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 - Hemel Hempstead transmitter: Possible effect on TV reception week commencing 23/09/2024 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 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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Monday, 2 September 2024
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Chris.SE12:43 AM
David Piper :
Perhaps you could try reading my previous reply above as well as the Engineering post and my previous post above that. As you haven't given a full postcode, we can't check your predicted reception or whether you may be suffering other interference from new/updated phone masts.
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David Piper 10:26 AM
Hemel Hempstead
Chris.SE: Thanks for the reply.
Issue started in last fortnight, previously been excellent reception for years. No changes at home.
HP39NU
3 TVs have no signal on channel 46, with some errors on channel 43.
2 aerials.
Facebook tells me others in HP3 have same issue with loss of HD channels.
Thanks
David
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David's: mapD's Freeview map terrainD's terrain plot wavesD's frequency data D's Freeview Detailed Coverage
S
Steve Donaldson12:43 PM
David Piper : A possible cause is a nearby mobile phone mast which has started using the 700MHz or 800MHz bands, frequencies previously used for TV, and therefore which TVs are capable of receiving (though no longer used). This can sometimes cause issues with TV reception, and Restore TV is the organisation responsible for alleviating such issues. This is usually by means of a filter, which they supply free of charge, which blocks those frequencies, preventing them from reaching the TV.
It may be worth asking them to send you a filter and see if it fixes the issue:
https://restoretv.uk/post…ure/
The filter must go before any signal amplifier/booster. As you have two aerials for which the same issue is occurring, you will need two filters.
As you have three TVs, then one of the aerials must be feeding two TVs. Fit the filter before the splitter (irrespective of whether it is powered amplifier or non-powered, passive splitter).
Then report back your findings here. If a filter alleviates the issue, share this information with others in the area.
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David Piper 9:15 PM
Steve Donaldson:
Thank you for the reply.
I have contacted restoretv and requested 2 filters.
Do you know where this mast is?
Thanks David
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Chris.SE9:40 PM
David Piper :
As you've probably discovered following the link that Steve posted, Restore TV should have sent postcards to your postcode.
You are surrounded by Mobile Phone masts - at least 15 of them within 1.5km. It could be any one (or more) of them recently upgraded. I'm afraid neither the Mobile operators, Freeview or Restore TV tell anyone about which masts it might be!
If you post on that Facebook group, you could post the Restore TV link/details so others can check their postcode or if they've had a postcard.
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Tuesday, 3 September 2024
R
Ray G11:59 AM
Hatfield
Freeview HD channels disappeared completely yesterday (2nd Sept) and very unstable today. This is on several Tv's and STB's in the house. All normal measures have been tried. I even have a ceramic filter still installed, left over from when I had one programme group on channel 59 (when it solved the then problem beautifully).
I am in Hatfield Hertfordshire, AL9 5HF and receive programmes from the Hemel Hempstead transmitter. Reception has been very good and stable for several years now until yesterday. Atmospherics are probably the culprit, but why now? We've all sorts of weather conditions over the last 3-4 years (at least), without any real problems. Has something else changed?
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Ray's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
C
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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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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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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