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No reflector on new TV antenna



 
 
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  #11  
Old May 16th 17, 08:36 PM posted to uk.tech.digital-tv
Ian Field
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Posts: 157
Default No reflector on new TV antenna



"Brian Gaff" wrote in message
news
Is it perchance a log periodic?


They're allegedly better - some cheap installers put up the old type with a
very conspicuous reflector because; "they look the part".

  #12  
Old May 17th 17, 07:48 AM posted to uk.tech.digital-tv
Brian Gaff
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Posts: 6,879
Default No reflector on new TV antenna

Besides the local pigeons like the reflector as they can bounce on it till
it drops off, no doubt the plastic is rotted by guano.
Brian

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"Ian Field" wrote in message
...


"Brian Gaff" wrote in message
news
Is it perchance a log periodic?


They're allegedly better - some cheap installers put up the old type with
a very conspicuous reflector because; "they look the part".



  #14  
Old May 17th 17, 09:28 AM posted to uk.tech.digital-tv
[email protected]
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Posts: 265
Default No reflector on new TV antenna

On Wed, 17 May 2017 07:48:26 +0100
"Brian Gaff" wrote:
Besides the local pigeons like the reflector as they can bounce on it till
it drops off, no doubt the plastic is rotted by guano.


So why are ones without a reflector installed now, is it simply cost?

--
Spud

  #16  
Old May 17th 17, 11:29 AM posted to uk.tech.digital-tv
David Woolley[_2_]
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Posts: 532
Default No reflector on new TV antenna

On 17/05/17 11:04, David Woolley wrote:
The Yagi design, which typically has a reflector, can only handle a
narrow range of channels, but can do so better for a given physical
size. Nowadays, the range of channels keep being changed, and there are
often outlier channels that are not compatible with an aerial designed
for the main group.


I should possibly point out that the channels that I am talking about
are the pre-digital switchover channels. In the digital world, these are
called multiplexes. Whilst the number available in an area will vary,
the number of active ones is probably mainly between 6 and 10. The
Freeview channel numbers are split between these multiplex channels, but
which multiplex is used for which Freeview channel is more of a
commercial than a technical decision.
  #20  
Old May 17th 17, 12:23 PM posted to uk.tech.digital-tv
Brian Gaff
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Posts: 6,879
Default No reflector on new TV antenna

Well of course they did.
I have a group B two stacked parabeam aray in my shed used originally for
hannington from Chessingt9on to obtain different film choices when the itv
regions did in fact screen other films to each other. I also hav an
Antiference log that is 21 to 68 channels but only has 89.5db gain on
average. It is after all just a string of different sized dipoles in anti
pase and those off resonance tend to act parasitically on those that are.
Brian

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wrote in message news
On Wed, 17 May 2017 12:01:29 +0100
David Woolley wrote:
On 17/05/17 11:55,
d wrote:
But I thought the UHF range of Freeview was actually less than that of
the
old PAL broadcasts since the government had sold off part of the
spectrum?


Originally, channels were grouped, so that, for instance, London only
got low numbered channels. As a result, although the total available
frequency range was larger, the range needed in any one place was a lot
smaller.


Are you saying that rooftop antenna centre frequencies varied between
regions?

--
Spud



 




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