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Full Freeview on the Hemel Hempstead (Hertfordshire, England) transmitter

first published this on - UK Free TV
sa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps51.729,-0.426 or 51°43'43"N 0°25'34"Wsa_postcodeHP3 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 27/11/2023 Pixelation or flickering on some or all channels Digital tick

Choose from three options: ■ List by multiplex ■ List by channel number ■ List by channel name

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.

 V max
C40 (626.0MHz)214mDTG-2,000W
Channel icons
1 BBC One (SD) London, 2 BBC Two England, 9 BBC Four, 23 BBC Three, 201 CBBC, 202 CBeebies, 231 BBC News, 232 BBC Parliament, plus 16 others

 V max
C43 (650.0MHz)214mDTG-2,000W
Channel icons
3 ITV 1 (SD) (London), 4 Channel 4 (SD) London ads, 5 Channel 5, 6 ITV 2, 10 ITV3, 13 E4, 14 Film4, 15 Channel 4 +1 London ads, 18 More4, 26 ITV4, 28 ITVBe, 30 E4 +1, 35 ITV1 +1 (London),

 V max
C46 (674.0MHz)214mDTG-2,000W
Channel icons
46 5SELECT, 101 BBC One HD London, 102 BBC Two HD England, 103 ITV 1 HD (ITV London), 104 Channel 4 HD London ads, 105 Channel 5 HD, 106 BBC Four HD, 107 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others

 V max
C37 (602.0MHz)214mDTG-82,000W
Channel icons
20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 38 Channel 5 +1, 41 Legend, 42 GREAT! action, 57 Dave ja vu, 58 ITVBe +1, 59 ITV3 +1, 64 Blaze, 67 TRUE CRIME, 68 TRUE CRIME XTRA, 78 TCC, 81 Blaze +1, 89 ITV4 +1, 91 WildEarth, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, 267 Al Jazeera English, plus 35 others

 V max
C31 (554.0MHz)230mDTG-82,000W
Channel icons
 Smithsonian Channel, 11 Sky Mix, 17 Really, 19 Dave, 31 E4 Extra, 36 Sky Arts, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 60 Drama +1, 65 That's Christmas, 70 Quest +1, 74 Yesterday +1, 75 That's 90s, 233 Sky News, plus 11 others

 V max
C29 (538.0MHz)230mDTG-82,000W
Channel icons
 Quest Red +1,  Classic Hits, 12 Quest, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 52 GREAT! christmas, 56 That's TV (UK), 61 GREAT! movies extra, 63 GREAT! christmas mix, 71 That’s 60s, 73 HobbyMaker, 82 Talking Pictures TV, 83 Together TV, 84 PBS America, 235 Al Jazeera Eng, plus 20 others

DTG-8 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?

regional news image
BBC London 4.9m homes 18.4%
from London W1A 1AA, 30km southeast (138°)
to BBC London region - 55 masts.
regional news image
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?

1984-971997-981998-20122012-1318 Apr 2018

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
Mux 1*, Mux 2*, Mux A*, Mux B*(-14dB) 400W
Mux C*, Mux D*(-17dB) 200W

Which companies have run the Channel 3 services in the Crystal Palace transmitter area

Sep 1955-Jul 1968Associated-Rediffusion†
Sep 1955-Jul 1968Associated TeleVision◊
Jul 1968-Dec 1992Thames†
Jul 1968-Feb 2004London Weekend Television♦
Jan 1993-Feb 2004Carlton†
Feb 2004-Dec 2014ITV plc♦
Feb 2004-Dec 2014ITV plc†
Feb 1983-Dec 1992TV-am•
Jan 1993-Sep 2010GMTV•
Sep 2010-Dec 2014ITV Daybreak•
• Breakfast ◊ Weekends ♦ Friday night and weekends † Weekdays only. Hemel Hempstead was not an original Channel 3 VHF 405-line mast: the historical information shown is the details of the company responsible for the transmitter when it began transmitting Channel 3.

Monday, 13 May 2013
Denis Turton
11:58 AM
Hemel Hempstead

Hi, many thanks for your reply-my post code is HP3 0AJ. Tuned to channels 44,55 & 59-signal strength 55 to 60% but no indication of signal quality.

Kindest regards,

Denis Turton.

