menuMENU    UK Free TV logo Archive (2002-)

 

 

Click to see updates

Aerial group performance

How different aerial groups work

How different aerial groups work
published on UK Free TV

Whilst developing the new reception prediction system, I went looking for the reference material relating to the UK Aerial Groups system.

On page 39 of a document entitled "CH61 & 62 Re-Farming Study by Arqiva Final Report 27 October 2008" I found the answers.

To assess the loss of coverage as a result of moving outside of the receive aerial group, account needs to be taken of the performance of receive aerials.

For planning purposes the UKPM assumes that the gain of a receive aerial system is 7dB. This is a somewhat idealised figure based on a good aerial and feeder and no pre-amplifier. The performance of actual receive installations is known to vary considerably from this ideal. Two studies, one for the Virgin consortium that bid for the Channel 5 licence in 1995 and the other for the ITC in 2004 investigated the actual received level for a large sample of domestic installations. This study considered aerial group but not the performance of actual receive installations.

In addition to variability in receive aerial system gain, most aerials are banded and their performance falls away outside their design operating band. The ITC as part of the documentation for the original DTT plan, Notes for applicants on coverage of Digital Television, October 1996, listed the out of group response of representative receive aerials.


I have reproduced the information from the table as a graph. The values are the attenuation (in dB):



It is interesting to note that in group A, C37 is -2dB and "in group", group B, C35 is -3dB and C36 is -2dB and "in group", group C/D has C48 on -1dB and "in group" and group E has C37 or -2dB and C38 and C39 on -1dB and be "in group".



Help with TV/radio stations?
Will car radios have to be replaced?1
Will UKTV History and FTN eventually be available on fSfS or Freesat? They are 2
Could u please explain why there are no subtitles on most of your films terresti3
Can I pay as you go for British Europsort on my digital tv without subscribing?4
I was wondering whether there is any way to view a programme I missed?5
[][][
In this section
PARAS site Archive1
Around the Bend?2
What will we all soon be using the spaces in Freeview for?3
Evolution of safe working at height from ladders processes and training4
Stacker/ De-Stacker5
Clairmont Cairn photos6

Comments
Wednesday, 17 September 2014
C
Christopher Reid
6:56 PM

Many thanks for the prompt reply.
Cheers

link to this comment
Christopher Reid's 2 posts IE
Monday, 3 November 2014
P
phil shaw
3:37 PM

I have a techwood freeview hd set top box. It receives all sd and hd channels expected with the exception of bbc4 hd and others on the com7 multiplex, my question is, does it need a wideband aerial or a software upgrade to get the missing channels. I have tried every tune and re-tune i know be to no avail. Techwood have gone awol. many thanks

link to this comment
phil shaw's 1 post GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

3:38 PM

phil shaw: Without knowledge of your location (preferably in the form of postcode) it is an open-ended question!

In some cases, yes. In others one may have the issue of COM7's lower power not being good enough and therefore consideration as to whether a different aerial and/or amplifier might bring it in.

link to this comment
Dave Lindsay's 5,724 posts GB
H
Helen Vipond
3:54 PM

Dave Lindsay: Hello Dave
location is W3 area in London

link to this comment
Helen Vipond's 2 posts GB
Sunday, 15 March 2015
B
Bob Story
4:02 PM

Hi, I am trying to find if my Aerial should be set Horizontaly or Verticaly in the EX349SH region of Devon. Thanks Bob

link to this comment
Bob Story's 1 post US
Dave Lindsay
sentiment_very_satisfiedPlatinum

4:27 PM

Bob Story: Vertically. The transmitter can be seen on StreetView to the east on the hill.

link to this comment
Dave Lindsay's 5,724 posts GB
Tuesday, 9 February 2016
D
DAS
11:22 PM

phil shaw: Your set top box needs a software upgrade. See Freeview - Loss of BBC HD channels - BBC - FAQs - Home for further information , and go to Vestel issue. - Technical - Digital Spy Forums for information on how to obtain and install the required software upgrade. The usb route is the easiest way to do it.

link to this comment
DAS's 1 post GB
Wednesday, 11 May 2016
L
Lou
5:07 PM

Hi.
I'm moving to wroxall Isle of Wight. Which colour antenna is best for this area? Postcode PO121RU.
Or should I just get a black coded one.
Thanks for you're time

link to this comment
Lou's 1 post GB
J
jb38
sentiment_very_satisfiedPlatinum

7:06 PM

Lou: The post code supplied refers to a location 13 miles from Rowridge, the terrain indicator showing a clear line of site to same, therefore a log periodic aerial should be more than adequate for your requirements.

A log periodic ideal for use in your (new) location can be seen by opening the undermentioned then scrolling down to LOG36, another being the shorter DM18.

Online FM DAB TV Aerial sales

link to this comment
jb38's 7,179 posts GB
Sunday, 7 August 2016
M
Moss
8:23 PM

Hi. Doi use a wide band aerial on the Belmont transmitter Lincolnshire?
Thanks.

link to this comment
Moss's 1 post GB
Select more comments
Page 2

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.