Full Freeview on the Sudbury (Suffolk, England) transmitter
 | Google Streetview |  | Google map |  | Bing map |  | Google Earth |  | 52.005,0.786 or 52°0'17"N 0°47'8"E |  | CO10 5NG |
The symbol shows the location of the Sudbury (Suffolk, England) transmitter which serves 440,000 homes. The bright green areas shown where the signal from this transmitter is strong, dark green areas are poorer signals. Those parts shown in yellow may have interference on the same frequency from other masts.
Are there any planned engineering works or unexpected transmitter faults on the Sudbury (Suffolk, England) mast?
Sudbury transmitter - Sudbury transmitter: Possible effect on TV reception week commencing 18/11/2024 Pixelation or flickering on some or all channels 
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Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.
64QAM 8K 3/4 27.1Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)
The Sudbury (Suffolk, England) mast is a public service broadcasting (PSB) transmitter, it does not provide these commercial (COM) channels: .
If you want to watch these channels, your aerial must point to one of the 80 Full service Freeview transmitters. For more information see the will there ever be more services on the Freeview Light transmitters? page.
Which Freeview channels does the Sudbury transmitter broadcast?
If you have any kind of Freeview fault, follow this Freeview reset procedure first.Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.
64QAM 8K 3/4 27.1Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)
The Sudbury (Suffolk, England) mast is a public service broadcasting (PSB) transmitter, it does not provide these commercial (COM) channels: .
If you want to watch these channels, your aerial must point to one of the 80 Full service Freeview transmitters. For more information see the will there ever be more services on the Freeview Light transmitters? page.
Which BBC and ITV regional news can I watch from the Sudbury transmitter?
BBC Look East (East) 0.8m homes 3.2%
from Norwich NR2 1BH, 77km north-northeast (24°)
to BBC East region - 27 masts.
70% of BBC East (East) and BBC East (West) is shared output
ITV Anglia News 0.8m homes 3.2%
from NORWICH NR1 3JG, 78km north-northeast (24°)
to ITV Anglia (East) region - 26 masts.
All of lunch, weekend and 80% evening news is shared with Anglia (West)
Are there any self-help relays?
| Felixstowe West | Transposer | 1000 homes +1000 or more homes due to expansion of affected area? | |
| Witham | Transposer | 14 km NE Chelmsford. | 118 homes |
How will the Sudbury (Suffolk, England) transmission frequencies change over time?
| 1984-97 | 1997-98 | 1998-2011 | 2011-13 | 1 Aug 2018 | |||||
| B E T | B E T | B E T | E T | K T | |||||
| C29 | SDN | ||||||||
| C31 | ArqA | ||||||||
| C35 | C5waves | C5waves | |||||||
| C37 | ArqB | ||||||||
| C41 | ITVwaves | ITVwaves | ITVwaves | D3+4 | D3+4 | ||||
| C44 | BBC2waves | BBC2waves | BBC2waves | BBCA | BBCA | ||||
| C47 | C4waves | C4waves | C4waves | BBCB | BBCB | ||||
| C51tv_off | BBC1waves | BBC1waves | BBC1waves | ||||||
| C56tv_off | ArqB | ||||||||
| C58tv_off | SDN | ||||||||
| C60tv_off | -ArqA |
tv_off Being removed from Freeview (for 5G use) after November 2020 / June 2022 - more
Table shows multiplexes names see this article;
green background for transmission frequencies
Notes: + and - denote 166kHz offset; aerial group are shown as A B C/D E K W T
waves denotes analogue; digital switchover was 6 Jul 11 and 20 Jul 11.
How do the old analogue and currrent digital signal levels compare?
| Analogue 1-4 | 250kW | |
| SDN, ARQA, ARQB, BBCA, D3+4, BBCB | (-4dB) 100kW | |
| Analogue 5 | (-7dB) 50kW | |
| Mux 2* | (-14.9dB) 8.1kW | |
| Mux B* | (-15.2dB) 7.5kW | |
| Mux 1* | (-15.5dB) 7kW | |
| Mux A* | (-17dB) 5kW | |
| Mux C* | (-22.2dB) 1.5kW | |
| Mux D* | (-23.6dB) 1.1kW |
Which companies have run the Channel 3 services in the Sudbury transmitter area
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Saturday, 14 May 2011
Nick: You can get quite good, an quite expensive, powered speakers such as
GigaWorks T3 2.1 Audiophile Speakers | Creative Store (UK)
- a snip at £150.
