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Full Freeview on the Oxford (Oxfordshire, England) transmitter

first published this on - UK Free TV
sa_streetviewGoogle Streetviewsa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps51.790,-1.179 or 51°47'25"N 1°10'46"Wsa_postcodeOX3 9SS

 

The symbol shows the location of the Oxford (Oxfordshire, England) transmitter which serves 410,000 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 Oxford (Oxfordshire, England) mast?

Oxford transmitter - Oxford transmitter: Possible effect on TV reception week commencing 19/09/2022 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 Oxford 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
 H max
C41+ (634.2MHz)295mDTG-3100,000W
Channel icons
1 BBC One (SD) South (Oxford), 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 16 others

PSB2
D3+4
 H max
C44- (657.8MHz)295mDTG-3100,000W
Channel icons
3 ITV (SD) (Meridian/Central (Thames Valley micro region)), 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, 26 ITV4, 30 E4 +1, 35 ITV +1 (Central west),

PSB3
BBCB
 H max
C47 (682.0MHz)295mDTG-6100,000W
Channel icons
56 5SELECT, 101 BBC One HD (England no regional news), 102 BBC Two HD (England), 103 ITV HD (ITV Central West), 104 Channel 4 HD South ads, 105 Channel 5 HD, 106 BBC Four HD, 109 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others

COM4
SDN
 H -3dB
C29 (538.0MHz)295mDTG-850,000W
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
 H -3dB
C37- (601.8MHz)319mDTG-850,000W
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
 H -3dB
C31 (554.0MHz)319mDTG-850,000W
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

LOX
 H -10dB
C51 (714.0MHz)295mDTG-1210,000W
Channel icons
from 22nd December 2014: 7 Thats Oxford,

com7
 H -7.9dB
C55 (746.0MHz)295mDTG-616,400W
Channel icons


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
DTG-12 QSPK 8K 3/4 8.0Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)

Which BBC and ITV regional news can I watch from the Oxford transmitter?

regional news image
BBC South (Oxford) Today 0.4m homes 1.6%
from Oxford OX2 7DW, 6km west-southwest (258°)
to BBC South (Oxford) region - 6 masts.
BBC South (Oxford) Today shares 50% content with Southampton service
regional news image
ITV Meridian News 0.9m homes 3.4%
from Whiteley PO15 7AD, 102km south (183°)
to ITV Meridian/Central (Thames Valley) region - 15 masts.
Thames Valley opt-out from Meridian (South). All of lunch, weekend and 50% evening news is shared with all of Meridian+Oxford

How will the Oxford (Oxfordshire, England) transmission frequencies change over time?

1950s-80s1984-971997-981998-20112011-132013-182013-1723 May 2018
VHFC/D EC/D EC/D EC/D EC/D E TW TW T
C2BBCtvwaves
C29SDN
C31com7com7
C37com8com8
C41BBCA
C44D3+4
C46_local
C47BBCB
C49tv_offC5wavesC5waves
C50tv_off SDNSDN
C51tv_offLOXLOX
C53tv_offC4wavesC4wavesC4waves+BBCA+BBCA+BBCA
C55tv_offArqBArqBArqBcom7tv_off
C56tv_offCOM8tv_off
C57tv_offBBC1wavesBBC1wavesBBC1wavesBBCBBBCBBBCB
C59tv_off-ArqA-ArqA-ArqA
C60tv_offITVwavesITVwavesITVwaves-D3+4-D3+4-D3+4
C62SDN
C63BBC2wavesBBC2wavesBBC2waves

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 14 Sep 11 and 28 Sep 11.

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

Analogue 1-4 500kW
BBCA, D3+4, BBCB(-7dB) 100kW
SDN, ARQA, ARQB(-10dB) 50kW
Analogue 5(-11dB) 40kW
com8(-14.7dB) 17.1kW
com7(-14.8dB) 16.4kW
Mux 1*, Mux 2*, LOX(-17dB) 10kW
Mux C*, Mux D*(-18dB) 8kW
Mux A*, Mux B*(-19.2dB) 6kW

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

Feb 1956-Jul 1968Associated TeleVision†
Feb 1956-Jul 1968Associated British Corporation◊
Jul 1968-Dec 1981Associated TeleVision
Jan 1982-Dec 2006Central Independent Television
Dec 2006-Feb 2009ITV Thames Valley
Feb 2009-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. Oxford 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
Wednesday, 4 January 2012
N
nicola
8:15 PM

thanks Dave
It isnt variable and turning of the power to it gives us nothing, do you suggest getting a variable booster

link to this comment
nicola's 8 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

8:33 PM

nicola: At about four miles from the transmitter, there is quite a possibility that you could remove the power booster and replace it with a non-powered splitter.

If you still have issues with reception (like you have now) then you might need an attenuator as well.

