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Missing Freeview Chanels
4 Answers
has anyone receiving from emley moor tv transmitter lost some freeview channels ie: 41 legend 237 talk tv 64 blaze they are neither on tv or Humax yes i have retuned but both now showing on those three alone no channel on this number ?
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According to the Freeview website, there are no scheduled engineering works at the Emley Moor transmitter. Neither are there are any emergency works, according to UKFree.tv (which is usually a reliable source of information). That strongly suggests that the problem is 'at your end'.
Freeview channels are transmitted in 'bundles', called multiplexes, with each multiplex being on a different frequency. All of your missing channels are bundled into the 'COM 4' multiplex, meaning that they're all using the same frequency. I strongly suspect that your aerial isn't up to the job of receiving that particular frequency when reception conditions are poor (as they're likely to be at the moment, due to a high solar flux index).
In an ideal world, you'd have a different aerial on your roof for each different multiplex, meaning that you'd need to have seven aerials up there (because the signals from Emley Moor are bundled into 7 multiplexes). That's clearly not practical, so we all use aerials that (by the laws of physics) will 'resonate' better on some frequencies than on others. Your aerial isn't much good at receiving signals on 570 MHz (which is the lowest of the seven frequencies in use and is the one used by COM 4). It can 'pull in' signals on that frequency when conditions are good but when, say, there's a lot of solar activity (as there is now), it simply can't cope.
When the switchover from analogue TV to digital TV was due to happen, it was predicted that around of third of homes would need a new TV aerial (because digital TV uses different frequencies to analogue TV). It turned out that far fewer homes actually did but it's still not very surprising when people find certain channels (almost always on a common multiplex) dropping out.
The good news though is that you probably don't need to fork out a lot of money to get a new aerial fitted. As you're getting adequate signals most of the time, simply installing one of these should solve the problem for you:
https:/
(You'll need one of these to go with it https:/
Freeview channels are transmitted in 'bundles', called multiplexes, with each multiplex being on a different frequency. All of your missing channels are bundled into the 'COM 4' multiplex, meaning that they're all using the same frequency. I strongly suspect that your aerial isn't up to the job of receiving that particular frequency when reception conditions are poor (as they're likely to be at the moment, due to a high solar flux index).
In an ideal world, you'd have a different aerial on your roof for each different multiplex, meaning that you'd need to have seven aerials up there (because the signals from Emley Moor are bundled into 7 multiplexes). That's clearly not practical, so we all use aerials that (by the laws of physics) will 'resonate' better on some frequencies than on others. Your aerial isn't much good at receiving signals on 570 MHz (which is the lowest of the seven frequencies in use and is the one used by COM 4). It can 'pull in' signals on that frequency when conditions are good but when, say, there's a lot of solar activity (as there is now), it simply can't cope.
When the switchover from analogue TV to digital TV was due to happen, it was predicted that around of third of homes would need a new TV aerial (because digital TV uses different frequencies to analogue TV). It turned out that far fewer homes actually did but it's still not very surprising when people find certain channels (almost always on a common multiplex) dropping out.
The good news though is that you probably don't need to fork out a lot of money to get a new aerial fitted. As you're getting adequate signals most of the time, simply installing one of these should solve the problem for you:
https:/
(You'll need one of these to go with it https:/
Channels 236 and 235 are both bundled into the COM 6 multiplex, right at the other end of the frequency spectrum from COM 4. Your communal aerial is good at receiving signals at higher frequencies (such as the 690 MHz that COM 6 uses) but poor at receiving them on lower ones (such as 570 MHz that's used by COM 4). A signal booster might still solve your problem.
(Solar activity follows an 11-year cycle and is currently on the rise. As it gets higher, don't be surprised if you lose some of the other COM 4 channels, such as 16, 21, 22, 29, 32, 33, 41, 42, 46, 58, 59, 64, 67, 74, 78, 81, 89, 203, 208, 209, 210, 211, 237, 263 & 269. Communal aerials aren't immune to the effects of solar radiation!)
(Solar activity follows an 11-year cycle and is currently on the rise. As it gets higher, don't be surprised if you lose some of the other COM 4 channels, such as 16, 21, 22, 29, 32, 33, 41, 42, 46, 58, 59, 64, 67, 74, 78, 81, 89, 203, 208, 209, 210, 211, 237, 263 & 269. Communal aerials aren't immune to the effects of solar radiation!)
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