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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
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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
Tuesday, 4 October 2011
C
Chris.SE
sentiment_satisfiedSilver

4:14 PM

Steve P: The Coax should NOT be earthed.
The aerial and coax installation should be "floating" and totally independant of any electrical earth.

link to this comment
Chris.SE's 251 posts GB
C
Chris.SE
sentiment_satisfiedSilver

4:33 PM

Jonathan: by the way do you know exactly what the aerial is? Also your view of the transmitter, is it "blocked" or just not visible due to gently rising ground.

link to this comment
Chris.SE's 251 posts GB
J
Jonathan
6:38 PM

Thanks to everyone for the many answers!

To clarify a few things:

(1) I am not exactly sure what my aerial is; it was replaced by Oxford Aerials in January 2010 and at the time improved our signal on both analogue and digital. My description as wideband high sensitivity may be wrong. There is no amplifier involved, however.

(2) Our view of Beckley is blocked by a combination of a gently rising hill and a pair of enormous beech trees. Historically our reception has been highly seasonal as leaves come and go on the beech trees.

(3) The coax drop lead is split at the attenuator, and also has a female-female converter to let me use two male-male leads. The leads are perhaps best described as "cheap" and may not be well screened.

(4) Originally I found it hard to see any pattern in anything when adjusting the variable attenuator. Later it became clear that this was because both the signal strength and quality readings changed as I lifted up the attenuator to twiddle it and put it down again. I have now found a position where the attenuator sits on a wooden cabinet and I can turn the knob in a reasonably reproducible way.

(5) The attenuator is as shown at AERIAL CABLE VARIABLE ATTENUATOR COAXIAL RF-TV FREEVIEW | eBay and I have been unable to locate any instructions.

(6) With the attenuator in its "stable" position I find that signal strength goes down on the multiplexes on 53, 57 and 60 as I turn it anticlockwise, but it varies remarkably little for what is suppose to be 20dB (e.g. from 45% to 30% over the full range). The signal quality on 53 and 57 is at 100% over the whole range; the quality on 60 is low and highly variable at fully anticlockwise and high and highly variable at fully clockwise.

(7) No other multiplexes are visible at either end of the range of the attenuator. I am doing a clean install from factory settings in each case.

(8) Removing the attenuator entirely (keeping the female-female adaptor in) greatly reduces signal strength and quality on all three multiplexes.


I am struggling to find an interpretation of all this that makes much sense. My best interpretation so far is that I have WAY too much signal so that even after 20dB attenuation I still have too much signal. (OX44EY)

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Jonathan's 10 posts GB
K
KEVIN GARDINER
sentiment_satisfiedBronze

6:52 PM

Spartan, no i'm not saying that a 20db plus or minus atteunator is not enough to solve Jonathans problem with his free-view reception.After his recent attempts to find the root of his problem, he stated that moving the co-axial cable to the television had more effect than his attuenator. Due to too much, or lack of signal , the co-axial cable will act like part of the aerial itself. you can get this effect if you have a low signal using a indoor type aerial.If you move the cable around, you can get a picture on the tv. Jonathan has too much signal and using a 20db variable attuenator is more than enough to turn the incoming signal down.
The signal strength from the Beckley transmitter is 75db on the 100kw muxes, and 78db on the 50kw muxes. He needs to put up a log periodic aerial on the roof at minimum height of 10 metres.The periodic aerial has no signal gain to the television, meaning the aerial will not amplify the signal.Jonathan he is only 5 miles from the Beckley transmitter, and within the strong signal area. The periodic aerial is the best aerial to install in the strongest signal areas. And it's the aerial that the BBC recommend in all cases, if the signal strength in your area is 65db or above.Amplifiers should only be used as a last resort to ensure reception, such as a place where your on the fringe reception area, or obstacles such as buildings or hills are obstructing the signal etc.
Amplifiers not only amplify the incoming signal, but they also amplify un-wanted atmospheric noise, which demonstrates itself as snow on the television picture, plus during high pressure periods, your television reception will be prone to interference from adjacent transmitters . (52.4471,-2.1045) 

link to this comment
KEVIN GARDINER's 68 posts GB
J
Jonathan
7:48 PM
Oxford

OK, I'm making more progress. Key thing was to insert the attenuator directly into the wall socket rather than the middle of the drop lead. I have it turned fully anticlockwise which I am interpreting as maximum attenuation (this gives the largest signal strength, which is counter intuitive, but I am assuming that the signal strength is so high that even at 20dB it is overloading the system, and so the strength reading can be counter-intuitive).

I have now gained channel 55, one of the four slightly lower power multiplexes. I am now getting signal quality of 100% on 53, 55, 57 and 60. Still missing 51, 59 and 62, but very little there I care about. I may try attenuating still further to see if that brings the final channels in.

link to this comment
Jonathan's 10 posts GB
R
Ralph
7:59 PM

It is a sad state of affairs when analogue reception (at my property in West Swindon) was reasonable with a good mix of channels but gradually during the digital switchover (and clearing / retuning on multiple occasions on one of the latest receivers) virtually all channels are now gone with the exception of the BBC ones. I appreciate we are on the fringes of reception but had hoped the transmission of a few simple channels at reasonable power levels could be achieved in this day and age.

Aerial installers have confirmed there is virtually no signal from any transmitter in our region despite the fact we are not living below sea level nor behind mountains.

I am a TV license payer and do expect to be provided with a service, I do not see why I should be forced to pay for Sky or watch TV via the Internet.

Perhaps someone can tell me whether there are issues at Oxford and that someone is aware of them and is working to resolve them or whether the current state is the best we can hope for.


link to this comment
Ralph's 5 posts GB
R
Richard
8:18 PM

In the 2 years+ leading to switch over we as good as lost MUX2 3 miles from Beckley. I followed advice and bought a new TV, aerial, amplifier (did check signal strength in case attenuator needed) etc all to no avail. 28th September I conscientiously retuned both TV and DVD recorder. Now there is almost perfect reception: even a picture on ITV with just a fly lead out the back of the set without connecting to an aerial. Conclusion: signal had been deliberately underpowered so I wasted a lot of time and money following what appears to have been a misinformation programme to keep every one hanging on and aerial men in business. Why no one could tel the truth: I could have saved money and cancelled my licence for 2 years.

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Richard's 10 posts GB
D
David Pinfold
sentiment_satisfiedBronze

8:28 PM
Swindon

Ralph - The Public Service muxes at Oxford are now at full power (100 KW) which broadcast the BBC channels & ITV1, Channel 4 & 5. If you can't get satisfactory reception of these then you are unlikely to get satisfactory reception from Oxford at all. You may wish to consider installing freesat (for a 1 off cost).It uses the same satellites as Sky but there is no subscription involved & there are more channels available (although not all the same ones) than with freeview.

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David Pinfold's 42 posts GB
J
jb38
sentiment_very_satisfiedPlatinum

9:32 PM

Richard: Not really knowing what method you used to test if an attenuator was required, but if you can get a reasonably viewable signal with only one end of a fly lead connected into the set, then the chances are that an attenuator could well be required if you are using a roof mounted aerial.

Maybe this even applying with a loft one as well, this dependant on location.

link to this comment
jb38's 7,179 posts GB
J
Jonathan
10:00 PM
Oxford

Given the success so far I have just ordered a 24dB fixed attenuator, which can be combined with my existing 0-20dB variable attenuator to give me a huge range. Will report back once this arrives.

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Jonathan's 10 posts GB
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