If I were you, I'd try disconnecting booster and connecting the incoming aerial lead to one of the feeds to one of the Freeview boxes. Then try the same with the other box and see what you get.

link to this comment
Dave Lindsay's 5,724 posts GB
Thursday, 12 January 2012
N
nicola
2:13 PM

Hi Dave,

Both TVs are running of a splitter now and recieving good-very good signal. I managed to get both boxes record the same programme to check that having both on wasnt causing problems. That checked out ok but after an hour of watching and recording my box suddenly stated no signal when trying a channel, but signal details hadnt changed.
I reset the box completely and rescanned several times before getting everything back.
Watching seems ok but when recording anything I get constant skipping again, it seems to be bbc one mainly, Is it worth trying an attenuator for my box, would you suggest a variable one or a specific db

Its great that you are helping

link to this comment
nicola's 8 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

3:28 PM

nicola: I would get a variable attenuator, such as that which is shown on the other page entitled "Freeview signals: too much of a good thing...". These usually give you a range up to 20dB.

Put variable attenuator into eBay and some will come up.

I would try putting it on the feed into one of the boxes. If 60 or 70% strength gives 100% quality, then I would try it at that.

If it works, then you might try putting the attenuator before the splitter and adjusting so that both devices work.

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

3:34 PM

nicola: Watch out because some of the attenuators have F-connectors (which are the threaded and therefore need screwing together) and some have the coax connectors on (the sort you just plug in as found on the back of TVs and recorders).

The most commonly encountered type of connector used for terrestrial aerials are the plug in coax ones, so you probably want one of these. For example:

TV Aerial Attenuator Variable 0-20Db Freeview Digital | eBay

eBay - The UK's Online Marketplace

link to this comment
Dave Lindsay's 5,724 posts GB
Saturday, 14 January 2012
N
nicola
7:53 AM

Hi Dave here is an update, I have been running both boxes on the splitter and have come across a few things, Both boxes get a blank screen when going onto really, and itv2+1 Prob others too. both boxes are skipping when recording.
my box states signal quality good, signal level around 70% so I am worried that I need to boost this rather than use an attenuater to dampen.

link to this comment
nicola's 8 posts GB
Monday, 16 January 2012
Dave Lindsay
sentiment_very_satisfiedPlatinum

10:13 AM

nicola: Be aware that the three commercial (COM) multiplexes are currently on much lower power from Oxford than its Public Service Broadcaster (PSB) ones.

Thus, you will have to ensure that you attenuate enough to make the PSBs watchable without attenuating the COMs too much so as to make them too weak for your machine to show a picture.

On 18th April the COMs will go to their full final power, which will be lower than that of the PSBs (which are already at their full final power). So it is to be expected that there is a difference in signal strength.

The scale on different boxes will differ, so ultimately it is try it and see. As an example, my Sony recorder (HXD-RDR870) gave strengths of around 50 to 60% before switchover and it worked fine. The quality was 100% and therefore the picture wasn't degraded.

If the 70% is on BBC or ITV1/C4 and ITV2+1, Really is breaking up or gone, then you need to reduce your attenuation to let some more of the signals through.

For a full list of Freeview services and what multiplex they are carried on, see here:

DTG :: DTT Services by Multiplex

Basically, I would look at the first service in each multiplex. So check BBC One, ITV1, BBC One HD (if applicable), ITV3, Pick TV and Yesterday. As I say, the trick will be not to attenuate too much so as to loose the last three, but enough to reduce the level of the first three enough.

Come 18th April this will be easier because the COMs won't be so weak with respect to the PSBs.

link to this comment
Dave Lindsay's 5,724 posts GB
N
nicola
5:03 PM

Hello again,

I just checked the channels that you suggested and I dont get ITV3 and PickTV at all despite them showing up on the program guide.This is without a booster or attenuator connected, would an antenuator not make this worse rather than better and would a variable booster be better until the signal strength of the transmitter is at full power again.


link to this comment
nicola's 8 posts GB
D
David Pinfold
sentiment_satisfiedBronze

7:36 PM
Banbury

Nicola - where you are located you should not have any problems receiving any of the channels, even with the power restrictions on the commercial multiplexes. You should easily be able to passively split the signal to 2 receivers. Either there is too much signal (likely if you have a roof mounted aerial) or you have fault (Bad connection, short circuit in the aerial cable etc). My advice would be to have it checked by a profeesional aerial rigger.

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David Pinfold's 42 posts GB
Tuesday, 17 January 2012
Dave Lindsay
sentiment_very_satisfiedPlatinum

5:48 PM

nicola: It is a possibility that the reason your receiver isn't picking up two of the (weaker) COMs is because the strong PSBs is desensitising your receiver.

That is, it is less sensitive to the weaker COMs because it is reacting to the strong PSBs.

Change to ITV3 and bring up the signal strength meter. Now connect the attenuator into the aerial lead and turn it and see what happens. Get an idea of where the strength is at its highest. See if adding attenuation actually increases it.

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Dave Lindsay's 5,724 posts GB
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