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Denis Turton's 2 posts GB flag
Denis's: mapD's Freeview map terrainD's terrain plot wavesD's frequency data D's Freeview Detailed Coverage
Thursday, 5 December 2013
7:32 PM

is the signal from Hemel Hempstead (Hertfordshire horisontal or vertical?

if this is stated above I could not findit.

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jim's 1 post GB flag
Dave Lindsay

7:53 PM

jim: Alongside each multiplex, on the green bar, it says "vertical".

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Dave Lindsay's 5,724 posts GB flag

7:53 PM

jim: It's vertical, beneath the column heading "aerial position" above.

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Michael's 358 posts GB flag
Wednesday, 11 December 2013
trevor montgomery
9:10 PM

Question:- Is there a future intention to add BBC4 HD and BBC HD news to the Hemel Hempstead transmitter. At reception location WD232AQ Crystal Place is unreliable in bad weather conditions/refraction angle, Sandy and Hannington are even less HD reliable and don't carry local london news and that's all using a 27m mast, 20db forward gain aerial and 1.7db nf mast preamp. Satellite signal is no problem but video bandwidth/picture quality is less than freeview plus it very messy to switch from freeview to freesat just for two channels.

link to this comment
trevor montgomery's 1 post GB flag
trevor's: mapT's Freeview map terrainT's terrain plot wavesT's frequency data T's Freeview Detailed Coverage
Dave Lindsay

9:23 PM

trevor montgomery: No, not in the foreseeable future at least.

The new Sandy Heath HD mux will be co-channel with that of Hannington, so even if you used it you might find it wiped out at times. The power of the new mux from Crystal Palace is 36.3kW as against 200kW for the other six channels.

link to this comment
Dave Lindsay's 5,724 posts GB flag
Dave Lindsay

9:36 PM

trevor montgomery: Have you fitted aircraft warning lights on your aerial?

If you can receive the new multiplex (C33) from Crystal Palace then you could diplex your Hemel Hempstead aerial with it so as to use Hemel Hempstead for all viewing except the new HD mux.

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Dave Lindsay's 5,724 posts GB flag
Dave Lindsay

9:57 PM

trevor montgomery: As you may be aware the cause of your difficulty with reception from Crystal Palace is the high ground at Bushey Heath and Stanmore Common, which is heavily tree-laden.

With this in mind, the use of a high-gain aerial is probably best not advised as it means that the "beam" width you're receiving across is narrower - it's that narrow angle which you're relying on for good quality. A lower gain aerial would provide a wider acceptance angle and therefore "poor" quality over a narrow part of its acceptance angle wouldn't deminish the quality of the signal coming down the lead as much (of course that isn't to say that it will be good enough).

The point is that with digital you have strength and quality. You can make the signal stronger by amplifying it but quality starts at the aerial.

I write these comments as a technical bod rather than an aerial installer. I have, however, taken this knowledge from one of the experts on here and it makes perfect sense.

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Dave Lindsay's 5,724 posts GB flag
Thursday, 26 December 2013
12:29 PM
Hemel Hempstead

The only chance of getting all the BBC HD channels from Hemel (or indeed any Freeview transmitter) is if standard DVB is dropped in favour of DVB-T2. That would allow all the BBC HD channels to fit in the BBC A mux.

If the 700Mhz band is taken for 5G mobile in a few years, this will have to happen anyway.

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gtibb's 14 posts GB flag
gtibb's: mapG's Freeview map terrainG's terrain plot wavesG's frequency data G's Freeview Detailed Coverage

1:59 PM

gtibb: There is only room for five HD channels on a single DVB-T2 multiplex at present, so even allowing for BBC Parliament remaining in SD (which would seem sensible as a cost saver) the capacity would have to increase somewhat to fit in 10 radio stations plus red button HD alongside all the other BBC HD channels. It will be interesting to see if PSB3 continues to carry BBC1&2 HD plus ITVHD and Channel 4HD. This would actually be more sensible as there would then be one multiplex for regional content, allowing PSB1 to be a national service on fewer frequencies than at present, also only one multiplex (PSB3) would then need to be transmitted from regional correction stations. It is possible, however, that only the COM muxes will switch to DVB-T2 in 2018 since if the level of DVB-only equipment remains too high at that time Ofcom is likely to require PSB1 and PSB2 to continue in SD as at present until some later date in order to maintain a service to viewers with older equipment.

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KMJ,Derby's 1,811 posts GB flag
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