Full Freeview on the Rowridge (Isle Of Wight, England) transmitter
 | Google Streetview |  | Google map |  | Bing map |  | Google Earth |  | 50.676,-1.369 or 50°40'35"N 1°22'7"W |  | PO30 4HT |
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._______
Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.
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 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.
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?
BBC South Today 1.3m homes 4.9%
from Southampton SO14 7PU, 26km north (354°)
to BBC South region - 39 masts.
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 Docks | Transposer | 2 km N city centre | 50 homes Estimate. Group of houses' |
How will the Rowridge (Isle Of Wight, England) transmission frequencies change over time?
| 1950s-80s | 1984-97 | 1997-98 | 1998-2012 | 2012-13 | 2 May 2018 | ||||
| VHF | A K T | A K T | A K T | A K T | W T | ||||
| C3 | BBCtvwaves | ||||||||
| C21 | C4waves | C4waves | C4waves | +BBCB | BBCB | ||||
| C22 | +ArqA | ArqA | |||||||
| C24 | BBC2waves | BBC2waves | BBC2waves | BBCA | BBCA | ||||
| C25 | SDN | SDN | |||||||
| C27 | ITVwaves | ITVwaves | ITVwaves | D3+4 | D3+4 | ||||
| C28 | ArqB | ArqB | |||||||
| C29 | LSO | ||||||||
| C31 | BBC1waves | BBC1waves | BBC1waves | com7 | |||||
| C37 | com8 | ||||||||
| C55tv_off | com7tv_off | ||||||||
| C56tv_off | COM8tv_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 |
Local transmitter maps
Rowridge Freeview Rowridge DAB Rowridge TV region BBC South Meridian (South Coast micro region)Which companies have run the Channel 3 services in the Rowridge transmitter area
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Tuesday, 19 February 2013
Roy Barton: As you say, the tri-boom aerial is based on the yagi principle: there is a dipole, which is the active part (the bit that the cable connects onto), and elements whose purpose is to focus the signal onto the dipole. The elements are connected electrically to the cable.
With a yagi there are a number of factors which result in it being a compromise to make it more sensitive across the whole band at the expense of a level gain curve.
With a log periodic there is a double-boom. The cable connects across the two booms at the transmitter-facing end and the boom are connected together at the mast end. Each element acts to receive at a particular frequency.
I wouldn't bother with the tri-boom wideband. Don't buy a crappy contract aerial either. If you get a log then wideband is fine because their gain curves are much flatter than yagis.
There are plenty of aerial suppliers online selling the aerials that the professionals fit. No longer do you have to rely on what the DIY shops sell.
If you were using an aerial horizontally, have you tried turning it vertical?
Just going back to your original posting, have you checked the cable for signs of damage and water ingress? This could perhaps be chafing on guttering on guttering or a roof tile.
I'm not a professional, but at 28 miles, and just out of line-of-sight approximately 1 mile away, I think that the signal strength will be quite good.
If you're in a good signal area then a log will be fine. If (and I say this as your "Plan B" incase Plan A doesn't work) it doesn't have enough gain then you can use the amplifier.
I came across this shop which sells a range of logs for less than £20 including delivery:
Aerials [Aerial Type: Uhf Log-periodic] > AerialSat.com
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ROY BARTON -
Hi, I am a professional installer who is a digital approved member.
With regards to the log periodic they have flat gain so perform pretty much like a group A aerial. Not one that I would fit, however I have seen them performing well.
Something which people seem to not advise on this site is one simple thing, your signal received can change from location to location, so I would try testing the aerial on different parts of the building, simply moving the aerial a few feet can make all the difference when receiving signal, location is key to making it all work properly.
hope this helps :)
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jamie's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
D
Doug Cheney4:45 PM
Wimborne
ROY BARTON
I live in BH21 1BD and don't have line of sight to Rowridge transmitter, my installer fitted a log periodic in the vertical position with a masthead amp and I get very good reception
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Doug's: mapD's Freeview map terrainD's terrain plot wavesD's frequency data D's Freeview Detailed Coverage
J
jb385:27 PM
Doug Cheney: An excellent combination that performs well under a whole range of conditions, and unlike the so called high gain types is generally capable of providing a much less glitch prone signal when used in circumstances that could be described as being less than ideal for reception.
The problem a log aerial does have though is "image", as most make the mistake of equating a large structure on their roof as being somewhat superior.
