All posts by Nick
Below are all of Nick's postings, with the most recent are at the bottom of the page.
Thanks Brian. This permanent herringbone on ch 51 remains a mystery then.
You have opened another can of worms with your reply to Chris Jenkins saying amps can cause interference on digital. At my friend's house in Aldeburgh they use an amp for Sudbury and hope to continue to use it and Sudbury, rather than Aldeburgh with its few channels after switchover. Can you briefly outline any symptoms to look for if we get problems, so we can work out if they may be due to the amp? Many thanks.
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thanks Brian. If the signal quality does not drop, but then we get these problems, it just means signal is not good enough?
I am experimenting with a digibox on the few channels I can sometimes get, with booster. There are ghostly vertical lines about 3 ins apart moving fairly rapidly across the screen, left to right. Any ideas please? Sig strength almost nil.
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Dear Brian,
Whether before or after switchover, is there any reason why , if you can receive one channel within a certain mux group, you should not receive all channels in that same group? I have a feeling that when I can get anything at all, I am getting the odd channel from various groups, rather than all the available channels within whatever mux I am on at the time. Many thanks.
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Thanks Brian. Hope you also saw previous message about ghostly image on freeview.
We are getting most peculiar interference on channel 51 analogue at present. This time a constant ghostly rectangle, from top to bottom of screen, 6 inches wide, 3 inches in from the left hand side of the screen. We used to get something like that sometimes from French secam analogue. What it is to be on the east coast!
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I notice one of the multiplexes transmits on channel 50+. I do not know what it means by '+', but am wondering if it could remotely be causing these problems. Presumably it means it is very close to 51?
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thanks Brian, but i only have the one scart, freeview to tv whilst testing. Very curious.
I have a group B high gain aerial. Would there be any benefit in substituting a wideband for out of group channels? I ask because wideband aerials must be poor at extreme ends of ch21 and 68, and what I have is already 'in the middle.' Thanks.
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Dear Brian,
Group b covers ch 35-53, ie all the analogue channels used by Sudbury. I do not understand how a wideband areial would improve things as it must surely be a compromise to try to include channels as far apart as 21 and 69. I have seen graphs of the performance of wideband aerials which show a tailing off of gain at either end. Surely that is exactly what my group b aerial does too?.
I am still playing with the digibox which I have set to install. When the wind is in the right direction, I get channels from ALL the mux shown for Sudbury, but not all the channels within every mux. This really puzzles me. Notable absentees are ITV 1, c4 and C5. Whoever decided we should have QVC and Babestation instead!
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Thanks Brian,
looks like I gave you duff info, receiving nothing on ch 68, despite its higher power.
Will have to wait till upgrade to see if we get it before changing aerial. I assume that it will still be 68 for these channels after upgrade? I don't know why they had to put them out of group in the first place, esp as they are far more important than QVC etc.
Kind regards.
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Tuesday 17 May 2011 11:06PM
Woodbridge
Many thanks. A friend who used to work in the industry tells me he understands the herringbone to be caused by the digital channels from Sudbury itself, even though not on the same channel 51. What do you think of that one? I think it fair to say the herringbone is there all the time and therefore possibly not caused by atmospheric conditions.