Full Freeview on the Crystal Palace (Greater London, England) transmitter
 | Google Streetview |  | Google map |  | Bing map |  | Google Earth |  | 51.424,-0.076 or 51°25'26"N 0°4'32"W |  | SE19 1UE |
The symbol shows the location of the Crystal Palace (Greater London, England) transmitter which serves 4,490,000 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 Crystal Palace (Greater London, England) mast?
Crystal Palace transmitter - Crystal Palace transmitter: Possible effect on TV reception week commencing 11/11/2024 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
DTG-12 QSPK 8K 3/4 8.0Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)
Which Freeview channels does the Crystal Palace 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
DTG-12 QSPK 8K 3/4 8.0Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)
Which BBC and ITV regional news can I watch from the Crystal Palace transmitter?
BBC London 4.9m homes 18.4%
from London W1A 1AA, 12km north-northwest (335°)
to BBC London region - 55 masts.
ITV London News 4.9m homes 18.4%
from London WC1X 8XZ, 11km north-northwest (345°)
to ITV London region - 55 masts.
Are there any self-help relays?
| Charlton Athletic | Transposer | Redeveloped north stand Charlton Athletic Football Club | 130 homes |
| Deptford | Transposer | south-east London | 100 homes |
| Greenford | Transposer | 12 km N Heathrow Airport | 203 homes |
| Hendon | Transposer | Graham Park estate | 50 homes |
| White City | Transposer | 9 km W central London | 80 homes |
How will the Crystal Palace (Greater London, England) transmission frequencies change over time?
| 1950s-80s | 1984-97 | 1997-98 | 1998-2012 | 2012-13 | 21 Mar 2018 | ||||
| VHF | A K T | A K T | A K T | A K T | W T | ||||
| C1 | BBCtvwaves | ||||||||
| C22 | ArqA | ArqA | |||||||
| C23 | ITVwaves | ITVwaves | ITVwaves | BBCA | BBCA | ||||
| C25 | SDN | SDN | |||||||
| C26 | BBC1waves | BBC1waves | BBC1waves | D3+4 | D3+4 | ||||
| C28 | -ArqB | ArqB | |||||||
| C29 | LW | ||||||||
| C30 | C4waves | C4waves | C4waves | -BBCB | BBCB | ||||
| C33 | BBC2waves | BBC2waves | BBC2waves | com7 | |||||
| C35 | com8 | ||||||||
| C55tv_off | com7tv_off | ||||||||
| C56tv_off | COM8tv_off |
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 4 Apr 12 and 18 Apr 12.
How do the old analogue and currrent digital signal levels compare?
| Analogue 1-4 | 1000kW | |
| SDN, ARQA, ARQB, BBCA, D3+4, BBCB | (-7dB) 200kW | |
| com7 | (-13.7dB) 43.1kW | |
| com8 | (-14dB) 39.8kW | |
| Mux 1*, Mux 2*, Mux A*, Mux B*, Mux C*, Mux D*, LW | (-17dB) 20kW |
Local transmitter maps
Crystal Palace Freeview Crystal Palace DAB Crystal Palace AM/FM Crystal Palace TV region BBC London LondonWhich companies have run the Channel 3 services in the Crystal Palace transmitter area
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Saturday, 5 May 2012
J
jb385:53 PM
Big Mart: Yes, as HD is more critical than SD to signals that are less than perfect, this being why that its usually always found that just after any station has switched over to high powered operation that a number of people complain that rather than their situation having improved, that they have now either completely lost their HD reception or that their picture has started to suffer from periods of freezing / pixelation etc, and as just like in your own case SD being reported as OK.
It should be pointed out, that whether it be HD or SD these type of symptoms are the forerunner to the picture disappearing altogether, this being caused by the tuner being swamped by excessive RF levels, this causing its input voltage tolerance range to be exceeded.
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B
Big Mart6:07 PM
London
jd38: Are you saying that my SD channels on the digital recorder are likely to disappear or just the HD ones?
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Big's: mapB's Freeview map terrainB's terrain plot wavesB's frequency data B's Freeview Detailed Coverage
jb38: Is an excessive level of signal likely to cause damage to the tuner? Or does it only happen in extreme cases?
Where it does happen, does this happen instantly or is it a matter of time? Or in general it is both, depending on how extreme it is?
