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C21 (474.0MHz) after switchover

The map below shows all the transmitters in the UK using C21 once digtial switchover is complete. Please click the icon to see the coverage area, and double click for more information.

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What do the map symbols mean?

 COM4/SDN multiplex,  COM4/SDN multiplex,  COM5/ArqivaA multiplex,  COM6/ArqivaB multiplex,  PSB1/BBCA multiplex,  PSB1/BBCA multiplex,  PSB2/Digital 3+4 multiplex,  PSB2/Digital 3+4 multiplex,  PSB3/BBCB/Freeview HD multiplex,  PSB3/BBCB/Freeview HD multiplex,  Saorview multiplex 1,  Saorview multiplex 1.

Before switchover

Click on a selection to see the use of the frequency use before switchover:

C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68

Switchover complete

Click on a selection to see the use of the frequency use when switchover is complete:

C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 * * * * * *

Thursday, 19 April 2012
Mike Dimmick

12:38 PM

Ed Stockings: Despite the current UK spec saying that the best transmitter should be tuned in, some HD boxes still do it the stupid way, selecting the first version found when scanning. Complain to the manufacturer (my guess is it's a Humax?)

You may also find that you're getting D3&4 (i.e. ITV1, C4, C5 and associated channels) from Sandy Heath rather than Crystal Palace, as this transmits on C24 from SH compared to C26 at CP.

A manual retune is the only way to ensure you're getting the services you do want. If it's still flaky after doing that, check for too much signal.

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Mike Dimmick's 2,486 posts GB
Friday, 20 April 2012
9:49 PM

I live very close to Crystal Palace. Until 18 April I used to receive a very good signal quality with all channels. Since the switch over, I have lost most of them, ie ITV3, etc.
I still have strong signal with other channels as BBC. I have tried to retune the box several times but it is not working. Any suggestions of what I can do? Thank you.

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Esther's 1 post GB
Monday, 23 April 2012
roy in southend
5:29 PM

We've have just completed switchover here in Southend on Sea, Essex. Everything is fine, great pictures, strong signal, except for one oddity. I pick up ITV Anglia news, as I expect, but my neighbour in the SAME block, using the SAME communal aerial picks up ITV London news, which he doesn't want. We've spent time retuning, but can only repeat this odd situation. Can anyone explain how we pick up different transmitters for the same channel, same aerial?

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roy in southend's 2 posts GB
Dave Lindsay

6:13 PM

roy in southend: London switchover completed last Wednesday and Anglia switchover completed last July.

So either:

1. you are tuned to an Anglia transmitter (probably Sudbury) even though the aerial faces London (Crystal Palace), or;

2. you have been incredibly slow at retuning, or;

3. your block of flats have two aerials (one on Sudbury and one on Crystal Palace) which are combined and fed throughout the building's distribution system. This would give you the choice of reliable reception of either region.

Some receivers, when they encounter signals from different regional transmitters, present the user with a menu with those regions. It is often the case that there is only a single aerial which is directed at one transmitter. Therefore selection of any region other than the one of that transmitter may be liable to poor reception because the aerial was not intended to pick it up. The same thing happened in the days of analogue and would usually result in a poor picture.

As for Crystal Palace vs Sudbury, the former uses low channel numbers and the latter's are higher. During the automatic tuning scan, Crystal Palace is picked up below 30% and Sudbury is above. So unplug the aerial lead during part of the scan, to avoid the respective transmitter's signals.

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Dave Lindsay's 5,724 posts GB
Friday, 4 May 2012
Dave in Southampton
2:55 PM

Hi there,

If someone could help me, I'd be extremely grateful.

My postcode is SO302AG and I live in Southampton, Hampshire. I have an LG 32LD490 TV, which has in-built Freeview HD.

Following the digital switchover on March, I understood that I should have been able to receive HD channels, however I am so far unable to. Whenever I retune the TV, it fails to find the HD channels (51, 52 etc...). I have reset the TV to factory settings and tried again. I have removed the booster from my aerial. I have bought an attenuator for the signal, in case it is too strong. I have tried the TV plugged into my separate loft aerial, which does not have a particularly strong signal. In all cases, no HD channels.

Strangely, I did once manage to receive them using an set-top aerial, however the reception was very poor and other Freeview channels were not found at all.

Can anyone give me any advice? I bought the TV specifically for the Freeview HD channels, so it is frustrating not to be able to receive them.

Can anyone assist me with this?



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Dave in Southampton's 1 post GB
Mark Fletcher

6:03 PM

Dave in Southampton.
Is your main aerial polarised horizontally or vertically loft or externally mounted,and is it also a group A aerial (tipped red) or a group W wideband aerial (tipped black).
One possibility could be that the aerial co-ax cable needs replacing if it is rather old as HD broadcasts do give somewhat poor performance on old co-ax aerial cable.

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Mark Fletcher's 673 posts GB
Mark Fletcher

6:04 PM

Once again i apologise for my incorrect location as such on my above text.

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Mark Fletcher's 673 posts GB
Thursday, 17 May 2012
Fair Oak J
5:33 PM

I've always had good reception from Rowridge for the Yesterday channel, film4 etc. until the latest retuning!
Now get blochy/bad signals, one set top box will not even try to tune in this set of channels.
I notice that the signal is very weak compared to others WHY? I understood that with all this retuning the signal strength would INCREASE, hence BETTER reception, why is this not the case?

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Fair Oak J's 1 post GB
Sunday, 20 May 2012
Ray Pearson
10:40 AM

I live in Chorley lancsand have just bought two new TVs, a sony Bravia and a sharp Aquos. I cannot pick up BBC 1 and 2 after auto installation. Can anyone help?

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Ray Pearson's 1 post GB
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