menuMENU    UK Free TV logo Freeview

 

 

Click to see updates

New and improved Freeview radiation patterns

I'm very pleased to announce that the list of the radiation patterns - the diagrams that show the power levels for each direction from a transmitter - have returned in an improved format. In addition UK Free TV now has 528 new patterns received in the last month from Ofcom under a Freedom of Information Act request.

Radiation patterns   Photograph: pssl.com
Radiation patterns Photograph: pssl.com
published on UK Free TV

What are radiation patterns?

All ground-based broadcast transmitter – be it for a Freeview, DAB, AM/FM radio or mobile phones – can and do broadcast their output at different levels in different directions.

The diagrams here on UK Free TV show all the known patterns.   In theory each transmitter can have a different pattern for each transmission frequency.     

This diagram shows how the Primrose Hill Freeview transmitter's coverage map and the radiation pattern for it.

Radiation pattern example

Why did you say "known patterns"?

Because, and I quote

  • disclosure of the antenna radiation patterns into the public domain could lead to these being available to foreign administrations, which would substantially weaken HM Government's negotiating position with respect to international frequency clearance;
  • a weaker negotiating position for HM Government may lead to additional cost for the broadcasters (where antenna systems have to be re-built as a result of international coordination) and lower coverage for viewers (where antenna systems have to be restricted in order to protect foreign transmissions); and
  • the BBC is required to provide coverage of its services on digital terrestrial television to a certain proportion of the population by the completion of switchover and a failure or suboptimal result from international co-ordination may harm the BBC's ability to meet this obligation.

The number of sites that we have data is limited to the data released by the BBC in 2009 – see Update on transmitter radiation patterns (BBC FOI request) – plus the new data from Ofcom.

 

What is the new data?

With help from Dave Lindsay, I contacted Ofcom to ask them to release the data related to the upcoming UK Digital Terrestrial Television: International Coordination Agreements

I do note that on the above-mentioned Ofcom link there is a link to "International Co-ordination Technical Parameters and Nominal Antenna Templates"  http://www.ofcom.org.uk/static/broadcasting/Web_Int%20Coord%20800MHz%20DTT%20Clr%20Tech%20and%20Nominal%20Templates_22May13.pdf  This would appear, on the surface, to provide some of the missing transmitter data.     Whilst I understand that this is co-ordination information and may represent greater coverage than the actual transmitters use, I would prefer to have some radiation pattern information with a written warning, rather than "none".  

Do the new patterns match the output?

"While you are already aware of this, I would like to emphasise that the powers and antenna templates in these files represent the upper limit of the UK’s internationally agreed rights for specific frequency assignments, and the actual antenna patterns and/or powers used by the broadcasters are often more restricted. Additionally, not all of the assignments which have been co-ordinated are currently in use." - Ofcom

 

New SVG format

UK Free TV was using "HTML5 canvas" to draw the radiation patterns.     However the site now uses the SVG format for the graphics.     This has the several advantages, in particular that it is now easy to embed more than one diagram in a page where necessary. 

 

Some examples of the new data

Where the diagrams show (CCN) this is the new "Co-ordination combined nominal template derived from International co-ordination technical agreements" data.  A pattern with a "F" prefix is for a frequency not currently used at that mast for a live TV service (F570 is 570MHz also known as UHF C33). 

New radition patterns

 

What next?

The site's coverage maps will be regenerated soon to include all this new data. 

 



Help with Television sets?
Why are all TVs on sale not digital?1
Do I still have to pay for a TV licence?2
I had perfect channel 5 reception - until I got a digital TV box!3
I Have a Pocket Tv For taking out so I can keep up with news and sport. Will thi4
The pictures from my digital box are all green!5
[][][
In this section
Why did the BBC just use 1.1 Million TV Licences to buy UKTV from Discovery? 1
ITV and Freeview2
New Freeview Mobile App Launching in January 20193
Freeview 2024?4
Broadcasters collaborate to secure future of free-to-view TV 5
BBC Local Radio on Freeview 6

Comments
Wednesday, 25 November 2020
H
https://wilso479.technota9adom.com/2020/
11:42 PM

It's in point of fact a great and helpful piece of
info. I am happy that you shared this helpful information with us.

Please stay us up to date like this. Thanks for sharing.

link to this comment
https://wilso479.technota9adom.com/2020/'s 1 post US
Thursday, 26 November 2020
H
https://king221.tallerdepaginasweb.com/2
8:39 PM

If some one desires to be updated with newest technologies afterward he must be pay a visit this web site and be up to date all the time.

link to this comment
https://king221.tallerdepaginasweb.com/2's 1 post US
Friday, 27 November 2020
S
scott345.anugrahjayapondasi.com
12:21 AM

Hey would you mind letting me know which hosting company you're using?
I've loaded your blog in 3 different internet browsers and I
must say this blog loads a lot quicker then most. Can you recommend a good internet
hosting provider at a fair price? Many thanks, I appreciate it!

link to this comment
scott345.anugrahjayapondasi.com's 1 post US
H
https://scott740.yztbet.com/p/1
1:15 AM

I like reading an article that will make people think.
Also, many thanks for allowing me to comment!

link to this comment
https://scott740.yztbet.com/p/1's 1 post US
Saturday, 28 November 2020
G
green835.mohtafa.com
5:47 PM

If you desire to improve your familiarity just keep visiting this website and be updated with the most up-to-date news posted here.

link to this comment
green835.mohtafa.com's 1 post US
H
https://king880.lmdepser.com/2020/11/14/
6:16 PM

Unquestionably believe that which you stated.

Your favorite reason seemed to be on the web the easiest
thing to be aware of. I say to you, I definitely get annoyed while people think about worries that they plainly don't know about.
You managed to hit the nail upon the top and defined out the whole thing without having side-effects ,
people could take a signal. Will probably be
back to get more. Thanks

link to this comment
https://king880.lmdepser.com/2020/11/14/'s 1 post US
Sunday, 29 November 2020
H
https://green315.driyaweb.com/2020/11/13
12:41 AM

Hello, after reading this awesome paragraph i am as well glad
to share my experience here with friends.

link to this comment
https://green315.driyaweb.com/2020/11/13's 1 post US
C
carter641.rizalpost.com
3:18 AM

Hi there Dear, are you in fact visiting this web page on a regular basis, if so after that you will definitely obtain nice experience.

link to this comment
carter641.rizalpost.com's 1 post US
W
wrigh402.off9shop.com
4:04 AM

My coder is trying to convince me to move to .net from PHP.

I have always disliked the idea because of
the costs. But he's tryiong none the less. I've been using WordPress
on several websites for about a year and am worried
about switching to another platform. I have heard great things about blogengine.net.
Is there a way I can import all my wordpress posts into it?
Any help would be greatly appreciated!

link to this comment
wrigh402.off9shop.com's 1 post US
T
thompson1043.xinishila.com
1:11 PM

I visit daily some websites and blogs to read articles, except this web
site gives feature based posts.

link to this comment
thompson1043.xinishila.com's 1 post US
Select more comments

Your comment please
Please post a question, answer or commentUK Free TV is here to help people. If you are rude or disrespectful all of your posts will be deleted and you will be banned.







Privacy policy: UK Free Privacy policy.