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J
jb388:26 PM
Dave Lindsay: No, and not in an extreme case either, as even with an excessively high level of signal that can obliterate reception by swamping the tuners input / oscillator mixer circuitry with will still only represent a fraction of the voltage that would be necessary to damage the tuners input / mixer transistors (i.e: micro/milli volts v/s volts) and a tuners input is usually protected against these type of excesses anyway, and with the only reason it creates havoc in a tuner is that the tuner becomes unstable and corrupts / destroys the data being carried in the signal thereby leaving virtually nothing to decode just like a dead carrier, the reason why no quality is seen indicated when a strength / quality check is made.
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J
jb388:42 PM
Big Mart: No, and especially so in your case, as whatever is causing your problem has to be at a level that's just causing the difficulty and no more, and if you have a negative result from your short piece of wire test then its inclined to indicate that the problem could be being caused before it reaches you, and possibly in the communal aerials distribution amplifier system.
This being said though, its a pity that you cant verify your HDT500's performance at another location, as when dealing with problems such as yours actual tests being made on-site using different pieces of equipment can rapidly determine where a fault is located.
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Sunday, 6 May 2012
H
hunny12:51 AM
London
Freeview scrambled after switchover
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Hi,
If anybody could help me. I've been having problems with my Freeview since couple of days before the switchover. I have HUMAX F2-FOX T Box that had been working for 5 years then it just gives me scrambled pictures after the switchover. I live in E14 area which is getting signal from Crystal Palace. I have tried every possibilities, including new internal amplified aerial (Im using outdoor aerial), antenna attenuator (thought the signal was too strong), new freeview box (thought my old one was outdated and need a new one since switchover), new coaxial cables, moved the aerial around, manually and automatically retuned my freeview box for several times now, unfortunately none of those attemps was making any changes to it. my tv still scrambled, then at the end shows no pictures at all (shows 'no or bad signals' and 'this picture is scrambled or not available'). I open up the signal detection on the box it shows around 60-80% strength, but the quality is 0-10% only. this really bugs me because it just happened like that, I never touched anything on the box/tv/aerial before the switchover and was working perfectly until now. Havent been able to watch tv for 1 month now and its really frustrating as I have tried everything but no good outcome.
any suggestions?
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hunny's: mapH's Freeview map terrainH's terrain plot wavesH's frequency data H's Freeview Detailed Coverage
M
Mark Fletcher1:02 AM
Halifax
Hunny,London.You must be suffering with too much signal,try a set-top aerial or a piece of wire or even a coathanger and se if that makes any difference.Also did you actually try a Freeview reset procedure prior to your several retunes beforehand that you stated ?
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Mark's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
T
Tony9:02 AM
I use Windows Media Center to access freeview digital services (Crystal Palace) and, since switchover, I'm finding that all of the channels, apart from the HD channels are giving signal qualities of 100% - the HD channels are giving SQs of 60%. Is there any explanation for this variance?
Also, since switchover, I am noticing certain channels, for example BBC News (80), will lose its signal periodically. WMC disables any channels that lose signal quality to zero automatically. So, ,I have to manually re-enable that channel quite often - a real pain.
When I re-enable lost channels and tune in to the channels manually, the signal quality returns to 100%. Go figure. This may be an issue with WMC, but I also think this has something to do with the digital signal after switchover, because this behaviour didn't happen before then.
Has anyone else noticed this or can anyone explain why this might be happening?
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J
jb3810:44 AM
Tony: As you haven't actually given your location (pref post code or one from nearby) the signal levels expected in your locality cannot be checked on, but in general terms if when after switch over any person then finds the SD channels to be OK but not when on HD, this is nearly always caused by the signal received being excessively high and which will always affect HD before SD, so if you reduce your signal level on SD to about 90% or so that should correct the HD problem, should it be caused by what's been mentioned.
If you can access one then for a test try a set top aerial, or even a short piece of wire (about 12") pushed into the inner part of the aerial socket, as if you can still receive a signal by doing that then you are in a high signal level area, and so for a permanent cure you will have to fit a variable attenuator (0-20dB) in line with the aerial socket.
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J
jb3810:54 AM
Tony: I also intended to say, that when excessively high signal levels are in existence then the indications displayed on a receiver cannot be trusted as being accurate and frequently indicate low, or in some cases zero quality, this is because of the circuitry that samples / measures the level being corrupted by being overloaded.
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