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R
Roy Barton5:48 PM
Wimborne
Roy Barton:
I nearly fell out of my chair when the distributor said their Group A aerial was only £6.99 plus VAT. I think it was trade price. He said all the installers use them. I am now confused what a log periodic is. I thought log periodic was the simple aerial with a single boom. (I thought that all aerials were Yagis... but what do I know?) There is so much complexity. I have left the TV on all day displaying signal strength and signal quality. All day long while sun was shining the signal strength was around 99 and the signal quality was fluctuating between 40 and 70. When the sun went down the signal strength dropped to 90 and the signal quality fell to the lowest reading of just 1 (that is the same as 0) but occasionally the signal quality bounces up to 10 or 14 for a minute or so before returning to 0.
This is all very curious. I really intend to experiment with V polarisation using the tri boom and the cheapy just out of interest. Unfortunately I won't be messing with the aerial on the roof as that is inaccessible without cherry pickers or similar. (Or a very light footed installer with good equipment.)
I suspect that the G4 being introduced to Southampton my be the culprit?
My signal has to pass through the pylons of thw national grid half a mile away and some large conifers... but these were never a problem.
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Roy's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
ROY BARTON=
If you use a group A aerial and avoid using an amplifier you should not have issues with 4G
:)
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jamie's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
Roy Barton: Yagis and logs work on different principles.
See:
Aerials, TV Aerial and Digital Aerial
The yagi focuses the signal onto the "active" element (the dipole).
With a log, each element acts to receive at a different frequency.
Google log periodic antenna. There are two booms and they are parallel and perhaps a centimeter apart.
Log-periodic antenna - Wikipedia, the free encyclopedia
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J
jb389:25 PM
Roy Barton: With regards to the test you have carried out, although I do not wish to appear as a prophet of doom but I can tell you if the quality of the signal regularly takes a dive in the evenings then this is NOT the type of problem that's easily rectified as it indicates that the signal received is dependant on a level of atmospheric reflection.
That said, its absolutely essential that you alter the polarity of your aerial as a proper assessment of the situation cannot be made unless this is carried out, because the atmospheric induced aspect might not be so evident if the aerial is orientated to suit the higher powered signal from Rowridge.
By the way, the bursts of quality that you get now and again is caused by the main beam of the signal being reflected off some distant moving object that happens to be passing at precisely the correct angle, such as a high flying plane or a large aluminium sided vehicle like a furniture removal van or similar, its something that happens all of the time but mainly goes unnoticed.
If altering the polarity of the aerial results in a better level of reception then I would take the advice given in Jamie's 4.13pm posting concerning the aerial being tried in different positions to the left and right of where presently installed, as this is a something I "always" advocate myself as in many cases its far more effective than increasing the height which in many cases can actually make things worse.
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Wednesday, 20 February 2013
R
Roy Barton2:49 PM
Wimborne
Roy Barton:
I appreciate all the comments. For me the matter is a case of technical curiosity. For a couple of days now I have left the TV on monitoring signal strength and signsal quality. The problem only became evident a few months back and has gotten signifcantly worse over the last few weeks. Yesterday the signal quality was consistently good fluctuating a little around 40% to 60% for six hours or so. Then later in the day the signal dipped to zero returning hours later for periods of a an hour or so to 20% to 30%. (20% is the threshold for getting a good picture.) All this time signaal strength was 90% to 99% as opposed to signal quality.
This morning the signal strength started out at 90% but quality around 10% and soon the signal strength and signal quality both dipped to 0% and has stayed like this for four hours or so.
I have been checking the above results with a second TV and that gives good agreement.
I am not an expert but the above seems to be weather or atmosphere related. None of the observations were made in windy or rainy conditions.
We live in forest well away from traffic. There is not much in the way of buildings. There are the pylon wires between us and Rowridge.
As far as I know the neighbours do not seem to be having problems.
Later today I will start experimenting with different aerial arrangements.
I don't want to be a pain... My later posts are mainly driven by technical curiosity on this wonderful forum. I have a satelite dish installed which I have not used for years and if all else fails I will upgrade that with new kit that I have packed away.
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Roy's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
Roy Barton: As I say, I'm not a professional, but perhaps it might be worth checking that there isn't water/damp getting in.
The other possibility is that some vegetation has grown and is affecting your signal. Jamie's suggestion of looking at moving the aerial might be worth a try if that is what it is.
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