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Freeview Light on the Carhampton (Somerset, England) transmitter

first published this on - UK Free TV
sa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps51.174,-3.409 or 51°10'27"N 3°24'32"Wsa_postcodeTA24 6UZ

 

The symbol shows the location of the Carhampton (Somerset, England) transmitter which serves 700 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 Carhampton (Somerset, 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 Carhampton 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
C24 (498.0MHz)85mDTG-320W
Channel icons
1 BBC One (SD) West, 2 BBC Two England, 9 BBC Four, 201 CBBC, 202 CBeebies, 231 BBC News, 232 BBC Parliament, 250 BBC Red Button, plus 16 others

PSB2
D3+4
 V max
C27 (522.0MHz)85mDTG-320W
Channel icons
3 ITV (SD) (West), 4 Channel 4 (SD) South ads, 5 Channel 5, 6 ITV 2, 10 ITV3, 13 E4, 14 Film4, 15 Channel 4 +1 South ads, 18 More4, 25 ITV4, 29 E4 +1, 34 ITV +1 (West),

PSB3
BBCB
 V max
C21+ (474.2MHz)85mDTG-620W
Channel icons
72 Shopping Quarter , 101 BBC One HD (England no regional news), 102 BBC Two HD (England), 103 ITV HD (ITV Meridian Southampton), 104 Channel 4 HD South ads, 105 Channel 5 HD, 204 CBBC HD, plus 1 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
H/V: aerial position (horizontal or vertical)

Are you trying to watch these 52 Freeview channels?

the effected channels
the effected channels
the effected channels
the effected channels

The Carhampton (Somerset, England) mast is a public service broadcasting (PSB) transmitter, it does not provide these commercial (COM) channels: 4Music, 4seven, 5SELECT, 5STAR, 5USA, Aljazeera English, BBC Four HD, BBC News HD, Blaze, Blaze +1, CBeebies HD, CBS Drama, CBS Justice, CBS Reality, Challenge, Channel 5 +1, CITV, YAAAS!, Dave, Dave ja vu, DMAX, Drama +1, Film4 +1, Food Network, Forces TV, FreeSports, GB News, GREAT! movies, GREAT! movies action, HGTV, Horror Channel, ITV2 +1, ITV3 +1, ITV4 +1, ITVBe +1, More4 +1, Now 70s, Paramount Network, PBS America +1, pick, Quest +1, Quest Red, Quest Red +1, Really, RT HD, Sky Arts, Sky News, Smithsonian Channel, Talking Pictures TV, TCC, Together TV, Yesterday +1.

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 Carhampton transmitter?

regional news image
BBC Points West 0.9m homes 3.4%
from Bristol BS8 2LR, 64km east-northeast (61°)
to BBC West region - 60 masts.
regional news image
ITV West Country News (East) 0.9m homes 3.4%
from Bristol BS4 3HG, 66km east-northeast (64°)
to ITV West region - 61 masts.
All of lunch, weekend and 50% evening news is shared with West Country (West)

How will the Carhampton (Somerset, England) transmission frequencies change over time?

1984-971997-981998-20102010-135 Jun 2019
A K TA K TA K TA K TA K T
C21BBC1wavesBBC1wavesBBC1waves+BBCBBBCB
C24ITVwavesITVwavesITVwavesBBCABBCA
C27BBC2wavesBBC2wavesBBC2wavesD3+4D3+4
C31C4wavesC4wavesC4waves

tv_off Being removed from Freeview (for 5G use) after November 2020 - 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 24 Mar 10 and 7 Apr 10.

How do the old analogue and currrent digital signal levels compare?

BBCA, D3+4, BBCB 20W
Analogue 1-4(-4dB) 8W

Which companies have run the Channel 3 services in the Mendip transmitter area

Jan 1958-Jul 1968Television Wales and the West
Jul 1968-Feb 2004Harlech Television
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. Carhampton 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
Sunday, 28 July 2019
S
Steve Hill
5:48 PM

Chris.SE: Hey, that's ok. I just don't think it's interference from any source. Wenvoe, Carmel and Mendip, to name a few, share common frequencies with no problems. I will get to the bottom of it eventually!

link to this comment
Steve Hill's 10 posts GB
Tuesday, 30 July 2019
N
Norman D. Landing
6:59 AM

Steve Hill: Now that the weather has changed, can you say if there has been any improvement? Those postcodes (other than the third) are well within the predicted coverage for Carhampton, so the issue is likely to be either CCI or local interference,


Chris, not entirely sure what your nattering about? Mellie? As for understanding Arqivas systems, i occasionally have to work alongside them in my official capacity, and as the systems I am responsible for have the potential to cause drastic problems to Arqiva, I have to understand how they interact. Were both subject to the same laws of physics.

