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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.

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.

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

MuxH/VFrequencyHeightModeWatts
PSB1
BBCA
 V max
C40 (626.0MHz)214mDTG-32,000W
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, 250 BBC Red Button, plus 15 others

PSB2
D3+4
 V max
C43 (650.0MHz)214mDTG-32,000W
Channel icons
3 ITV (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, 30 E4 +1, 35 ITV +1 (London),

PSB3
BBCB
 V max
C46 (674.0MHz)214mDTG-62,000W
Channel icons
56 5SELECT, 101 BBC One HD (England no regional news), 102 BBC Two HD (England), 103 ITV HD (ITV London), 104 Channel 4 HD London ads, 105 Channel 5 HD, 106 BBC Four HD, 109 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others

COM4
SDN
 V max
C37 (602.0MHz)214mDTG-82,000W
Channel icons
12 Quest, 20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 41 Legend, 42 GREAT! movies action, 46 Channel 5 +1, 58 ITVBe +1, 59 ITV3 +1, 64 Blaze, 67 CBS Reality, 74 Dave ja vu, 78 TCC, 81 Blaze +1, 89 ITV4 +1, 203 CITV, 208 POP MAX, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, plus 15 others

COM5
ArqA
 V max
C31 (554.0MHz)230mDTG-82,000W
Channel icons
11 Sky Arts, 17 Really, 19 Dave, 31 E4 Extra, 36 pick, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 57 Smithsonian Channel, 60 Drama +1, 70 Quest +1, 75 Yesterday +1, 83 Together TV, 233 Sky News, plus 8 others

COM6
ArqB
 V max
C29 (538.0MHz)230mDTG-82,000W
Channel icons
 FreeSports, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 71 Quest Red +1, 73 HobbyMaker, 82 Talking Pictures TV, 84 PBS America, 88 Classic Hits, 235 Aljazeera English, plus 19 others

DTG-3 64QAM 8K 2/3 24.1Mb/s DVB-T MPEG2
DTG-6 256QAM 32KE 2/3 40.2Mb/s DVB-T2 MPEG4
DTG-8 64QAM 8K 3/4 27.1Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)

Are you trying to watch these 0 Freeview HD channels?


The Hemel Hempstead (Hertfordshire, England) mast is not one of the extended Freeview HD (COM7 and COM8) transmitters, it does not provide these high definition (HD) channels: .

If you want to watch these HD channels, either use Freesat HD, or move your TV aerial must point to one of the 30 Full Freeview HD transmitters. For more information see the want to know which transmitters will carry extra Freeview HD? 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
B E TB E TB E TE TK T
C29ArqB
C31ArqA
C34_local
C37SDN
C40BBCA
C41ITVwavesITVwavesITVwavesD3+4
C42_local
C43D3+4
C44BBC2wavesBBC2wavesBBC2wavesBBCA
C46BBCB
C47C4wavesC4wavesC4wavesBBCB
C50tv_offSDN
C51tv_offBBC1wavesBBC1wavesBBC1waves
C55tv_offArqB
C59tv_offArqA

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

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.

Comments
Friday, 20 April 2012
Transmitter engineering
sentiment_very_satisfiedOwner

4:29 AM

HEMEL HEMPSTEAD transmitter - Freeview BBC Digital TV Off Air; DSO related from 00:22 on 18 Apr to 01:05 on 18 Apr [BBC]

link to this comment
Transmitter engineering's 138,029 posts xx
Wednesday, 9 May 2012
A
Andrew Healy
2:34 PM
Ashford

James,

in Ashford, I am gforced to use the HH transm itter as my aerial is fixed verticvally (Crystal Palace needs a horizontal one). My reception from HH is OK, but, the ArqivaB multiplex is unreachable- not essential but an annoying glitch. Is there a plan to ramp up the actual power this multiplex ?

link to this comment
Andrew Healy's 11 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

3:52 PM

James: Have you replaced your Group B aerial with either a Group E one or a wideband one?

COM5 and COM6 are on the highest channels which are therefore the furthest away from Group B.

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

3:56 PM

Andrew Healy: I suspect that your problem is different to James's.

You would appear to be outside of HH's main area. Also, Digital UK Tradeview suggests that Midhurst's C55 BBC A mux could be the cause of your trouble. This is co-channel with HH's ArqB.

HH's two other Commercial multiplexes, 50 and 59, are co-channel with two of Midhurst's COMs, but these are at half transmission power with respect to its PSBs (including BBC A on C55).

link to this comment
Dave Lindsay's 5,724 posts GB
Tuesday, 12 June 2012
A
Alain
10:40 AM
Berkhamsted

Hi, I am in Berkhamsted, receiving from HH. Before switchover the signal was not brilliant. Now, BBCA and D3+4 are good and very stable but I cannot get SDN, ArqA nor ArqB. Can someone explain this? On the power graph above it seems each mux is transmitted at the same power, so I should receive them as well as the others, no?

Everyone around me seems to be getting their signal from HH (vertically positioned aerial), but is it possible we could get a better signal from CP?.

link to this comment
Alain's 3 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

11:04 AM

Alain: Can you manually tune to these three channels 50, 59, 55, and does your receiver give any indication of signal strength and quality when you do so? Different receivers are designed differently and some give more clues away than others so you might like to try different devices.

The only thing I can wonder is if you are picking up too much signal from another transmitter that uses these three channels, such as Midhurst because your aerial happens to be in a good spot for it.

As well as performing the above test, try a manual tune to C61 and C62 which are also used by Midhurst. See if these give any signal reading.

link to this comment
Dave Lindsay's 5,724 posts GB
A
Alain
7:13 PM
Berkhamsted

Dave L: Thanks for you comment. I'll try a manual tune and let you know what I get. However, I'm not sure if it will be possible as it's a tuner card in my PC and I don't have the manual anymore. I'll give it a try anyway.

Is Midhurst not horizontally polarised though? Is it possible to pick anything up with a vertical aerial?


link to this comment
Alain's 3 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

7:37 PM

Alain: To a lesser degree you vertical aerial will pick up horizontally polarised signals.

I have to say that when I made my posting, I was probably clutching at straws with regards a possible explanation.

A terrain plot shows that you are 50 miles from Midhurst with a few hills in the way, so it is probably unlikely to be the cause:


Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location


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Dave Lindsay's 5,724 posts GB
Wednesday, 13 June 2012
A
Alain
8:21 AM
Berkhamsted

Dave L: Nice graph from Megalithia! Indeed there seem to be obstacle in the way. Could the interferences come from Crystal Palace?

I've done some tests and it is puzzling: I don't get any signal above C44, which is at 100% (whatever that means). Since my card is not HD, I thought I maybe had some quirk in my wiring making it a low pass system cutting off above 700MHz. However, if I manually check C50, C55 and C59, I indeed get a signal strength of 0% but the software indicates that the signal is somehow "locked". I'll have to try and find a manual for my card online and see what this means.

Would you have any idea in the meantime?

link to this comment
Alain's 3 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

12:41 PM

Alain: Crystal Palace can't interfere with Hemel Hempstead because they are on different channels.

I have no idea what your problem might be. It might be worth searching the internet to see if others are in the same position.

There may be a firmware update for the device or there may be new drivers for it that will cure the problem.

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