All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
Lesley: Whilst it must be said that any prediction is merely a guide as there are factors that aren't taken into account such as obstructions, it appears that reception from Crystal Palace may be possible.
On account of the fact that you appear reside in a tall block of flats, one must wonder as to why your aerial wasn't directed to Crystal Palace in the first place. This is because the higher up you go, the more you can see over buildings (and any terrain that might otherwise be in the way), and hence the better it is to "see" the transmitter. Indeed, the Crystal Palace transmitter may even be able to seen from the roof, which is presumably where the aerial is located which gives the greatest odds of likelihood of reception.
Presumably you will have to speak to your landlord , or whoever is responsible for the aerial system.
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Lesley: I take back what I said before having looked at the path between your block and the transmitter. It would appear that the high-rise buildings on Canary Wharf could be the reason that your aerial wasn't directed to Crystal Palace.
Therefore, I'm not sure whether you might get reliable reception from Crystal Palace. Digital signals aren't so adversely affected by reflections (as analogues were) which are likely to be an issue in an area where there are tall buildings near to a high power transmitter, as in your location.
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PaulD: PSB3 is the HD one and if you try a manual tune for it, it is UHF channel 21. If there is a setting on the manual tune screen for the mode, ensure that it is set to DVB-T2 rather than DVB-T, the latter being that of Freeview standard definition broadcasts.
Rowridge is unique as a main station because it has used mixed polarisation since switchover. In the days of analogue it was horizontally polarised, like all other main stations. However, following switchover all six channels are on the same power of 200kW vertically whereas the COMs are restricted to 50kW horizontally (with PSBs being 200kW horizontally). The horizontal component is more for backward compatibility with existing aerials.
There is generally no requirement for Rowridge aerials to be replaced as all digital channels are Group A; only switch to vertical polarisation.
In some cases, such as with Sandy Heath, some or all COM channels are outside of the group (which is a part [third] of the frequency band) used for former analogue and hence outside of that which installed aerials work best.
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Steven Wilson : You will need to use the analogue tuners within the TVs, if they have one. If not, then you won't get it to work as it did before.
Knowledge of the model number(s) would allow checking of specification(s) to see if they have analogue tuners in.
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Lesley: If you are using a comunal (shared) aerial system and it is at fault, then you need to speak to whoever maintains it (e.g. your landlord). It might be worth asking neighbours if they are having the same issue.
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Lesley: I would add that if you speak to neighbours, ensure that you ask about Freeview as, if there are connections for satellite TV (Sky/Freesat) some may be using them exclusively.
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brian: Freedom of Information requests have limits on their costs.
Therefore, with that in mind, if someone requested the radiation patterns for "all" 1,000+ transmitters, then there would, presumably, have to be some idea of expected cost. Perhaps it was calculated that the cost of considering release of the radiation pattern of each transmitter individually would exceed the cost limit. Therefore, maybe they were done in geographical blocks or grouped in some other way.
Hence considering whether radiation patterns for BBC South transmitters, for example, should be released, the answer came back as "no they shouldn't" because it was considered that at least one should be withheld.
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Sarah: See:
How can I get Channel 5 on Sky in Ireland? | ukfree.tv - 10 years of independent, free digital TV advice
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Monday 7 January 2013 6:38PM
David Cook: The example is to bring up the signal strength screen on BBC One.