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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old Yesterday, 12:53 pm   #21
Panrock
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Default Re: British Heritage Television

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Originally Posted by Hybrid tellies View Post
At the moment its mounted for horizontal polarization but could be mounted for vertical if required.
One thing I can say is our transmissions will be vertically polarised. This is because our project is not only about transmitting a radio signal but also concerned with heritage. All the early high power BBC Band I stations were vertically polarised and the vertical H and X aerials came to be seen as (for want of a better word) "iconic".

Steve
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Old Yesterday, 5:21 pm   #22
Ian - G4JQT
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Default Re: British Heritage Television

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Originally Posted by Panrock View Post
Quote:
Originally Posted by Hybrid tellies View Post
At the moment its mounted for horizontal polarization but could be mounted for vertical if required.
One thing I can say is our transmissions will be vertically polarised. This is because our project is not only about transmitting a radio signal but also concerned with heritage. All the early high power BBC Band I stations were vertically polarised and the vertical H and X aerials came to be seen as (for want of a better word) "iconic".

Steve
Was that originally done for signal propagation reasons (which is odd as horizontal polarisation was chosen for VHF radio), or because horizontal 41- 45 MHz antennas were a bit unwieldy?
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Old Yesterday, 7:16 pm   #23
Panrock
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Default Re: British Heritage Television

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Originally Posted by Ian - G4JQT View Post
Was that originally done for signal propagation reasons (which is odd as horizontal polarisation was chosen for VHF radio), or because horizontal 41- 45 MHz antennas were a bit unwieldy?
To ask why vertical polarisation was used for the first television stations in the UK (but not necessarily elsewhere) makes a very interesting question - perhaps justifying a new thread and comments from the historians here.

We read HERE that despite interference results (and propensity for 'ghosting' too?) to the contrary, vertical polarisation was chosen to avoid 'inconvenience'. Certainly, the horizontal 10 ft-odd long aerials needed for Channel B1 would have very droopy.

Steve
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Old Yesterday, 7:47 pm   #24
akuram1
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Default Re: British Heritage Television

I know this from personal experience as they were used by our local fill-in transmitter around 1965. Quite a bit bigger than channel 3 which was our normal.
Happy days sitting on a roof with the snow swirling through the wind fixing the lashings.
Three or four element band 1 were great fun.
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Old Yesterday, 10:27 pm   #25
FERNSEH
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Default Re: British Heritage Television

In the North-East of England the BBC1 Weardale 405 line relay transmitter operated on channel 1 with horizontal polarising. In use from 1966 to 1985.
Never seen any Ch1 aerials later and it's likely never will now.

DFWB.
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Old Yesterday, 10:56 pm   #26
akuram1
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Default Re: British Heritage Television

Perth still has loads of channel 3 aerials, why I don’t know since as you say they have been redundant since 1985. Some of these have been up since Kirk of Shotts started and must be a bit dangerous now.
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Old Today, 1:43 am   #27
rambo1152
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Default Re: British Heritage Television

We ended up with a fairly even mix of V & H BI Tx's
https://www.bvws.org.uk/405alive/info/tx_list.html
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