Talk:Crystal Palace transmitting station

message: There should be an article about the nearby Croydon Transmitter, which is a similar height and design, but stands on a slightly lower elevation. Lee M 01:34, 2 Dec 2004 (UTC)
thread_title: Comment

message: According to some maps and Microsoft AutoRoute 2006 the Crystal Palace Transmitter is in the London Borough of Bromley.  
   LONDON UK    •  (UTC) • 15:17, 17 August 2006 (UTC)
replies: text: I've now researched this, and the tower is definitely located in the borough of Bromley.  This map from the Croydon Council website clearly shows Croydon borough ending at the junction of Church Road and Westow Hill.  The tower is approximately 500 m to the north east of the junction, on the south side of Crystal Palace Road, which forms the boundary between Bromley to the south and Southwark to the north. Chillysnow 22:42, 12 October 2006 (UTC)
replies: text: And for confirmation there is a Bromley Council sign outside of the transmitter.  The boundary here runs along the Crystal Palace Parade main road. Regan123 15:44, 21 March 2007 (UTC)
thread_title:  Bromley 

message: Back in the mists of time we had a big discussion about what to call all dozens of UK 'transmitter' articles, which were variously called transmitters, TV towers, TV masts, television towers, broadcasting stations etc., and we settled on 'transmitting station' as being the best, all things considered. That is why I am reverting the page move to that 'status quo' version. If anyone wants to change the name of this article, it needs to be done consistently many similar articles, so please discuss it at Category_talk:Transmitter_sites_in_the_United_Kingdom first.--Harumphy (talk) 11:25, 13 October 2008 (UTC)
thread_title:  Article name 

message: So who owns and runs the transmitter facilities - the article mentions BBC & Five programming broadcast but that does not confirm my guess that it is owned and operated by the BBC itself ? David Ruben  Talk  15:27, 13 June 2010 (UTC)
thread_title: Ownership

message: There needs to be a style on whether these are written as e.g. BBC1 or BBC One.  — Preceding unsigned comment added by 80.189.103.145 (talk) 09:47, 3 April 2012 (UTC)
thread_title: BBC station-names

message: There can be amendments in the coming days because of analogue switchoff of BBC2 tomorrow and of BBC1, ITV and C4 on the 18th of this month.  — Preceding unsigned comment added by 80.189.103.145 (talk) 09:57, 3 April 2012 (UTC)
thread_title: analogue switchoff

message: Does anybody know where a copy of the 16mm film made by BICC which was available from BICC Film Library can be located? Tonysidcup (talk) 15:00, 19 July 2013 (UTC)
replies: text: It's on this DVD: http://www.crystalpalacefoundation.org.uk/shop/john-logie-baird-tv/the-pleasure-garden-the-phoenix-tower Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 13:20, 22 July 2013 (UTC)
thread_title:  Construction Film 

message: Surely the base area is 120 feet square, not 120 square feet?  re/greg/ex;{mbox|history} 14:13, 8 October 2013 (UTC)
replies: text: Thanks! Citation added.  re/greg/ex;{mbox|history} 17:09, 12 October 2013 (UTC)
thread_title:  Dubious 

message: Is that the same as British Insulated Callender's Cables? Harfarhs (talk) 21:05, 24 July 2016 (UTC)
thread_title:  British Insulated Callender's Construction Co Ltd 

message: Hello fellow Wikipedians,
I have just modified one external link on Crystal Palace transmitting station. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20111019103007/http://www.linnean.org/fileadmin/images/Linnean/Linnean_Archive/Linnean_21-2_April_2005.pdf to http://www.linnean.org/fileadmin/images/Linnean/Linnean_Archive/Linnean_21-2_April_2005.pdf
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 09:14, 30 November 2017 (UTC)
thread_title:  External links modified 

message: On 21 March 2018 Com7 and Com8 moved to UHF channels 55 and 56 respectively and the local London multiplex moved to UHF channel 35, vacated by Com8, as part of the national strategy to clear the 700 MHz band for re-use by mobile phone companies. Don't know if any ERPs changed. It seems counter-intuitive to move two muxes both out of the A group and into the band that is supposed to be being cleared but the, at least interim, goal is to convert them to national single frequency networks on channels 55 and 56 respectively. Who knows what will happen to them when UHF channels 55 and 56 have to be cleared in 2020? Will they be moved back in group, or will they be closed permanently? How many households in the Crystal Palace reception area will waste money on a wideband aerials? 188.29.164.81 (talk) 18:05, 21 March 2018 (UTC)
replies: text: 11 million people could waste money on a new aerial, but who knows how many will know the reason that Cbeebies HD / BBC News HD etc. disappeared? COM7 / COM8 used to fit in Group A before last week, so presumably could be "put back", but maybe the playing field will have changed by 2020 (change MUXs to DVB-T2, assume some natural churn in the channel assignments?) WikiWikiPhil (talk) 00:53, 27 March 2018 (UTC)
replies: text: The digitaluk.co.uk coverage checker page is showing an event dated 18 April 2018 in connection with the local London mux provided by Crystal Palace: "COM power-up" though there's no explanation as to what it means. I can't find any other reference to it. 83.104.249.240 (talk) 17:02, 27 April 2018 (UTC)
thread_title:  2018 frequency changes 

message: The article says "Although DTT requires far less power to achieve the same coverage as analogue TV, this 17 dB difference is too large to ensure comparable coverage." 17 dB suggests a power ratio of 1017/10, or approximately 50. The original analogue ERP was 1 MW and the post-switchover ERP is 200 kW (both given but uncited earlier in the paragraph), which is a ratio of 5 or 10 × log10 5 ≈ 7 dB. So much for the mathematics, what then of the uncited assertion that "The station therefore has a range of about 30 miles (50 km) for DTT, compared with about 60 miles (90 km) for analogue."? Was this based on the false value of 17 dB or the actual value of 7 dB? Perhaps someone who understands UHF propagation better than me could comment. Maybe, as a first approximation, it's sufficient to say that it follows the inverse square law and since √5 is very approximately equal to 2 the range is approximately halved. If that is the case the correction would simply be to replace 17 dB with 7 dB and find a citation.
The manual conversions from miles to kilometres were inaccurate so I've replaced them with Template:Convert. 83.104.249.240 (talk) 18:07, 27 April 2018 (UTC)
replies: text: I have done some research and found citations to support your mathematics, which have turned out to be correct.  It turns out that whoever wrote the section about coverage mistakenly compared the pre-digital-switchover transmission power of 20 kW to the analogue power of 1 MW, which is where the 17dB figure comes from.  The post-digital-switchover power is 200 kW which is indeed 7dB lower than analogue as you correctly calculate.  I have also found a source that clearly states analogue and post-DSO coverage is expected to be comparable, so the assertion that the new coverage range has shrunk from 60 miles to 30 miles is just plain wrong.  I will now make the appropriate amendments with citations. Chillysnow (talk) 15:51, 28 March 2023 (UTC)
thread_title:  17dB?