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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-200,000W
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, plus 17 others

PSB2
D3+4
 V max
 H max
C27 (522.0MHz)
320mDTG-200,000W
200,000W
Channel icons
3 ITV 1 (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, 28 ITVBe, 30 E4 +1, 35 ITV1 +1 (Meridian south coast),

PSB3
BBCB
 V max
 H max
C21+ (474.2MHz)
320mDTG-200,000W
200,000W
Channel icons
46 5SELECT, 101 BBC One HD South, 102 BBC Two HD England, 103 ITV 1 HD (ITV Meridian Southampton), 104 Channel 4 HD South ads, 105 Channel 5 HD, 106 BBC Four HD, 107 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
20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 38 Channel 5 +1, 41 Legend, 42 GREAT! action, 57 Dave ja vu, 58 ITVBe +1, 59 ITV3 +1, 64 Blaze, 67 TRUE CRIME, 68 TRUE CRIME XTRA, 78 TCC, 81 Blaze +1, 83 Together TV, 89 ITV4 +1, 91 WildEarth, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, 267 Al Jazeera English, plus 30 others

COM5
ArqA
 H -6dB
 V -6dB
C22+ (482.2MHz)
302mDTG-850,000W
50,000W
Channel icons
11 Sky Mix, 17 Really, 19 Dave, 31 E4 Extra, 36 Sky Arts, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 60 Drama +1, 65 That's TV 2, 70 Quest +1, 74 Yesterday +1, 75 That's 90s, 233 Sky News, plus 11 others

COM6
ArqB
 H -6dB
 V -6dB
C28 (530.0MHz)
302mDTG-850,000W
50,000W
Channel icons
12 Quest, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 52 GREAT! romance, 56 That's TV (UK), 61 GREAT! movies extra, 63 GREAT! romance mix, 71 That’s 60s, 73 HobbyMaker, 82 Talking Pictures TV, 84 PBS America, 235 Al Jazeera Eng, plus 18 others

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

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
Thursday, 21 February 2013
Dave
sentiment_satisfiedSilver

5:22 PM
Brighton

I live in Brighton but use Rowridge, I have lost Chs 25 and 28 for some weeks now. Are they are on reduced power I wonder ?

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Dave's 126 posts GB flag
Dave's: mapD's Freeview map terrainD's terrain plot wavesD's frequency data D's Freeview Detailed Coverage
Saturday, 23 February 2013
R
Roy Barton
4:37 PM
Wimborne

For the last 48 hours the signal strength and signal quality as registered by or TV has been pretty steady at strength 98% to 99%. tiny fluctuations of a 1% or 2% occurs extremely rarely. The pictre reception is perfect. So keeping my fingers crossed the problem that has seemed to get worse slowly over a couple of months may have cleared. Possbily somebody at Freeview may have sorted something out.
If the problem has cleared on a permanent basis I am faced with the embarrassing possibility that the problem occured at the connectors on the aerial splitter/amp situated right close to the TV.
If it was a connector fault then it was a very weird one as the signal fluctuated on a very random basis between perfcet and zero with much of the time giving readings between the extremes. All this without any physical disturbance of the cabling.
One possibility is that the connector had some minor corrosion. Copper oxide can act as a semiconductor and possibly the non-linear effect of this coupled to the non-linear performance of the TV signal meter (hinted at by Mazbar)may have interacted with minor variations in the signal strength resulting in extreme results.
Who knows perhaps the problem will return and make the speculation above in this eamil turn out to be rubbish.
However whatever the facts are the observations I have made (and reception dropping out) are very weird and defy understanding.
One positive thing from this is that given the help of the postings above I have gained some understanding of what digital TV transmission is all about.
I don't understand how a channel can transmit simultaneously both horizonatlly and vertically. Vector analysis would suggest that the result would be something like 45 degrees polarisation. (But what would I know? )

link to this comment
Roy Barton's 13 posts GB flag
Roy's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
J
jb38
sentiment_very_satisfiedPlatinum

5:31 PM

Roy Barton: With regards to you having doubts about the problem having possibly been caused by your own installation, which of course has not been proven as yet, but this is the type of situation where its sometimes advisable to make some local enquiries for purposes of determining if the problem is being experienced elsewhere, as its by far the quickest way to confirm (or otherwise) if your installation is at fault or not.

As far as Vertical as well as Horizontal transmissions are concerned, its just simply the case that the transmitter output (via a matching unit) is connected to the radiating elements used for the two polarities involved, this just the reverse situation of a viewer receiving from two stations that radiate of different polarities, both the aerials being combined in a diplexer and fed to the receiver via one coax.

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jb38's 7,179 posts GB flag
K
KMJ,Derby
sentiment_satisfiedGold

6:35 PM

Roy Barton: The mention of 45 degrees polarisation reminded me that some local radio FM transmitters used to use slant polarisation in order to offer reception on both horizontal and vertical aerials. This was before FM transmissions were standardised to have horizontal and vertical components, now refered to as mixed polarisation.

link to this comment
KMJ,Derby's 1,811 posts GB flag
Sunday, 24 February 2013
R
Roy Barton
9:33 AM
Wimborne

Interesting comment by JB38. In the hypothetical case where two signals were combined from two aerials through a (perfect) diplexer, the output signal power would be the two added together. This would be dependent upon the two signals being perfectly in phase. It is likely that they would be in phase in the case put forward.

