C26 (514.0MHz) after switchover
The map below shows all the transmitters in the UK using C26 once digtial switchover is complete. Please click the icon to see the coverage area, and double click for more information.
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What do the map symbols mean?
tx_LNG, COM5/ArqivaA multiplex, COM5/ArqivaA multiplex, PSB1/BBCA multiplex, PSB1/BBCA multiplex, PSB2/Digital 3+4 multiplex, PSB2/Digital 3+4 multiplex, PSB3/BBCB/Freeview HD multiplex, PSB3/BBCB/Freeview HD multiplex, Saorview multiplex 1, Saorview multiplex 2, Saorview multiplex 2.Before switchover
Click on a selection to see the use of the frequency use before switchover:C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68
Switchover complete
Click on a selection to see the use of the frequency use when switchover is complete:C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 * * * * * *
Thursday, 28 April 2011
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John Tidy12:05 PM
I live on the far side of Blackheath from the CP tx and had perfect reception until last Sept when suddenly I couldn't receive a watchable signal on any of the channels on Mux1 (DTV Ch25) i.e. BBC One (London), BBC Two (England), BBC Three, CBBC & BBC News. After a lot of web-searching, inc looking into freesat, fiddling with the aerial (height is critical) and putting up with it eventually the quality returned to normal.
As of a week ago we are back to having exactly the same really poor reception - same channels, same Mux and same symptoms , i.e. can have either this Mux alone with just acceptable quality, or everything else with good stable pictures and sound. but not both.
I found a spare aerial (they are both Wolsey ColourKings) so now there are two on my 20ft pole, but even that's not great nor acceptable in the long-term.
Before you tell me to change the aerial, remember it performed perfectly for many years before this all started about six months ago.
Please help! All and any suggestions welcome.
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Mike Dimmick3:30 PM
John Tidy: The problem is that grid aerials don't have very much gain, and have a fairly wide acceptance angle. At that distance from Crystal Palace, you don't need the gain, but you're still at risk of picking up co-channel interference from other transmitters, as well as increased likelihood of too much signal overall.
I would consider getting a small log-periodic aerial, which have better directional properties. You might need to add an attenuator to reduce overall signal levels.
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It could simply be due to weather conditions, of course: there are many other transmitters in the country using the same channels, which are normally blocked by terrain but in the right weather conditions, the signals bounce off the atmosphere and cause interference at far-distant locations.
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Wednesday, 11 April 2012
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laura8:33 PM
i re-tuned my freeview box like told too and lost all the bbc channels? will i get them back? thanks (i live in surrey- just by gatwick).
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Mike Dimmick9:46 PM
laura: Check whether your box supports 8K mode. There's a list of some equipment that is known not to at http://www.digitaluk.co.u…ment . If it doesn't support 8K mode you'll lose all the remaining channels when switchover completes next Wednesday.
There are still some boxes around that have problems with the larger Network Information Table. This problem shows up when you retune, although you'd have had to not retune for more than two years now. Again, a partial list is at http://www.digitaluk.co.u…tnit .
Do make sure you do a full retune - also called factory reset, first-time installation, virgin mode or default setting. Some boxes even seem to need to have this done with the aerial unplugged to ensure they're completely cleared out before doing it again with the aerial connected. For information on your particular box, see TV Re-tune productmanuals .
If that doesn't explain it, you could have too much signal. If you're sharing a communal aerial, get the landlord or management agent to adjust the levels. If not, try unplugging any amplifiers or boosters that you have. If you don't, you might need to add an attenuator to reduce the levels.
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Friday, 4 May 2012
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Andrew Healy2:56 PM
Ashford
Sirs,
is the D3+4 multiplex, at Crystal Palace, unmdergoing something mechanical ? The signal from this multiplex fails repeatedly and fouls my Alba TV, when I can reach it. Is this multiplex set too high or low ?
I have had this problem since full switchover (DSO).
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Andrew's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
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Mark Fletcher4:30 PM
Halifax
Andrew Healy,Ashford.Too much signal is most likely the cause,either that or single frequency interference at your location in receiving the D3+4 multiplex from Crystal Palace transmitter.Try a set top aerial or a piece of wire or coat hanger,then ascertain the result whether the D3+4 multiplex is playing games or settled as such !
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Mark's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
Saturday, 5 May 2012
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Andrew Healy11:07 AM
Ashford
Mr Fletcher,
when my picture fails, I am using a loft aerial and the signal strength goes so near to zero that my screen pixellates. BBC and Radio transmissions are fine, but, everything from D3+4 is shot. And no, a fully external aerial is not an option- I lodge.
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Andrew's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
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Mark Fletcher2:29 PM
Halifax
Andrew Healy,Ashford.Single frequency interference is the cause !
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Mark's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
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Andrew Healy4:09 PM
Ashford
Have found out that a nearby bloke is a radio ham. This is a known source of interference, so have ordered a DTI (digital TV interference) filter, from Amazon- this should remove all ham and possibly taxi radio signals. Many thanks for your help, Mark.
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Andrew's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
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Mark Fletcher11:44 PM
Halifax
Andrew Healy,Ashford.No problem whatsoever,pleasure to have been of assistance to you !
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Mark's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
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