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Old 22nd Jul 2019, 1:38 pm   #661
Jonster
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Here's on local to me in Pevensey Bay, East Sussex, B1, 3 and 5 together, all seen better days! B3 VHF pointing to Dover, UHF to Heathfield.
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Old 22nd Jul 2019, 2:18 pm   #662
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Default Re: 405-Line VHF Aerials 2013 to the present day.

The remains of the band 1 elements
look a bit short for Crystal Palace Ch1,
probably for the Eastbourne relay on Ch 5.
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Old 1st Aug 2019, 9:43 am   #663
Heatercathodeshort
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Travelling back from Dulwich yesterday I spotted this interesting channel 1/9 aerial in Aberdeen Road Croydon.

It's surprising how many 405 aerials remain in this area literally within touching distance of CP and BH. I guess that being so close to the transmitter, the co-ax screening not being very efficient back then, would probably lead to ghosting and other odd effects. Being too close was probably as bad as being too far away! Regards, John.
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Old 1st Aug 2019, 12:57 pm   #664
Jonster
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Default Re: 405-Line VHF Aerials 2013 to the present day.

The high gain and narrow vertical beamwidth of the transmission antennas meant that areas in the immediate shadow of the mast often received poor pictures. See here for an explanation of the 'Penge Effect'

https://www.bbceng.info/Install/Tran...pub-effect.PDF
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Old 1st Aug 2019, 1:03 pm   #665
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Initial very local coverage of UHF from Winter Hill was a problem, it was resolved in the area I worked but not sure how Horwich, which is under the mast, faired.
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Old 1st Aug 2019, 1:42 pm   #666
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Default Re: 405-Line VHF Aerials 2013 to the present day.

I have some relatives in the Melton Mowbray area & their picture from Waltham was never brilliant, especially my Aunt & Uncle's in Great Dalby.
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Old 1st Aug 2019, 5:18 pm   #667
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Quote:
Originally Posted by Heatercathodeshort View Post
Travelling back from Dulwich yesterday I spotted this interesting channel 1/9 aerial in Aberdeen Road Croydon..
Lovely!

A friend used to refer to those as "Fishbone" antennas, for obvious reasons.
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Old 1st Aug 2019, 5:25 pm   #668
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Spotted today in Newbury, just off what everyone locally calls the "Halfords roundabout".

Pointing down the valley to London, the BI antenna has lost its dipole but the director remains.

The side-by-side BIII antenna is a nice example of a "Slot-fed" double-Yagi with 'delta' matching back to the feedpoint.

The coax from the BIII feedpoint has come away from the boom/mast and now trails sadly over the lower part of the 'slot' element.

It's a rather well-constructed setup, with a big beefy clamp from the BI boom to the mast and paired paralleled arms supporting the two booms of the BIII array from the BI boom. I wonder if perhaps this design was originally BI-only and the BIII elements were retrofitted when ITV came available?
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Old 2nd Aug 2019, 10:54 am   #669
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Default Re: 405-Line VHF Aerials 2013 to the present day.

I had a customer that lived almost directly under the Stockland Hill mast and had a dreadful signal.

Peter
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Old 2nd Aug 2019, 11:31 am   #670
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Re post no. 668:

The Band III looks like a J-Beam design - except that I've never seen that mounting method used for J-Beam. No sure about the Band I maker, except that the substantial mounting clamp could also be a J-Beam design.
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Old 12th Sep 2019, 9:31 pm   #671
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Photographed in Lynton, Devon today.
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Old 13th Sep 2019, 9:32 am   #672
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Glad to see it is still there. I took a picture of this some years back. I think the problem in the Lynmouth/Lynton area was not to little but to much and to many signals. There is a clear 30 mile path across the Bristol Channel to both the high powered 405 line transmitters at Wenvoe on ch5 and St Hilary on ch10.
Because of these strong signals and the surrounding hills and cliffs multi path or ghosting was a severe problem on both channels. It was a nightmare for local aerial riggers who tried different types of aerials to try and overcome or reduce the ghost problem.
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Old 13th Sep 2019, 9:19 pm   #673
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Quote:
Originally Posted by shortwaverx View Post
Photographed in Lynton, Devon today.
That really is a beauty. Never seen one like that before. J-Beam obviously.
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Old 13th Sep 2019, 9:37 pm   #674
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Default Re: 405-Line VHF Aerials 2013 to the present day.

What a fascinating design.... I really can't figure it out properly! Is it just a BI design or is the 'skeleton slot' also supposed to provide some form of directionally-confused BIII coverage ??

It still seems to be a case of dipole-and-director [the director appears to have adjustably-extensible ends] which is a less-than-optimal design as far as gain and directivity/anti-ghosting is concerned.
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Old 13th Sep 2019, 10:02 pm   #675
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Default Re: 405-Line VHF Aerials 2013 to the present day.

J-Beam HornBeam, see pages 418/419
https://americanradiohistory.com/Arc...ld-1956-09.pdf
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Old 13th Sep 2019, 10:17 pm   #676
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Default Re: 405-Line VHF Aerials 2013 to the present day.

Guest who fitted a few of them , called Hornbeam made by Jay beam
The band 1 rods are adjustable held in place by a set screw . The lasting kit had
a bolt and sort of gear armament that was operated with a alan key . Did not fit
many as this type of lashing kit was time consuming
Derrick
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Old 13th Sep 2019, 10:25 pm   #677
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Default Re: 405-Line VHF Aerials 2013 to the present day.

How well did they work?
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