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.
This transmitter has no current reported problems
The BBC and Digital UK report there are no faults or engineering work on the Hemel Hempstead (Hertfordshire, England) transmitter._______
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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Tuesday, 3 September 2024
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Chris.SE2:18 PM
Ray G:
As per a number of posts recently where reception from the Hemel Hempstead transmitter had been affected, there have been a number of new/upgraded phone masts which are now operating in the 700MHz band which are the most likely cause of your reception problems. You are surrounded by at least 7 and there are 3 in the direction of the transmitter which could be the likely culprits.
Your postcode should have been sent postcards from Restore TV about this possibility, your existing filter will not block the 700MHz band signals, the new Free filter will block 700 & 800 bands,
you can check here -
https://restoretv.uk/post…ure/
Contact Restore TV 0808-1313-800 and request a Free Filter. This should be inserted before any amp/splitter.
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S
Steve Donaldson4:46 PM
It is curious that there have been other reports of issues with Hemel Hempstead, all impacting C46. I wonder if a mobile network has base stations across the area now using 700MHz frequencies, those previously used by TV and which could potentially cause TV reception issues.
These are from Hemel Hempstead (where the person says others in the area are complaining of the same issue) and Watford. Thus, it's pretty widespread and can't be the same base station, hence why I suggest it may be a group of them across a wider area.
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D
David Piper 7:30 PM
Steve Donaldson:
I had good reception of all channels this morning.
Now I have no signal on channels 37, 40, 43 and 46
Each shows 0% quality of signal between 0 and 38%
Who owns this problem?
Thanks
David
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Chris.SE11:08 PM
David Piper :
Have you been in touch with Restore TV as advised?
THEY own the problem!.
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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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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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Thursday, 19 September 2024
P
Peter Harris9:58 AM
Firstly, many, many thanks to ukfree.tv and its posters for alerting me to this interference issue. I spent ages trying to work out what was wrong with our TV and was on the verge of buying a new one! Then I found these posts. I duly contacted Restore TV and they confirmed that there had been 'changes' at a local mobile phone mast. They sent me a CH48 filter and all is well again. My neighbour was having similar issues so he went through the same process and his loss of channels / pixelation impacting CH43 and CH46 stations has been fixed too. We both have rather elderly TV distribution amps - the modern ones have filters built-in which may explain why other folk had no problems. We live in the WD5 postcode area, so it's not just impacting HP3.
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Chris.SE1:47 PM
Peter Harris:
Thanks for giving us an update Peter, much appreciated.
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Thursday, 3 October 2024
Transmitter engineering
5:09 AM
5:09 AM
Hemel Hempstead transmitter - Hemel Hempstead transmitter: Possible effect on TV reception week commencing 30/09/2024 Pixelation or flickering on some or all channels [DUK]
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