All posts by Briantist
Below are all of Briantist's postings, with the most recent are at the bottom of the page.
Nikki: Please see Freeview reception has changed? | ukfree.tv - independent free digital TV advice .
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Iain Nicol: Please see Digital Region Overlap | ukfree.tv - independent free digital TV advice and Freeview intermittent interference | ukfree.tv - independent free digital TV advice . You may need to do this - My Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+1, has no sound or the channel line up is wrong | ukfree.tv - independent free digital TV advice .
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Kevin: Please can you see Freeview reception has changed? | ukfree.tv - independent free digital TV advice .
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Stephen Who: OK, here's the answers
"If a Freeview box struggles to receive standard definition, will HD be more difficult to receive?"
No, at the same power levels 64QAM/8k/DVB-T has the same coverage as 256QAM/DVB-T2.
"Since each 1s burst of interference would destroy more data in HD, I imagine it could well be more difficult to get HD in areas of marginal coverage. "
I suspect you need to know about how COFDM works - there are many carriers (thus "8k") and each is protected by being broadcast with a "guard interval" and forms of error protection. This protects against interferece in a highly non-linear way. See How digital television works | ukfree.tv - independent free digital TV advice -
"Or is this offset by utilising more sensitive receivers, or a more robust error-correcting protocol? "
It's the latter.
"If there's a glitch on HDTV reception, do any boxes fallback to Standard-definition? "
No, the SD broadcasts are carried on a different multiplex and are not synchronised and are generally different services (BBC One HD is national, not regional, BBC HD has no SD version, ITV1 HD has fewer regions, C4 HD has no ad regions).
"And if you want to record a programme, is there any standard for how long a recording should continue in the absence of a signal?
If I try to record for 24h and my aerial falls down for 2s or 2 minutes or 2 h,
will I lose:
(a) the programme recorded until then
(ie temporary file not saved)
(b) the program recorded. "
The receiver will attempt to record as many bits from the scheduled start time to the schedued end time.
"And do any boxes allow 24h recordings
(as did old VHS tapes with timers,
subject to capacity).
As opposed to recording a programme on the EPG, which is subject to change, particularly on news channels, and might lead to gaps in coverage."
All modern receivers actually wait for a programme to start and end as the EPG is updated dynamically as the content is tagged in the live broadcasts.
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Pete Rostron: Start the laptop with the VGA cable disconnected and it should boot to your cracked screen.
Once you have logged in, press Windows+P and select "Projector Only" and the screen should transfer to the TV.
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Kevin Mitchelson: You should try My Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+1, has no sound or the channel line up is wrong | ukfree.tv - independent free digital TV advice .
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chez: You should have no problems with Multiplex ArqB at your location - can you please see Single frequency interference | ukfree.tv - independent free digital TV advice .
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joyce hadley: First try My Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+1, has no sound or the channel line up is wrong | ukfree.tv - independent free digital TV advice and if you still have problems see Single frequency interference | ukfree.tv - independent free digital TV advice .
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Kevin Regan: You are in a very strong signal area, you may have a signal overload.
If you have a booster or amplifier, then remove it.
If you don't, you should try an attenuator (they cost about a fiver) to bring the signal levels down.
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Thursday 25 August 2011 8:23AM
T. Curry: All content on PICK TV has already been shown, when they say a "new series" they mean for their channel.
If you want to watch new programmes, stick to BBC One, BBC Two, ITV1, Channel 4 and Channel 5.