The above is a non-practical arrangement to illustrate adding signals together in a cable. However adding electromagnetic signals together in space is somewhat different. In space it is possible to have phase differences and also polarisation differences. If we assume that there are no phase differences in signals from an H aerial and V aerial we are left with polarisation angle differences. This is where vector summing comes in. Two equal signals at 90 degrees add together should give a single signal at 45 degrees. Presumably the power in the resulting signal would be the sum of the two added together.

I dont think the above comments have anything to with my problem (hopefully now gone away because I wiggled the connectors a bit). However there is a chance that I have misunderstood the H & V polarisation issue and anybody reading this might put me right.

One thing about polarisation if we were talking about visible light, polarisation would effect reflections from surfaces. I expect polarisation of TV signals might effect differences in reflection off pylons, clouds etc.

As I finish this email I see that the signal strength/quality meter on the Sharp TV is still steady at 98%/99% and has been that for three days. Channel 28 now shows the same result as all the other transmission channels. (The screen presentation for signal quality on this TV is excellent but I do accept that it probably not very linear but it serves a purpose very well.)

Initially I was very confused. There are Transmission Channel numbers and Entertainment Channel numbers. (Not many people differentiate.)


link to this comment
Roy Barton's 13 posts GB flag
Roy's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
R
Roy Barton
11:33 AM
Wimborne

Thanks Briantist. That MIMO link explains all. I did not realise that the signals on H and V were different. I now understand, different signals on H and V keeps them separate. (Therefore effectively doubling the bandwidth.)

With the V & H co-frequency concept it is easy to see how you can can obtain 100% signal strength and 0% quality. (IE the two polarisations interfere perfectly with each other.)

I can see the problem, if the receiving aerial is not perfectly H or V then there is potential for the different signals operating on the same wavelength to interfere. Worse still any reflectors such as pylons might change the polarisation (?) and that would result in cross channel interference.

I am surprised that mixing H & V on the same transmitter works as well as it does on the fringes.

I wonder if the H & V divide explains why my BBC HD channel changed from 51 to 101 when I retuned? Before and after I got perfect signal quality and pictures on BBC HD (and all the other entertainment channels other than those on transmission channel 28) Is BBC HD on channel 51 in H and 101 in V ???

The subject gets clearer every post. (But there is still lots to mystify.

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Roy Barton's 13 posts GB flag
Roy's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
R
Roy Barton
11:40 AM
Wimborne

Given what I wrote above, I can see it would not be a good idea to use a diplexer to combine signals from an H aerial with that from a V aerial. A switch would be the thing to use. (Nobody ever suggested that this would be a good thing to do.)

The more I think about it it seems that my H aerial may also pick up V signals as well. If that is the case I wonder what has happenned in the last few days to stop this happening. Perhaps the H and V signals have been made identical???
I could get paranoid over this !!!

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Roy Barton's 13 posts GB flag
Roy's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
J
jamie
sentiment_satisfiedSilver

5:54 PM
Portsmouth

ROY BARTON-

There is no reason to combine a HP and VP signal, although they are received differently they are outputting reception on exactly the same UHF settings.

Thus all you will be actually doing is combining 2 identical signals.




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jamie's 207 posts GB flag
jamie's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
J
jb38
sentiment_very_satisfiedPlatinum

7:51 PM

Roy Barton: With regards to the latter part of my reply and where I gave an example of a reverse situation to transmission involving the reception of H & V polarised signals from two aerials being combined in a diplexer and with reference to this in relation to the first paragraph of your latest posting, I did actually say >> a viewer receiving from "two" stations radiating on different polarities << and not two aerials of differing polarities being diplexed when receiving from the same bi-polarity station, something which I feel would be a pointless exercise anyway.

It has to be appreciated that when dealing with RF signals in any frequency band under that of microwave that "nothing" is exact once the signals have travelled via airspace, and so have to be looked at in a somewhat different way to that as though they were still contained "within" a transmitter station and being carried via trunking or cabling, as once an RF signal has left the mast this is where theory and practice generally starts to part company and elements of educated guesswork is the order of the day in attempting to solve any reception problem, but of course based on knowledge of the range of variables that is likely to apply, as the problem with remote diagnosing of reception difficulties is that the only way of assessing the situation is by feedback supplied by the viewer and so the more info supplied the better!

That said though, nothing can really beat an on site visit armed with a quality signal meter and a test aerial of the medium sized log periodic type so that the levels indicated are not being biased by the characteristics of the aerial, as well as it being beneficial for other bits and pieces to be at hand to either boost or reduce the signal level dependant on the location in relation to that of the transmitter, as a number of physical checks can be carried out on an installation in the first stages of an on site visit that cannot really be done without exceptionally lengthy two way "questions and answers" postings being involved.


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