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Freeview and 4G
This article from The Register shows how the wonderful Ofcom in their infinite wisdom wants to allocate 4G onto Channel 60 which affects Winter Hill.
http://go.theregister.com/feed/www.theregister.co.uk/2011/06/02/4g_interference_freeview/
http://go.theregister.com/feed/www.theregister.co.uk/2011/06/02/4g_interference_freeview/
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It's possible you've read a misprint. No TV will use channels 61 & 62 after re-organisation.
Channel 61 moves to channel 49.
Channel 62 moves to channel 50.
This will include transmitters that have already DSOd eg Winter Hill.
Chris.
Next time you may even spell Ofcom correctly
Also I think, you need to read the consultation - it's a bit more complicated than that. Close to mobile base-stations the signal can be very much stronger than the DTT signal from far away. This may overload the amp + analogue tuner in your DTT receiver.
Ofcom seems to focus on the existing DTT installations, but
Lars
No s/he hasn't. The data from digitaluk still doesn't reflect the "800MHz clearance" proposals. :eek:
{Probably because the spectrum planners are still to finalise things and, anyway, it requires international clearance negotiations to be completed.} :yawn:
The latest DSO guide (25/5/11) for my region from Ofcom says:
"In order to align the frequencies released by digital switchover for alternative uses with those released by other European countries, UHF channels 61 and 62 will be cleared’ of digital TV services over the coming years. UHF channels 39 and 40 (which were previously among the channels due to be released for other uses after switchover) will instead now be retained for TV broadcasting.
In order to minimise changes to domestic aerial groups, the general approach for adopting these changes is that multiplexes using channels 61 or 62 will move to channels 49 or 50, and some multiplexes using channels 49 or 50 will move to channels 39 or 40. Other channels may also be affected in some cases. The changes will either be carried out at digital switchover, or sometime after switchover completes (e.g. during 2013). If the changes are to be carried out at digital switchover, an updated version of this guide will be issued."
He
OK so it's just not taking into account the clearance. So *if* it goes ahead and 800mhz is cleared then that MUXA will be on channel 49 rather than 61 then. Makes sense. In which case my channels are far enough away from channel 61 that it shouldn't be an issue here although I still don't like the fact the HD MUX is on channel 58. That's the one I use the most!
They have a cunning plan for that..... http://stakeholders.ofcom.org.uk/binaries/consultations/800mhz/statement/OCR.pdf
Much more than a few meters from a 4G mast - maybe like 100-500 m if you are 30-60 km from the large DTT site.
Lars
If the use of "Ofcon" was not deliberate (I suspect that it was), it is a very apt typograhical error.
I think not - Ofcom will get many points* in any 'good governance' audit.
Lars
* Except the Ofcom 'DAB department' that should have stopped the disaster long ago - and will get a big minus.
I think we'll need to agree to disagree
Ha ! I don't think so ! It's all a bit too late to be worrying about the 4G/DTT interference problem now isn't it ? Should have flagged this way before agreeing to the UK giving away the band.
Ofcom over the years have done a fine job destroying just about all that was good and worthwhile about commercial TV and radio in this country.
The problem with Mendip PSB1 going from 61 to 49 is that the adjacent Wenvoe transmitter already broadcasts at 50kw power on 49.
The two can't co-exist on the same frequency, so either the Wenvoe allocation will need to change to accommodate 49 at Mendip, or PSB1 at Mendip will have to go to an alternative frequency. Not sure it could use 50, as I think thats in use at one of the Bristol relays.
I think Mendip PSB 1 will be using Ch 48, it can't yet, because Oxford is using it for Mux C until Sept this year.
However, that will sandwich Mendip PSB 1 between two of Wenvoe's muxes on 47 and 49. There goes any hope of yanking the aerial out halfway through a scan, to avoid the wrong set of channels !
No, because Wenvoe's service on UHF 49 would itself be shunted down to UHF 39.
I'm assuming you mean BBC-A (Mux A is the pre-DSO name for SDN). Note that at: http://stakeholders.ofcom.org.uk/binaries/broadcast/guidance/tech-guidance/West.pdf the affected UHF channels are in RED.
This OFCOM document states at the back:
http://www.digitalspy.co.uk/digitaltv/news/a322823/ofcom-acts-on-4g-digital-tv-interference.html ...where Ofcom will give filters out to affected households.
Was reading some (Ofcom?) document last week about how the UK's mid range (600 MHz?) clearout might have to be rethought if the 700 MHz one becomes universal , but can't find the link now...
http://stakeholders.ofcom.org.uk/binaries/consultations/dtt/summary/dttcondoc.pdf
Read it and weep
Quote of the day:
'Existing DTT receivers and aerials were designed to receive signals across UHF Bands IV and V (470-862 MHz), including the whole of the 800 MHz band. This means that, in addition to receiving the wanted DTT signal, they may also pick up unwanted signals from new mobile base stations that could result in interference and degraded DTT reception. Our modelling shows that, absent any mitigation, up to 760,000 households could potentially be affected by this interference problem....'