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 21/10/2024 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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Monday, 11 February 2013
J
jb389:35 PM
martyh: Well I look at this potential problem in various ways, and putting aside my sense of outrage that something has actually been sanctioned that is already known (or suspected) beforehand as having the potential to affect a mode of reception (Freeview) that by its very nature is already vulnerable to being interfered with by a number of things, including of course nature. (inversion effect etc)
That said, I feel that this issue is being somewhat over hyped to a certain extent by a number of well placed non-technical types (in the practical sense) but with the means to be extremely vocal, and this is causing many people to panic quite unnecessarily about this issue, although I do admittedly feel that anyone within a couple of hundred yards or so from one of these masts could well experience problems "if" the Freeview signal they receive is sitting at a lower than ideal level for reception, this automatically making the receivers tuner more vulnerable to interference from any RF sources nearby.
The whole thing is really a wait and see game, because when dealing with RF signals other than microwaves its quite impossible for anyone to accurately predict exactly what will happen as so many variables exist with peoples installations, coupled to the fact that its notoriously difficult to predict exactly what level of interference (if any) that viewers will suffer from if they reside anywhere near to a mast, as RF predictions, whether for reception or expected levels of interference, are up to a point educated guesswork unless on site tests are carried out.
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J
jb3811:13 PM
martyh: On reading over my reply I feel that I should clarify part of a statement made, insomuch when I referred to non-technical types with the means to be extremely vocal, I was mainly meaning media types who consider themselves to be an authority on technical matters.
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Tuesday, 12 February 2013
S
Steve Flynn10:36 PM
Haslemere
Crystal Palace - answering my own question and asking another.
I replaced all internal cabling and fitted a new distribution amp and have restored my missing channels.
However although I now have good signals on BBC-A, D3+4 and BBC-B I don't get any signal at all from SDN, ArqA or ArqB multiplexes from Crystal Palace.
Digital UK tradeview does not show these channels as being available but they are listed here as being broadcast from CP at the same power as the other multiplexes. Why can't I receive them from CP? I can get them from Hannington but they are at a lower level and I am on the outer edge for good reception from there.
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Steve's: mapS's Freeview map terrainS's terrain plot wavesS's frequency data S's Freeview Detailed Coverage
Steve Flynn: I think we covered this one when you made your posting before DSO. Haslemere relay transmitter is co-channel with Crystal Palace's COMs.
Not sure whether a phased array might help:
http://www.wrightsaerials….pdf
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S
Steve Flynn11:08 PM
Haslemere
Dave Lindsay: Thanks, I had forgotten about co-channel interference which in this case is 100% effective in the worst way. Predictions around DSO seemed to change on a daily basis so I wasn't sure what I would eventually get.
I don't think I want yet another aerial on my pole so phased array isn't an option. A local installer suggested switching my CP aerial to vertical but I may look at a better aerial for Hannington instead.
Thanks again, at least I know there is little I can do now.
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Steve's: mapS's Freeview map terrainS's terrain plot wavesS's frequency data S's Freeview Detailed Coverage
Wednesday, 13 February 2013
Steve Flynn: At switchover we had a posting from someone off Grayswood Road who had lost access to Haslemere transmitter and therefore BBC South/ITV Meridian programming because of this. Understandably he wasn't happy because he wanted these regional services rather than the London ones. His location was on the fringes of the Haslemere transmitter and, evidently, its signal is no match at that location for Crystal Palace's.
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S
Steve Flynn1:55 PM
Haslemere
Dave Lindsay: Maybe I should swap houses with the man from Grayswood :)
My Hannington aerial is Group E and I see that the transmitter is now listed as Group B. I think the theoretical difference in gain between otherwise similar B and E group aerials is about 2dB but would this make enough of a difference for those lower powered Mux's?
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Steve's: mapS's Freeview map terrainS's terrain plot wavesS's frequency data S's Freeview Detailed Coverage
Steve Flynn: Interestingly, Hannington's four former analogue channels were not within a single third of the band Group, but semi-wideband Group E so I guess this might be how come your aerial is an E.
I'm not a professional, so can only give you theory. Here are some example gain curves:
Gain (curves), Again
An aerial's gain is simply at the expense of "loss" in other directions. So a higher gain aerial focuses the signal into a narrower beam. The gain of yagi aerials drops off on lower channels hence they are less directional on lower channels than on higher ones.
However, your amplifier will increase the amplitude of the signals. Getting a higher gain aerial doesn't necessarily improve matters as it has a narrower acceptance angle. As you are trying to pick it up at the bottom of a drop, having your aerial receiving on a finer beam isn't necessarily a better thing because the quality may suffer. You can increase the amplitude of a signal with an amplifier, but if you don't have the quality (digits in order) then you might as well pack up. See:
Television Aerial Boosters / Amplifiers, Splitters, Diplexers & Triplexers
What sort of reception of the Hannington COM channels do you get? If it is poor at times, is it strong but poor quality?
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S
Steve Flynn9:47 PM
Haslemere
Dave Lindsay: Reception varies, at present COM5 is pretty good with quality at 8-9 out of 10 but COM 4 & 6 are only at quality 1-2. Strength is around 7-8 on all.
The gain curves on your link seem to show that a B Group aerial would be a better bet but I guess I should check that my current aerial is giving the best it can first.
My amplifier is in circuit to diplex TV and FM as well as distribute to different rooms but I don't think it is causing any problems with too strong a signal - I bypassed it just to check.
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Steve's: mapS's Freeview map terrainS's terrain plot wavesS's frequency data S's Freeview Detailed Coverage
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