All posts by Michael Perry
Below are all of Michael Perry's postings, with the most recent are at the bottom of the page.
Janet Shephard:
Retuning never resolves interference, it only looses you some channels in that situation. Somplease do not keep retuning.
Please also provide a full post code so that we can determine the expected reception coditions at your location. There are over 1100 transmitters broadcasting Freeview and we need to identify which you are likely to be using.
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L Tolley:
Please provide a full post code so that we can look at the predicted reception at your specific location. There are over 1100 Freeview transmitters and we have no indication which you might be using.
Meanwhile, please check all your aerial cables and connections. If there are any coaxial plugs/sockets then unplug those and refit to remove any possible corrosion/oxidation from the contacts.
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Rupert:
The clearance of the 700 MHz band requires a large number of changes to the transmission scheme so that all the required transmissions could be fitted into the frequency spectrum remaining after the move out of the 700 MHz band. That all takes time so Arqiva started several months ago moving some channels to accommodate the reduction in spectrum available after 5G starts. To do that it was necessary to separate out some services into what are called Single Frequency Networks and that is why almost all of the COM7 and COM8 services are on channels 55 and 56 for now. Only 30 of the main transmitters carry those signals.
When it is deemed that most viewers have equipment that is capable of receiving and displaying the DVB-T2 transmission needed for HD services then there will be further work by Arqiva to bring the programme services that are currently on COM7 and COM8 onto the multiplexes that are below 700 MHz. That cannot be done as yet because too many viewers are unable to receive and display HD programmes due to limitations of their equipment (it is necessary to use equipment that is defined as Freeview HD and not 'HD ready' as that only means the screen can show HD but there is no HD decoder built in!). The DVB-T2 encoding is capable of carrying more data, so can be used to broadcast more channels within a multiplex than is possible with the current DVB-T encoding used for the SD multiplexes at present. That will mean fewer multiplexes will be needed and hence COM7 and COM8 will become redundant, so can be switched off to free up the 700 MHz band. So people can expect more changes over the coming three years or so and that's why most are recommending viewers use a wideband aerial that will be able to receive all the current and future transmissions. That aerial could be a conventional type based on the Yagi design of a log-periodic type, both types cover the whole of the allocated UHF frequency spectrum. That means there will not be any need to change the aerial in future.
Hope that clarifies a rather complex subject?
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Simon:
They have not gone anywhere, they are stuill being transmitted as normal. If they had disappeared then thousands of viewers would be complaining but they are not. So it looks as if your system has a problem.
Please provide a full post code so that we can look at the signal reception conditions at your location, it has to be a full post code as aprtial will not enable us to check the reception preditions.
Meanwhile, please check all your aerial system, checking the cabkles and any connections. If there are coaxial plugs/sockets unplug those and refit to clear any possible corrosion/oxidation on the contacts.
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Simon Wells:
This is not the website for Now 80's so no one there will see your comments on this website. Please use their own website.
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Sheila Peake:
Where are you located (please provide a full postcode)? Does your TV receive the HD channels on 101-105? PBS America is carried on an HD transmission channel so your equipment needs to be able to receive such and then display them. You also need to be in an area where those signbals are available as not all transmitters broadcast them.
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Chris Roberts:
You should find it on programme 19. It is carried on the ARQB multiplex which is brodcast on channel 46 (671.25 MHz).
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Tony:
Excessive signal is unlikely to cause internal damage to your Freeview equipment unless it is at a signal level of several volts! It is usually a few millivolts. However, excessive signal will overload the tuner so it cannot work properly and will give either no reception al all of else all the pictures will break up (pixilation). You ideally need a signal strength shown on your TV of between 60% and 85%,
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Mardler:
One source of transmitter information to use is the |Digital UK website. This website is not responsible for providing that information.
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Friday 9 November 2018 11:46AM
Graham Pert:
Channel 4 HD was withdrawn from Freesat a while ago.