As for the source of the interference - take your pick - UK TV Frequency map - channel C51 (714.0MHz) before switchover map | ukfree.tv - independent free digital TV advice .
I thought I said that Bluebell Hill was a potential future source of digital interference?
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Monday, 16 May 2011
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Nick11:12 AM
Woodbridge
Thanks Brian. So we can definitely rule out continental xmitters as a source of interference to channel 51 as all are digital?
The interference to channel 51 has been permanent for many weeks, though not serious. I wondered if it was a problem with my set, but we all get it round here.. Quite a mystery, will look to see what uk xmitters might be causing it.
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Nick's: mapN's Freeview map terrainN's terrain plot wavesN's frequency data N's Freeview Detailed Coverage
Nick: Given that the signals would have to come all the way from Norway or Cean in France, I would have thought so.
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Tuesday, 17 May 2011
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Nick11:06 PM
Woodbridge
Many thanks. A friend who used to work in the industry tells me he understands the herringbone to be caused by the digital channels from Sudbury itself, even though not on the same channel 51. What do you think of that one? I think it fair to say the herringbone is there all the time and therefore possibly not caused by atmospheric conditions.
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Nick's: mapN's Freeview map terrainN's terrain plot wavesN's frequency data N's Freeview Detailed Coverage
Wednesday, 18 May 2011
Nick: No, the digital channels look like low power white noise to the analogue domain and can never cause "herringbone" type interference. This is because COFDM (like most digital transmission systems) uses interpolation, as this is necessary to ensure the signals do not generate sidebands, as analogue signals do.
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Here's a diagram from Crystal Palace showing the analogue and digital signals:
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C
Chris Jenkins9:32 AM
Bracknell
Dear Brian,
Our postcode is RG42 4UW.
We have a class 2 wideband aerial mounted on our chimney. Unti recently it was pointed at Hannington and we had good Freeview reception. We were very keen to try FreeView HD so we recently got an aerial company to re-orient it to point at Crystal Palace. We get still get good Freeview reception but Freeview HD reception is flaky. Sometimes it is fine but other times it is non-existent or drops out a lot. Our PVR and TV show good strength but poor (and variable) 'quality' for the HD signal (regular signal is high strength and high quality). We already have an amplifier/splitter connected and are wondering if a better aerial (class 1) might help? I suspect that when Freeview HD switches to full power transmission we might also be okay but that is some time away. Any advice before we invest in a better aerial? Many thanks.
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Chris's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
Chris Jenkins: I would say that, yes, your Freeview HD reception will be flaky from Crystal Palace, and will continue to be so until Wednesday 18th April 2012.
You might want to try removing the amplifier, they are often the cause of problems for digital reception.
To be honest, for the money you would have to spend on a new aerial, it might be better to use Freesat HD for HD reception as you can get a dish, installation and receiver for less than you would spend on a new aerial that may not actually improve things.
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Nick11:49 AM
Woodbridge
Thanks Brian. This permanent herringbone on ch 51 remains a mystery then.
You have opened another can of worms with your reply to Chris Jenkins saying amps can cause interference on digital. At my friend's house in Aldeburgh they use an amp for Sudbury and hope to continue to use it and Sudbury, rather than Aldeburgh with its few channels after switchover. Can you briefly outline any symptoms to look for if we get problems, so we can work out if they may be due to the amp? Many thanks.
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Nick's: mapN's Freeview map terrainN's terrain plot wavesN's frequency data N's Freeview Detailed Coverage
Friday, 20 May 2011
Nick: Your herringbone problem may be caused by a reflected signal that just happens to be awful on C51 on a permanent basis.
The problem with amplification is that it does nothing to increase the quality of the digital multiplex reception.
This is because the amplifier will boost the interference in the signal as much, if not more, than the COFDM signal. This is because amplification does not change the signal-to-noise ratio.
You usually see this problem when you have 90%-100% signal strength showing on a set-top box, but the signal quality goes from 100% to 0% and you get sound dropouts and picture freezes.
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