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aus+uk / uk.tech.digital-tv / Re: Answer for Bill

Answer for Bill

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From: nom...@home.org (The Other John)
Newsgroups: uk.tech.digital-tv
Subject: Answer for Bill
Date: Thu, 19 May 2022 14:28:24 -0000 (UTC)
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by: The Other John - Thu, 19 May 2022 14:28 UTC

Follow up to my aerial problem.
The slack 40+ year old coax drapes down the wall and goes through a hole
into a built-in cupboard in bedroom 1 where it's plugged into a passive
splitter which feeds bedroom 4 (computer room) and downstairs to lounge.
I have an indoor aerial bought long ago for a portable TV. It's in the
form of a halo - circular plastic ring holding a metal ring with a gap at
the bottom where the coax is connected. It has a fold out stand at the
bottom. I wondered if having a bottom feed would make it horizontally
polarised like a folded dipole but plugging it into the splitter and
scanning the output in the lounge revealed it's happy with Reigate's VP TX
and the level of UHF channels 23 and 24 are much better than with the
yagi, see:

<https://www.dropbox.com/s/5s1a0pjjeae26kt/
Scan%20468.0-592.0MHz%20indoor.png?dl=0>

So I don't need a new aerial after all. :)

--
TOJ.

Re: Answer for Bill

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From: dav...@ex.djwhome.demon.invalid (David Woolley)
Newsgroups: uk.tech.digital-tv
Subject: Re: Answer for Bill
Date: Thu, 19 May 2022 17:45:25 +0100
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by: David Woolley - Thu, 19 May 2022 16:45 UTC

On 19/05/2022 15:28, The Other John wrote:
> It's in the
> form of a halo - circular plastic ring holding a metal ring with a gap at
> the bottom where the coax is connected. It has a fold out stand at the
> bottom. I wondered if having a bottom feed would make it horizontally
> polarised like a folded dipole

If the feeder is simply connected across the gap in the loop, with
nothing else there, it is probably being fed against the braid of the
cable, i.e. the cable outer is actually part of the aerial. That might
well result in significant vertical polarisation, whereas, if there were
a true balanced feed, it would have to be horizontal.

Re: Answer for Bill

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From: nom...@home.org (The Other John)
Newsgroups: uk.tech.digital-tv
Subject: Re: Answer for Bill
Date: Thu, 19 May 2022 18:15:12 -0000 (UTC)
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by: The Other John - Thu, 19 May 2022 18:15 UTC

On Thu, 19 May 2022 17:45:25 +0100, David Woolley wrote:

> If the feeder is simply connected across the gap in the loop, with
> nothing else there, it is probably being fed against the braid of the
> cable, i.e. the cable outer is actually part of the aerial. That might
> well result in significant vertical polarisation, whereas, if there were
> a true balanced feed, it would have to be horizontal.

There's a plastic box in the base where the cable comes out so it might
have a balun built in.

--
TOJ.

Subject	Author
Answer for Bill	The Other John
Re: Answer for Bill	David Woolley
Re: Answer for Bill	The Other John