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Old 16th Nov 2020, 1:24 am   #721
colly0410
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Default Re: 405-Line VHF Aerials 2013 to the present day.

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Originally Posted by SteveCG View Post
Re "3rd harmonic trick": Belling and Lee sold an 'H' design with sloping elements - like an arrow - for the Midlands area that was receiving BBC on CH B4 and ITA on CH B8, and this relied upon the 3rd Harmonic. Otherwise I agree with G6Tanuki that some Band I and Band III channel combinations were better suited than others for the style of combined aerial featured in post no. 651.
My parents who lived in Bestwood Village just north of Nottingham had one of these sloping element bent H jobs for Sutton Coldfield/Litchfield & it worked really well - as good as next doors X plus 5. Was the bending/sloping of the elements done for a reason? Or just a gimmick so it looked different to an ordinary H?
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Old 16th Nov 2020, 8:18 am   #722
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Default Re: 405-Line VHF Aerials 2013 to the present day.

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I had my chimney rebuilt as it had big cracks in it, there was a bracket and wire strap round it, probably all that was holding it together, and I thought to myself bet that held a VHF aerial at sometime and someone on here will be able to name the manufacturer

Pics can be viewed here ******************************BUE5RhVRA3kqiAed7
Looks like an Antiference bracket to me, used to mount an Antex X aerial or Antex X and Band 3 combined. Seeing its going on 60 years since I helped install those someone on the forum my know better.
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Old 16th Nov 2020, 10:37 am   #723
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Recently spotted on the unused outbuildings of a hotel in Basingstoke, the band 3 aerial points approx NW with the UHF aligned to Hannigton perhaps.
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Old 16th Nov 2020, 5:19 pm   #724
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Default Re: 405-Line VHF Aerials 2013 to the present day.

I've not seen a bracket like that before; all the ones I recall used U-bolts to attach the mast to the 'legs'.

It does look rather robust!

"Back in the day" along my part of the Wales/Shropshire border it was quite common to see two 2-armed mitre-brackets one above the other, meaning 4 U-bolts to secure the mast (which generally held a 3-ele BI for Sutton Coldfield, and a couple of 5- or 7-ele BIII, one for Granada off Winter Hill, the other for Lichfield ATV)
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Old 19th Nov 2020, 6:30 pm   #725
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Spotted overlooking Hungerford high-street this afternoon.

The BI "H" points south to Rowridge; the little BIII horizontally-polarised antenna with its director missing points at Membury, which is only a few miles away.

The coax feeders swing freely in the breeze on their way to a diplexer mounted on the vertical mast.
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Old 19th Nov 2020, 7:51 pm   #726
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Default Re: 405-Line VHF Aerials 2013 to the present day.

This little BIII antenna is on a chimney in Marlborough. it points due East, down the valley to Membury. I think it [and its UHF buddy] were once a bit higher up - the mast looks to have slid down through the chimney-lashing bracket and it's the BIII reflector that's catching on the chimney thats stopping it sliding down further.

There's another similar one on a house about 50 Metres away but I couldn't get a shot of it from where I was stopped.
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Old 20th Nov 2020, 9:27 am   #727
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Quote:
Originally Posted by colly0410 View Post
Was the bending/sloping of the elements done for a reason? Or just a gimmick so it looked different to an ordinary H?
Bending of elements into a chevron shape is done to broaden the bandwidth of the array.
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Old 21st Nov 2020, 12:39 pm   #728
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Hi. I attach a picture of a 3 element yagi dated 1952. It's at Bridlington, posted in "Bridlington Past and Present" a Facebook group. Can anyone here identify the antenna, the channel it could have been receiving, and what transmitter it is pointing to? That road is pretty much parallel to the coast so it's roughly north south, north at top. Thank. EDIT. Hope this post is kosher, considering the thread title.
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Old 21st Nov 2020, 1:38 pm   #729
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Great picture. I can guess it must have been Holme Moss channel 2 given the year. John.
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Old 21st Nov 2020, 3:05 pm   #730
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Default Re: 405-Line VHF Aerials 2013 to the present day.

It surprises me that Bridlington would rely on Holme Moss so far away (60 miles). Never realised that Holme Moss served places quite large distances from it. One learns something new.
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Old 21st Nov 2020, 3:19 pm   #731
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Coverage map for Holme Moss, Bridlington appears to be listed as 100μv/m.
Another BBC doc suggests between 200 and 500 μv/m.
http://downloads.bbc.co.uk/rd/pubs/reports/1954-02.pdf
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Old 21st Nov 2020, 3:32 pm   #732
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Default Re: 405-Line VHF Aerials 2013 to the present day.

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It surprises me that Bridlington would rely on Holme Moss so far away (60 miles). Never realised that Holme Moss served places quite large distances from it. One learns something new.
In 1952 there only was Holme Moss available.
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Old 21st Nov 2020, 3:41 pm   #733
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Default Re: 405-Line VHF Aerials 2013 to the present day.

The Engineers pocket book edition copy I have is 1960 and there were still plenty areas without a decent TV signal shown in the coverage maps
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Old 21st Nov 2020, 4:31 pm   #734
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Re: post no. 725,

The BI aerial is made by J-Beam (later known as Jaybeam). G6Tanuki can you confirm that the aerial does indeed point southwards to Rowridge and so would be a Channel 3. The reason I ask is because its proportions look like a Channel 1 (for Crystal Palace).

Incidently, later on Hungerford had a BBC relay on Channel 4, 25 Watts, horizontal polarization.
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Old 22nd Nov 2020, 3:06 pm   #735
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Default Re: 405-Line VHF Aerials 2013 to the present day.

The Holme Moss transmitter covered a large area. It was one of the first five main BBC transmitters. David tells me they received reasonable pictures in Newcastle.
There were quite a number of receivers that would have given a good picture at 100 micro/v metre. J.
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Old 22nd Nov 2020, 3:48 pm   #736
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Holme Moss was receivable in some parts of the North-East of England. I had a customer who told me his first set was tuned into the HM transmitter. The location was a farm house near the military road ten miles from the west end of Newcastle.

DFWB.
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Old 22nd Nov 2020, 4:27 pm   #737
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Holme Moss was receivable in Bangor as we had a choice of BBC north and BBC Wales from Llandonna.

Slightly off topic when I lived in Beaumaris We got better UHF TV from Winter Hill than the local Llandonna transmitter.

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Old 22nd Nov 2020, 4:38 pm   #738
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Re: post no. 728

Since Holme Moss had only been on air for a short while compared to the date of the 'photo I wonder whether it was taken because of the 'magic' of TV in those days?

I suspect the aerial was a Belling & Lee - but am not entirely sure. Certainly the fact that the folded dipole is parallel to the boom was a Belling & Lee trait.

I agree that 100 uV/m would have given a reasonable picture on a fringe set - provided there was not too much 'old bangor' ignition interference !
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Old 22nd Nov 2020, 7:59 pm   #739
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Default Re: 405-Line VHF Aerials 2013 to the present day.

That small angle support seems strange, I don't think it is Belling-Lee and I didn't think that they used a folded dipole. What about Telerection or Aerialite?
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Old 23rd Nov 2020, 1:15 am   #740
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Some similar aerials with an angled support only on the lower side are shown in a Belling & Lee aerial leaflet for August 1952. One is the "Multirod" four (straight) element array for fringe reception, said to be designed to withstand 80mph wind gusts. Not the one in the photo, which only has three elements, and none of the others have folded elements.

Last edited by emeritus; 23rd Nov 2020 at 1:24 am.
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