Full Freeview on the Hemel Hempstead (Hertfordshire, England) transmitter
 | Google map |  | Bing map |  | Google Earth |  | 51.729,-0.426 or 51°43'43"N 0°25'34"W |  | HP3 8SA |
The symbol shows the location of the Hemel Hempstead (Hertfordshire, England) transmitter which serves 74,000 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 Hemel Hempstead (Hertfordshire, England) mast?
HEMEL HEMPSTEAD transmitter - DAB: Slightly reduced power due to essential engineering from 13 Sep 10:54 until 13 Sep 12:49. . 
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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 Hemel Hempstead (Hertfordshire, 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 Hemel Hempstead 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 Hemel Hempstead (Hertfordshire, 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 Hemel Hempstead transmitter?
BBC London 4.9m homes 18.4%
from London W1A 1AA, 30km southeast (138°)
to BBC London region - 55 masts.
ITV London News 4.9m homes 18.4%
from London WC1X 8XZ, 31km southeast (135°)
to ITV London region - 55 masts.
How will the Hemel Hempstead (Hertfordshire, England) transmission frequencies change over time?
| 1984-97 | 1997-98 | 1998-2012 | 2012-13 | 18 Apr 2018 | |||||
| B E T | B E T | B E T | E T | K T | |||||
| C29 | ArqB | ||||||||
| C31 | ArqA | ||||||||
| C34 | _local | ||||||||
| C37 | SDN | ||||||||
| C40 | BBCA | ||||||||
| C41 | ITVwaves | ITVwaves | ITVwaves | D3+4 | |||||
| C42 | _local | ||||||||
| C43 | D3+4 | ||||||||
| C44 | BBC2waves | BBC2waves | BBC2waves | BBCA | |||||
| C46 | BBCB | ||||||||
| C47 | C4waves | C4waves | C4waves | BBCB | |||||
| C50tv_off | SDN | ||||||||
| C51tv_off | BBC1waves | BBC1waves | BBC1waves | ||||||
| C55tv_off | ArqB | ||||||||
| C59tv_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 4 Apr 12 and 18 Apr 12.
How do the old analogue and currrent digital signal levels compare?
| Analogue 1-4 | 10kW | |
| SDN, ARQA, ARQB, BBCA, D3+4, BBCB | (-7dB) 2kW | |
| Mux 1*, Mux 2*, Mux A*, Mux B* | (-14dB) 400W | |
| Mux C*, Mux D* | (-17dB) 200W |
Local transmitter maps
Hemel Hempstead Freeview Hemel Hempstead DAB Crystal Palace TV region BBC London LondonWhich companies have run the Channel 3 services in the Crystal Palace transmitter area
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Wednesday, 4 September 2024
C
Chris.SE12:00 AM
Steve Donaldson:
It doesn't seem curious to me. There are multiple MNOs in the area all with multiple cells.
It makes perfect sense for a particular one of them to be upgrading in a given area and several sites being affected. I would think that in the early stages (if as I recall seeing elsewhere) there will be initial testing whilst they check coverage and test equipment and so signals may come and go especially if initial testing is done at low power.
Whilst we've often thought that the highest channels nearest the 700MHz band are the ones to be most likely affected (eg.C46 here currently), we have seen a number of instances where lower channels have been affected but apparently not the higher ones. This could be due to many factors, eg. local landscapes affecting propagation of different frequencies, signal reflections, possible intermod products, particular installations being more susceptible due to cable lengths, where the connections/joints may be and so on. As you know RF can be very much a black art at times and situations can be very complex. Trying to analyse any given one is likely to be an extremely complex matter and unless you have a lot of spare time and are somewhat of a very knowledgeable geek when it comes to RF, it's probably rather pointless. Just fit the filter and it should solve the problem as we've seen many times. If not, then Restore TV should send an engineer which we've also seen and some people have had a new aerial etc. fitted.
IIRC EE and Three are the two operators with purchased allocations in the 700MHz band. In David Piper's case, he's just on the periphery of indoor coverage of 5G from a Three cell to the north of him and just within indoor coverage of 5G EE most likely from a cell to the south of him. There's no EE 3G coverage, so they have switched that off. Three do not appear to have yet done so there, so maybe they are still testing 5G. Some of these MNOs are also doing what they are calling 4G+. Note - just because it's 700MHz it doesn't have to be 5G, it could be 4G and/or 4G+ if I recall the OFCOM agreements correctly.
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C
Chris.SE12:34 AM
Steve Donaldson:
Update/more info to add to my previous post.
O2 did also acquire some of the 700MHz band and they had the lowest frequencies of the allocations in the 700MHz band.
I had previously observed that O2 hadn't been as quick in a number of areas in their 5G upgraded. They are only predicting Outdoor 5G coverage in the Hemel Hempstead area at this time.
Also note that with all operators, it's the UL signals that are lowest frequencies in the specific allocations.
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Thursday, 12 September 2024
S
Steve Donaldson11:37 AM
Chris.SE: Thanks for the explanations you posted here.
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Friday, 13 September 2024
Transmitter engineering
11:08 AM
11:08 AM
HEMEL HEMPSTEAD transmitter - DAB: Slightly reduced power due to essential engineering from 13 Sep 10:54. . [BBC]
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Transmitter engineering
2:09 PM
2:09 PM
HEMEL HEMPSTEAD transmitter - DAB: Slightly reduced power due to essential engineering from 13 Sep 10:54 until 13 Sep 12:49. . [BBC]
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