|
General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
|
Thread Tools |
22nd Mar 2019, 3:05 pm | #61 |
Heptode
Join Date: May 2008
Location: Selby, North Yorkshire, UK.
Posts: 951
|
Re: The twin towers of Emley Moor
There were a number of structural issues with the original design. The remaining sites with this design, at Winter Hill and Belmont, have had a number of techniques used to reduce the risk of a further collapse.
While most of these have involved the use of chain dampers inside the structure to reduce oscillations, at Belmont it was found that this was impractical due to the internal fixtures. So an alternative system was developed which involved sealing the tubular structure to allow it to be filled with helium. So now the stay cables are there to hold the mast down, not up. ;-)
__________________
I got food in ma belly and a license for ma telly My Blog - http://g7mrv.blogspot.com |
22nd Mar 2019, 3:10 pm | #62 | |
Heptode
Join Date: May 2008
Location: Selby, North Yorkshire, UK.
Posts: 951
|
Re: The twin towers of Emley Moor
Quote:
__________________
I got food in ma belly and a license for ma telly My Blog - http://g7mrv.blogspot.com |
|
22nd Mar 2019, 5:50 pm | #63 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: The twin towers of Emley Moor
Quote:
Lawrence. |
|
22nd Mar 2019, 6:32 pm | #64 |
Dekatron
Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,273
|
Re: The twin towers of Emley Moor
__________________
Kevin |
23rd Mar 2019, 11:22 am | #65 |
Dekatron
Join Date: Jul 2008
Location: Charmouth, Dorset, UK.
Posts: 3,601
|
Re: The twin towers of Emley Moor
I remember it coming down, I believe there was a film about its reconstruction, in fact I'm sure there was. Wasn't a colour test film was it?
Peter |
23rd Mar 2019, 11:47 am | #66 |
Dekatron
Join Date: Jan 2006
Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex.
Posts: 5,817
|
Re: The twin towers of Emley Moor
Thanks for the links Bill and Kevin [posts 60+64*]. Now I get the references!
Dave W |
21st Jun 2019, 10:33 am | #67 |
Pentode
Join Date: Mar 2013
Location: Leeds, West Yorkshire, UK.
Posts: 246
|
Re: The twin towers of Emley Moor
Saw the transmitter mast yesterday (only 1 now ?)
|
21st Jun 2019, 10:40 am | #68 |
Heptode
Join Date: May 2008
Location: Selby, North Yorkshire, UK.
Posts: 951
|
Re: The twin towers of Emley Moor
Unless there was a major disaster over night (and I wasn't called!), there are most definitely two!
It much depends where you were looking from. At a distance, and certain directions, the temporary mast is all but invisible! I lose sight of the temporary mast even as close as the Wakefield/Dewsbury junction of the M1!
__________________
I got food in ma belly and a license for ma telly My Blog - http://g7mrv.blogspot.com |
21st Jun 2019, 1:41 pm | #69 |
Nonode
Join Date: Aug 2007
Location: South Bradford, West Yorkshire, UK.
Posts: 2,573
|
Re: The twin towers of Emley Moor
Yes just looked out of the back window and there are definitely two towers.
Keith |
21st Jun 2019, 1:52 pm | #70 |
Heptode
Join Date: May 2008
Location: Selby, North Yorkshire, UK.
Posts: 951
|
Re: The twin towers of Emley Moor
Thats a relief! Otherwise i'd be in for one heck of a nightshift!
__________________
I got food in ma belly and a license for ma telly My Blog - http://g7mrv.blogspot.com |
21st Jun 2019, 1:56 pm | #71 |
Nonode
Join Date: Aug 2007
Location: South Bradford, West Yorkshire, UK.
Posts: 2,573
|
Re: The twin towers of Emley Moor
You can sleep easy tonight
Keith |
4th Jun 2020, 4:31 pm | #72 |
Hexode
Join Date: Oct 2007
Location: Ossett, West Yorkshire, UK.
Posts: 406
|
Emley Moor Masts
Having read loads of interesting posts about the masts at Emley Moor I thought I'd post this photo taken on a lockdown drive around the area. Noting how much higher the temporary mast is I wondered if any of the network of relay stations could have been shut down during the renovations?