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Norman D. Landing's 1 post GB
C
Chris.SE
sentiment_very_satisfiedPlatinum

1:55 PM

I'm obviously mixing you up with someone else, apols.

link to this comment
Chris.SE's 2,548 posts GB
Wednesday, 31 July 2019
S
Steve Hill
5:43 PM

Norman D. Landing: No improvement at all. I spent Monday morning driving around the relay with an aerial, fine in all directions except a corridor to the East of the relay that takes in those postcodes. I went on the BBC's coverage checker and for those postcodes it said there were no channels available from the Carhampton relay and the best one to go for was Carmel. My customers don't want Welsh tv!
Regarding interference from Carmel, I don't think that's the case because the Porlock relay uses the same frequencies as Carhampton and is not affected at all by Carmel, even though it's stronger there. It's almost as though Carhampton's footprint has changed!

link to this comment
Steve Hill's 10 posts GB
N
Norman D. Landing
6:20 PM

Steve Hill: Hmmm, that does seem very odd! I note that midway between the area and the relay there are some woods showing on google earth - could those have grown up and be blocking the signal? Anything been built in that direction recently?

Do you happen to have a spectrum analyser available that you could look for odd interferring signals with?

I wonder, are you able to use a portable set and drive to places between the affected area and the relay, to see if you can find a spot where the signal is usable?

link to this comment
Norman D. Landing's 1 post GB
L
Lee Maidens
7:03 PM

I dont have any signal at all not even dab in car

link to this comment
Lee Maidens's 1 post GB
C
Chris.SE
sentiment_very_satisfiedPlatinum

10:01 PM

Lee Maidens:

Could you be a little more specific please? Location/postcode, have you previously received the Carhampton relay and what sort of signal did you have? Put your postcode into Digital UK - Coverage checker to see what the predicted reception is.

Steve Hill:

I assume the antenna at Carhampton visually looks as though it should radiate eastwards - ie no missing aerials/panels? Also this isn't the first time I've heard/come across the BBC checker conflicting with the Digitaluk checker.

link to this comment
Chris.SE's 2,548 posts GB
Thursday, 1 August 2019
C
Chris.SE
sentiment_very_satisfiedPlatinum

12:34 AM

Steve Hill; & Norman D Landings:

Hmm this is definitely a mystery. The suggestion about the woods is worth looking at. I thought I would try and do a bit of research on the situation prior to the problems, and trying to locate the right kind of historic information was not easy.

Steve, did this start on Jul 17th?

I note that on the Digitaluk checker it notes a reception change on the 17th July, but I cannot find out by how much it changed! These events are usually due to other transmitters changing to the same UHF channels on that date. I listed some of the other transmitters using the same channels but none of these changed on the 17th, in fact they were all using those channels previously and the only change that most & Carhampton had was on the 5th June when the PSB3/BBCB (HD) mux had the channel offset removed.

BUT oops, I didn't mention & missed one very important tx that did move to the same UHF channels on the 17th and that's Kilvey Hill, also using vertical polarisation. And it has 2kw power, whilst that's not huge I reckoned just being the other side of the channel it could be enough to be an issue. When I look at it's predicted coverage map it does show coverage all over your area at Carhampton, Old Cleeve & West Quantoxhead albeit a poorer signal !! I'm thinking oh dear Arqiva & OFCOM have fouled up here!

Steve, from the postcodes you gave, the bearing for Kilvey Hill is not vastly different from Carhampton and i reckon it could be sufficiently within the beam angle of the antenna pointed at Carhampton!
Can you experiment and see if a) you can pick up Kilvey Hill by careful aerial pointing, and b) by angling the aerial further away from Kilvey HIll's bearing (ie. anticlockwise - more southerly) if you can then get Carhampton ok.

I'll be interested on your thoughts on all this.

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Chris.SE's 2,548 posts GB
Friday, 2 August 2019
S
Steve Hill
5:22 PM
Minehead

Norman D. Landing: Yes I've driven round with an aerial and my meter, to the west of the relay I found no problems, even to the east all was well at postcode TA24 6HX yet 200 yards up the road I was getting an identical strength reading but no signal quality, this seemed to be the case right around to Bilbrook at TA24 6HD but then at Withycombe between Bilbrook and Carhampton the signal quality returned.

I was sitting on a bungalow roof looking at the relay, no more than two miles away, nothing in the way, no new buildings or large trees.

link to this comment
Steve Hill's 10 posts GB
S
Steve Hill
5:27 PM

Chris.SE: Kilvey Hill is an interesting thought, it's not strong enough to be useable in Carhampton though, I did look for it while I was doing my testing but could barely pick it up on my meter. I did try panning the aerial to the south and yes Carhampton did start to come in, I assumed it was a reflection off the hills but looks like I might have been wrong!

link to this comment
Steve Hill's 10 posts GB
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