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Full Freeview on the Rowridge (Isle Of Wight, England) transmitter

first published this on - UK Free TV
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The symbol shows the location of the Rowridge (Isle Of Wight, England) transmitter which serves 620,000 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 Rowridge (Isle Of Wight, 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 Rowridge 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
 H max
C24 (498.0MHz)
320mDTG-3200,000W
200,000W
Channel icons
1 BBC One (SD) South, 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
 V max
 H max
C27 (522.0MHz)
320mDTG-3200,000W
200,000W
Channel icons
3 ITV (SD) (Meridian (South Coast 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 (Meridian south coast),

PSB3
BBCB
 V max
 H max
C21+ (474.2MHz)
320mDTG-6200,000W
200,000W
Channel icons
56 5SELECT, 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, 106 BBC Four HD, 109 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others

COM4
SDN
 H -6dB
 V -6dB
C25 (506.0MHz)
299mDTG-850,000W
50,000W
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 -6dB
 V -6dB
C22+ (482.2MHz)
302mDTG-850,000W
50,000W
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 -6dB
 V -6dB
C28 (530.0MHz)
302mDTG-850,000W
50,000W
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

LSO
 H -13dB
C37 (602.0MHz)299mDTG-1210,000W
Channel icons
from 22nd December 2014: 7 That's Solent,

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 Rowridge transmitter?

regional news image
BBC South Today 1.3m homes 4.9%
from Southampton SO14 7PU, 26km north (354°)
to BBC South region - 39 masts.
regional news image
ITV Meridian News 0.9m homes 3.6%
from Whiteley PO15 7AD, 24km north-northeast (20°)
to ITV Meridian (South Coast) region - 39 masts.
All of lunch, weekend and 50% evening news is shared with all of Meridian plus Oxford

Are there any self-help relays?

Portsmouth DocksTransposer2 km N city centre50 homes Estimate. Group of houses'

How will the Rowridge (Isle Of Wight, England) transmission frequencies change over time?

1950s-80s1984-971997-981998-20122012-132 May 2018
VHFA K TA K TA K TA K TW T
C3BBCtvwaves
C21C4wavesC4wavesC4waves+BBCBBBCB
C22+ArqAArqA
C24BBC2wavesBBC2wavesBBC2wavesBBCABBCA
C25SDNSDN
C27ITVwavesITVwavesITVwavesD3+4D3+4
C28ArqBArqB
C29LSO
C31BBC1wavesBBC1wavesBBC1wavescom7
C37com8
C55tv_offcom7tv_off
C56tv_offCOM8tv_off

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 7 Mar 12 and 21 Mar 12.

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

Analogue 1-4 500kW
PSB1||, PSB1≡, PSB2||, PSB2≡, PSB3||, PSB3≡(-4dB) 200kW
COM4≡, COM4||, COM5≡, COM5||, COM6≡, COM6||(-10dB) 50kW
com7≡(-13.1dB) 24.4kW
Mux 1*, Mux 2*, Mux A*, Mux B*, Mux C*, Mux D*(-14dB) 20kW
com8≡(-14.3dB) 18.4kW
LSO≡(-17dB) 10kW

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

Aug 1958-Jan 1992Southern Television
Jan 1982-Dec 1992Television South (TVS)
Jan 1993-Feb 2004Meridian
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. Rowridge 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, 24 February 2013
J
jb38
sentiment_very_satisfiedPlatinum

7:57 PM

Roy Barton: Just noticed that Jamie has made a posting earlier on regarding the subject of polarity, me having likewise composed a reply earlier on elsewhere then copied and pasted it into the sites reply box "without" having checked first.

link to this comment
jb38's 7,179 posts GB
R
Roy Barton
8:33 PM
Wimborne

Roy Barton:

If as Jamie says the V and H signals are identical then they add up to a signal at 45 degress polarisation. Is that right?

If that is the case then I can't really see the point... unless it just a convenient way of getting a large signal that has V and H components.

Possibly a higher power from an transmitter antenna at 45 degrees migh be impractical.

I wonder what an omnidirectional H antenna looks like?

Probably the complexity of a omnidirectional aerial at 45 degrees makes it easier to have separate V and H ???

link to this comment
Roy Barton's 13 posts GB
R
Roy Barton
10:28 PM
Wimborne

To JB38. I too missed your posts when I replied to Jamie. Actually I did understand that you were being hypothetical in regard to combining signals. Your diplexing hypothesis triggered the thoughts I had on how H and V transmissions might interfere with each other if an aerial picked up both polarisations. With every post I get a better understanding.
We have just had another day of perfect reception on all channels. At this rate I won't have to dig out the satellite kit that purchased more than year ago and have not unpacked yet.

link to this comment
Roy Barton's 13 posts GB
Monday, 25 February 2013
J
jb38
sentiment_very_satisfiedPlatinum

9:18 PM

Roy Barton: I don't think that Jamie was referring to anything connected to signal strength but more the case of the technical characteristics of the actual signals themselves being identical from both aerials, which of course they are, although problems can still be experienced as referred to in the next paragraph.

