UHF/VHF TV Aerial

Submitted: Monday, Apr 27, 2015 at 21:34
ThreadID: 117645 Views:2038 Replies:3 FollowUps:2
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I need to get a tv aerial for my off road motorhome. I would like to permanently mount it but want something with a low profile. I have seen Jaycar sell the Digitech UHF/VHF TV Aerial LT 3143. It has a remote rotation motor and seems to accommodate both the horizontal and vertical axis, which I understand is needed for digital reception in different parts of the world. Has anyone got one and if so, what do you think of its reception qualities? Has anyone used it on 12 VDC or does it need 240 volts adapted down to 12 VAC? The remote control and rotation is very useful as it will save me climbing up to tune it.
What other low profile alternatives should I consider?
Many thanks.
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Reply By: Eric Experience - Tuesday, Apr 28, 2015 at 20:00

Tuesday, Apr 28, 2015 at 20:00
Phil
I use a patch antenna on my off road motor home, it works very well on all TV channels. A patch antenna is a metal plate sitting flat on the roof but insulated from it. The dimensions are chosen to be 1/4 wave length at the lowest channel in one dimension then 1/4 wave length at the highest channel on the other dimension. The coax connection is placed about 1/4 the way in diagonally from any corner that gives you about 75 ohms. Eric.
AnswerID: 553036

Follow Up By: PhilD - Tuesday, Apr 28, 2015 at 21:58

Tuesday, Apr 28, 2015 at 21:58
Thanks for the info. Did you make yours or where did you buy it from?
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FollowupID: 838789

Reply By: Eric Experience - Wednesday, Apr 29, 2015 at 20:07

Wednesday, Apr 29, 2015 at 20:07
Phil.
I made it, I do not know of anybody who makes them as a business. They are simple to make. Eric.
AnswerID: 553072

Follow Up By: PhilD - Wednesday, Apr 29, 2015 at 20:14

Wednesday, Apr 29, 2015 at 20:14
I generally understand the concept but would you be willing to let me have the exact details of materials and dimensions? I am happy to make one, but the design part is currently outside my knowledge base! Thanks.
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FollowupID: 838820

Reply By: Eric Experience - Wednesday, Apr 29, 2015 at 21:26

Wednesday, Apr 29, 2015 at 21:26
Phil.
The size I used is not the optimal size because it is the lid of my air scoop. It is 500x600 ally. it rests on a 16mm high foam rubber gasket, The coax outer is connected to the steel roof and the inner is connected to the ally sheet about 100 mm in from one corner. Eric.
AnswerID: 553075

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