David |
4th Jun 2020, 6:38 pm | #73 |
Heptode
Join Date: Jan 2006
Location: Todmorden, West Yorkshire, UK.
Posts: 870
|
Re: The twin towers of Emley Moor
Not in the Todmorden area. Still can't receive signals direct from Emley Moor so I have to make do with Freeview "Lite" (supplemented by TV via the internet). Most people in this town use satellite dishes for TV - Freesat presumably as they are unhappy with the second-rate service provided by terrestrial Freeview relays.
|
4th Jun 2020, 7:04 pm | #74 |
Octode
Join Date: Nov 2004
Location: Hebden Bridge, West Yorkshire, UK.
Posts: 1,885
|
Re: The twin towers of Emley Moor
I think that might be an illusion - Wikipedia (not necessarily correct) has the temporary mast as being shorter. From here (Hebden Bridge) the mast tops look to be at a similar height. Besides everyone would need to turn their aerials and re-tune so a bit of a non-starter!
|
4th Jun 2020, 8:38 pm | #75 |
Nonode
Join Date: Aug 2007
Location: South Bradford, West Yorkshire, UK.
Posts: 2,573
|
Re: The twin towers of Emley Moor
The two main relays, Idle and Keighley are fed via a fibre optic link from Emley so would be unaffected by any breaks in off air signals.
We're 12miles, literally line of sight, from Emley and the temporary mast looks taller -just. Keith |
4th Jun 2020, 9:38 pm | #76 |
Nonode
Join Date: May 2004
Location: Halifax, West Yorkshire, UK.
Posts: 2,587
|
Re: The twin towers of Emley Moor
There is an actual difference in the height of the masts at the moment because of the ongoing work on the top (aerial) part of the permanent tower. However, this does not wholly explain the very large discrepanency apparent in David's photo which has more to do with human perception than anything else.
The attached brainless camera image illustrates the point. When we look at the lamp posts our clever little brains 'know' that the posts are likely to be the same height and interpret the flat image accordingly even though the posts nearer to the viewing point are actually much longer. However, when we look further into what we 'know' is the distance the situation becomes much less clear with the towers especially as they have different physical attributes. In David's picture this becomes even more confusing as it looks like the two towers are much closer together than they really are. When viewed in 3D by human eyes/brain from afar (about 15 miles in my case) the two towers looked to be the same height, as stated by Wikipedia, before work started on dismantling the permanent tower's top section. Alan |
5th Jun 2020, 3:39 pm | #77 |
Heptode
Join Date: Feb 2008
Location: Great Barr, Sandwell, West Midlands, UK.
Posts: 589
|
Re: The twin towers of Emley Moor
As part of an RF Safety course we went up the tower, climbed up through what was then the stand-by antenna (below the main antenna) and poked a Nardalert on a stick through the hatch into the main antenna. I was amazed it didn't alert until it was through the open hatch. Says a lot for the antenna directivity. Nardalerts were routinely worn when working on antenna support structures to warn you of excessive RF fields. They didn't always alarm close to antennas, I have had alerts well below any antennas which I presume are some sort of resonant points in a steel structure itself?
Here's a nice video of one of my ex-colleagues describing the tower... https://www.youtube.com/watch?v=rmP4iFEQvkQ&list=WL Martin G4NCE Last edited by Sparky67; 5th Jun 2020 at 3:45 pm. |
7th Jun 2020, 1:51 pm | #78 | |
Octode
Join Date: Mar 2015
Location: Yorkshire, England.
Posts: 1,303
|
Re: The twin towers of Emley Moor
Quote:
The windows are NOT canted, which makes me think that the flaring of the structure enabled me to see the base of the tower. To be honest, it made my stomach turn!
__________________
Regards, Ken. BVWS member |
|
7th Jun 2020, 6:21 pm | #79 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
|
Re: The twin towers of Emley Moor
This was taken on the roof of the observation deck years ago. Me with the untimely capture, and three colleagues. Film, so no multiple takes then.
|