Although I am not privy to the details of the aerial set up at Rowridge, the reason for the high power radiating on vertical polarity is to avoid the possibility it causing interference to distant stations and not connected in anyway to the station providing some form of slant polarisation, because as far as using an H and V polarised aerial diplexed together to receive signals from the Rowridge mast is concerned this type of thing is really a non starter, because rather than provide the best of both worlds its liable to be the opposite by it creating the potential for possible phase clash problems to occur in locations where the horizontal signal is received at a reasonably high level, viewers at distances being somewhat better off because of the horizontal component being low.

The only type of situation where a pair of identical aerials facing the same transmitter is capable of giving great results is when they are arranged as a phased pair, the setting up of same really being outwith the domain of most (excl engineers) except the most dedicated enthusiast armed with a high quality signal meter, as it takes the utmost precision (as well as a good deal of patience!) to set up this type of system otherwise no advantage whatsoever is gained, plus even when perfectly set up the advantage can be lost if the signals being received are corrupted by ground reflections etc which unbalances the system.

Of course this type of set up is used more for killing off a signal that's not wanted in favour of the one that is.



link to this comment
jb38's 7,179 posts GB
Sunday, 3 March 2013
J
John
10:05 AM

I have bad break up,freezing on the following Channels 11,12,17,29,32,36,46,48,and 82.
Plus I get picture freezing etc when I turn on lights or use power devices.

Why, and what can I do to improve the situation.
Any advice would be appreciated.

link to this comment
John's 1 post GB
K
KMJ,Derby
sentiment_satisfiedGold

11:33 AM

John: What is the signal strength and quality on C22 compared with say C24 or C25? Select the frequency as if doing a manual tune, but do not press store or save to take readings of the signal being received. If C22 is shown as having lower strength or quality than the other frequencies it could be that the aerial needs slight repositioning to get a clearer view of that particular signal. With regard to interference from switches etc it is advisable to have good quality double screened coax for the downlead and any fly leads to prevent interference pick-up by the cable. Having the aerial mounted for vertical polarisation might prove beneficial, depending on your location, as the COM muxes including C22 are transmitted at 200kW vertical and only 50kW horizontal from Rowridge. If replacing your aerial a log periodic, or a group A yagi fitted with a pcb balun should be chosen for reception from Rowridge. Avoid the wideband models on offer in DIY outlets as these do not perform particularly well on the lower UHF frequencies as used at Rowridge. A good installer should automatically fit the correct aerial type as suggested above.

link to this comment
KMJ,Derby's 1,811 posts GB
J
Jamie
sentiment_satisfiedSilver

6:34 PM
Portsmouth

JOHN-

To assist you can you please provide

Your location
The type of aerial you have ie red or black tipped
The location of your aerial
How many TVs connect to the aerial
Do you have an amplifier

thanks

Jamie
Qualified Aerial Installer

link to this comment
Jamie's 207 posts GB
Monday, 29 April 2013
Idris Martin
6:08 PM

I may have posed this question on here before but now I have more data.
I live in Weymouth & have installed a Group A high gain aerial with a mast head + 25 DB booster.
I obtained a compass bearing from my house to the Rowridge transmitter from the local Coastguard station of 86 degrees & lined it up exactly.
I can get good strength signals on multiplex channels 24, 25, 27,& 28, but on channel 22 which has 2 stations I require, Sky News & Dave the signal strength is pretty steady @ 64 but quality poor to nil.
The modulation alternates between 64QAM to QPSK, I have no idea what this means.
If anybody can give me an explanation why when all of the other channels are ok why should 22 be any different when they are all produced from the same transmitter.

link to this comment
Idris Martin's 16 posts GB
Tuesday, 30 April 2013
J
jb38
sentiment_very_satisfiedPlatinum

8:18 AM

Idris Martin: Although the channels referred to might well come from the same mast they are all being radiated from different heights on the mast (BBC at top) by a series of phased panels positioned around it at these different levels, and with this type of system no matter how carefully these panels are positioned the signals beamed out from the mast will never be anything even remotely resembling parallel lines, hence the main beam from some channels might suffer from one of the three main problems that can affect an RF signal, and being - reflection / diffraction / scattering, whereas another beam might not hence why the difference in levels.

The fact of you having previously reported that Ch22 can vary dependant on whether it be a sunny day or not somewhat indicates that Ch22's the signal path suffers from one of the aforementioned potential problems, and of course the further away a person might be from a transmitter (48 miles in your case) the greater the chance of being affected.

link to this comment
jb38's 7,179 posts GB
Idris Martin
10:00 PM

Well thanks jb38 for the info it seems I will just have to grin & bear it.

link to this comment
Idris Martin's 16 posts GB
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