all the 'new' digital antennas sales, and the many perfectly fine antennas that are now in land fill.

 

Edit: so i guess, if the antenna you have is only VHF compatible then you need one that covers both VHF and UHF regardless if it is called analogue or digital.

 

Here’s the basics of how an antenna works:

A broadcaster, or transmitter, takes their content (which could be data, pictures, sound or some combination of all three) and converts it to electro-magnetic signals referred to as “radio waves”.

 

 

Edited by Muon N'

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I thought a antenna is an antenna.

 

Thanks, but antennas are not just antennas.

 

My old long range fm antenna won't pick up dab, even though it comes from the same transmitter on the top of Mt Lofty in Adelaide. It is over 3 metres long, has 7 directors focusing on ch3 and ch5 collectors with a reflector behind these. It is set for verticle polarization, so its pull is very strong. However, from what I've read, it is too 'frequency specific' to pick up dab.

 

Comparatively, my current tv antenna is a Hills 'bedstead' CA16 (obviously set horizontally). I need a strong antenna for tv like this one, as even though it is a high chimney mount, it has to pick up signal through dense trees and over obscuring hills (no line of sight) and is connected to 6 tv tuners. Signal strength on all these 6 tuners is close to 100%.

 

I have enough antenna bits and pieces to reconstruct the dab/fm antenna which is really want I'm asking for; small enough to connect to only two dab/fm tuners and obviously set vertically.

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Thanks Muon M' for the info, but I reckon I've been through these.

I have several damaged old tv antennas, with broken and missing elements. Rebuilding one to receive both fm and dab is my aim. Boom length with a director, collector and reflector dimensions and spacings is the info I can't find.

 

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56 minutes ago, Muon N' said:

I just think of all the 'new' digital antennas sales, and the many perfectly fine antennas that are now in land fill.

 

Edit: so i guess, if the antenna you have is only VHF compatible then you need one that covers both VHF and UHF regardless if it is called analogue or digital

OP wants to pick up radio, not TV.

 

11 minutes ago, Greg Pain said:

Rebuilding one to receive both fm and dab is my aim

Bob has the good oil.   DAB is on VHF 9A vertical .... it might also get FM ok.

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