All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
steve M: Indeed, a four services (out of the six) of Blue Bell and Tunbridge Wells are co-channel until switchover!
- C59 BB Mux 1 / TW Mux D (both no offset)
- C42 BB Mux C (neg offset) / TW Mux A (pos offset)
- C39 BB Mux C (pos offset) / TW Mux C (no offset)
- C45 BB Mux B (neg offset) / TW Mux B (pos offset).
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Nick: The "others" are links and if you click on them it tells you what they are.
Unplug your aerial whilst it is scanning Aldeburgh channels. Scanning is from 21 to 69. If it gives only a percentage, you can work out what percentage to plug in at. 25% should do the trick.
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Nick: Looking at the list of BBC National multiplex transmitters, your nearest would appear to be Aldeburgh (1.8kW), Manningtree (5kW), Mendlesham (4.3kW).
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Nick: The list of BBC national DAB transmitters is here:
BBC - Help receiving TV and radio - Transmitters
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Briantist: C42 and C45 are showing with the green bar Group C/D bar when they are not.
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Idris: It is not good practice to combine two aerials using a splitter in reverse without filtering.
A diplexer combines two aerials into one downlead. Each of the two inputs are filtered to only allow certain channels through. Some examples are here:
A.T.V (Aerials And Television) TV Aerial, DAB Aerial, FM Aerial. onlinesplittersandamps.html#TVTVdiplexers">Online TV Splitters, Amps & Diplexers sales
The only thing I would say here is that if you go with the "Channels 21* to 35 combined with 37 to 68 (i.e. split at CH36)", then you won't be able to receive (without altering your aerial system) the future multiplex that is expected to be broadcast on Ch36. For that reason I would probably go with "Channels 21* to 37 combined with 39 to 68". This does mean, of course, that you will have to receive the future multiplex on C36 and the two others expected to broadcast on 31 to 35 from Rowridge.
There may be other solutions using filters and a splitter in reverse.
See ATV Sheffield's site for more information:
A.T.V (Aerials And Television) TV Aerial, DAB Aerial, FM Aerial.
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MH: I'm not surprised that Mux 2 and Mux A are the two you don't have as they are co-channel with Sandy Heath whereas others are not. Sandy Heath switched a year ago and has been using these channels since then.
I suggest that you try tuning to Sudbury/Rouncefall as they have switched to full power. It's a try it and see sort of thing; I wouldn't go altering the aerial but if it provides a more stable reception than now, then it might be better until June when Blue Bell switches.
Rouncefall and Sudbury work as a Single Frequency Network for the Public Service channels. That is they are on the same frequency (this works!). Rouncefall was introduced at switchover and only broadcasts the Public Service channels. The Commercial channels are on low power from Sudbury, so you will probably have to stick with Blue Bell for these.
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David Precious: The only thing I can think is to ensure that only signals from Midhurst are stored and that it doesn't store signals from other transmitters (if that is what it does).
I'm skeptical as to whether will cure the problem, but under the circumstances it would seem that only thing to do. Some systems' EPGs don't work well with signals from multiple transmitters.
If it has entries in the 800s, then this means that it has picked up signals from more than one transmitter. It puts duplicates (e.g. a second BBC One) in the 800s.
Some ideas for achieving the object of Midhurst only channels being stored:
Midhurst uses UHF channels 50 to 62 (frequencies). The automatic tuning scan runs 21 through to 69.
If you keep the aerial unplugged until about C48 (or 55%), then you should miss out any transmitters that use channels lower than this.
If there are transmitters that are interleaved within Midhurst's channels, then having completed this procedure you will still expect to have them in your 800s.
Examination of those channels and in particular what UHF channel(s) they are on by looking at the signal strength screen should allow you to work out which transmitter it is and therefore which channels you need to avoid.
The services are broadcast on multiplexes. Each multiplex carries a basket of services. For example, BBC One, BBC Two, BBC News and others are all carried on the same multiplex or signal.
For a list of services before and after switchover, see DTG :: DTT Services by Multiplex
The Digital UK - Postcode checker will also give you an idea of what you're likely to receive, although not all will pose a problem for you. Tick the box to say that you're in the trade and it will give you transmitters and channel numbers.
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Monday 26 March 2012 3:49PM
steve M: Be aware that reception of C24 from Blue Bell which is Mux 2 (ITV1, Channel 4 etc) may have changed due to changes with other stations that use that channel.
On 7th March, the power of C24 from Reigate was increase due to Rowridge switching to digital. Rowridge uses C24 for its full power digital service and formerly for one of the analogue services.
Is reception not possible from Tunbridge Wells transmitter?
I put TN9 1SU into the predictor, and it suggests that reception will be excellent, even now, before switchover with the lower power signals:
Postcode Checker - Trade View (TN9 1SU)