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#1
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In Sheffield we now have the BBC mux on ch63. In most areas it is 12
or 13dB above the ch60 mux. There are hundreds of communal systems originally designed for Group A only, so in order to get Gp B and CD muxes through them the muxes are launched at high levels, typically only 5 to 7dB below the Gp A analogues. These old systems are often working flat out, with excessive signal loss on cable due to age. The head end amps are operating near the limit, so the new mux causes cross mod, which gives the analogue channels a spotty effect and affects the BER on the other muxes. So we have to fit filters to even everything up, and before you know where you are the job has cost the taxpayer or residents two or three hundred quid. Multiply that by a few hundred systems! All this is to accommodate a fudge -- the ch39 mux had to move to allow the absurd temporary HD mux from Emley, and at the last minute someone realised it wouldn't have the reach of ch39, so they upped the power rather a lot. It just shows that they'll use brute power when they're running scared. Oh, and ******** to the analogue viewers on the S Yorks relays that use ch63. They are all wondering why they only have three channels instead of four. They do these things without a thought for the trouble and expense they cause. Of course they were **** scared that Sheffield would have reception problems in the lead up to the election, what with there being a marginal constituency. Bill |
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#2
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" wrote in
message ... In Sheffield we now have the BBC mux on ch63. In most areas it is 12 or 13dB above the ch60 mux. There are hundreds of communal systems originally designed for Group A only, so in order to get Gp B and CD muxes through them the muxes are launched at high levels, typically only 5 to 7dB below the Gp A analogues. These old systems are often working flat out, with excessive signal loss on cable due to age. The head end amps are operating near the limit, so the new mux causes cross mod, which gives the analogue channels a spotty effect and affects the BER on the other muxes. So we have to fit filters to even everything up, and before you know where you are the job has cost the taxpayer or residents two or three hundred quid. Multiply that by a few hundred systems! All this is to accommodate a fudge -- the ch39 mux had to move to allow the absurd temporary HD mux from Emley, and at the last minute someone realised it wouldn't have the reach of ch39, so they upped the power rather a lot. It just shows that they'll use brute power when they're running scared. Oh, and ******** to the analogue viewers on the S Yorks relays that use ch63. They are all wondering why they only have three channels instead of four. They do these things without a thought for the trouble and expense they cause. Of course they were **** scared that Sheffield would have reception problems in the lead up to the election, what with there being a marginal constituency. Bill I know it doesn't help now, but at DSO Sheffield/Chesterfield become main sites in their own right rather than slaves off Emley. Just to make things worse this means both will radiate six muxes rather than the three of most relays. At this instant I'm not sure of the dates, but it is certainly before Emley gets DSO in September next year. -- Woody harrogate three at ntlworld dot com |
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#3
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Woody wrote:
I know it doesn't help now, but at DSO Sheffield/Chesterfield become main sites in their own right rather than slaves off Emley. Just to make things worse this means both will radiate six muxes rather than the three of most relays. Although Sheffield and Chesterfield have been like that for ITV analogue for the last 20 years or so, because of the legacy of Yorkshire TV's 'South Yorks' news sub-region. Both sites have also always carried six muxes since the start of DTT in 1998, so I don't see how that can lead to (extra) confusion ? At this instant I'm not sure of the dates, but it is certainly before Emley gets DSO in September next year. Yes, there used to be more accurate dates I'm sure, but now the DUK website just says '2011' http://www.digitaluk.co.uk/when_do_i_switch/yorkshire -- Mark Please replace invalid and invalid with gmx and net to reply. www.paras.org.uk |
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#5
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On Thu, 6 May 2010 07:04:07 UTC, "Brian Gaff"
wrote: I think Offcom have some dodgy folk making decisions generally, in the technical sense. Take the small Jewish medium wave station in Leeds, passed by offcom recently, after being installed by some cowboy. It basically is built next to an old peoples home, Its aerial is a scaffold pole, guyed up resting on, wait for it, a wine bottle as an insulator. The swr was so bad the engineer got a burn off the earth connection in the plastic shed holding the transmitter. The old peoples home is having serious problems with auto dorr mechanisms, emergency call chords, and the TV system due to the close proximity, and poor earthing of the installation. This has been passed by Offcom. "Never mind the quality - Feel the width" :-) -- Regards Dave Saville |
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#6
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On Thu, 6 May 2010 09:07:01 +0000 (UTC), "Dave Saville"
wrote: On Thu, 6 May 2010 07:04:07 UTC, "Brian Gaff" wrote: I think Offcom have some dodgy folk making decisions generally, in the technical sense. Take the small Jewish medium wave station in Leeds, passed by offcom recently, after being installed by some cowboy. It basically is built next to an old peoples home, Its aerial is a scaffold pole, guyed up resting on, wait for it, a wine bottle as an insulator. The swr was so bad the engineer got a burn off the earth connection in the plastic shed holding the transmitter. The old peoples home is having serious problems with auto dorr mechanisms, emergency call chords, and the TV system due to the close proximity, and poor earthing of the installation. This has been passed by Offcom. "Never mind the quality - Feel the width" :-) I once sent a complaint to the old Radio Authority, about a local radio station that was over-compressed and over-deviating, and included the line "Never mind the quality, feel the bandwidth". They didn't seem to think it was the least bit funny. |
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#7
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#8
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On Thursday, May 6th, 2010 at 14:46:38h +0100, Nemo wrote:
and included the line "Never mind the quality, feel the bandwidth". They didn't seem to think it was the least bit funny. The dullards probably did not understand the reference nor had ever watched the TV show. |
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#9
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On Wed, 5 May 2010 18:42:41 -0700 (PDT), "
wrote: They do these things without a thought for the trouble and expense they cause. Are you sure? Sometimes I'm convinced that they do stuff like this precisely because of the "opportunity for profit" it gives to their chums |
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#10
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In article , Brian Gaff
scribeth thus I think Offcom have some dodgy folk making decisions generally, in the technical sense. Take the small Jewish medium wave station in Leeds, passed by offcom recently, after being installed by some cowboy. It basically is built next to an old peoples home, Its aerial is a scaffold pole, guyed up resting on, wait for it, a wine bottle as an insulator. The swr was so bad the engineer got a burn off the earth connection in the plastic shed holding the transmitter. The old peoples home is having serious problems with auto dorr mechanisms, emergency call chords, and the TV system due to the close proximity, and poor earthing of the installation. This has been passed by Offcom. Are you sure it has?. In my experience with Ofcom there're pretty tight with what they will let on the air and what they won't. There are parts of the engineering code that relate to interference from newly commissioned transmitters that might tho that relates to FM but if there are genuine problems with interference then has anyone complained at all. http://www.ofcom.org.uk/radio/ifi/rb.../eng_code/#2.5 BTW do you know the name and location of the station?... I only know this from a third party, but it kind of gells in with my experiences of their interference finders who get sent out with duff equipment etc. Not in mine;!.. Sigh. We have obviously lost the expertise to know hat the heck is going on! Brian -- Tony Sayer |
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