06 May 2012 - bayside2000

IBA Engineering Announcements 8th November 1988

IBA Engineering Announcements following publication of the government white paper on the future of broadcasting.

hello again and welcome to our weekly

bulletin of engineering information from the iba published at last the white paper on the future of broadcasting and while all the implications begin to sink in we look briefly at the main points i'm also the technical realities of squeezing in more channels on UHF and the emerging technology of direct microwave distribution within local communities not forgetting our regular transmitter news we've our usual roundup of special announcements and full details of just one new television relay at a denis in county fermanagh the Laurel waited white paper on the future of broadcasting contains many radical proposals some of them discussed widely in advance of the publication the government wants to provide more choice for viewers while still safeguarding quality and standards the choice will come from new technologies and methods of delivery and to oversee all commercial television a new body is to be formed incorporating the duties of the IBA and the cable authority the independent television commission as it may be called will have a lighter regulatory touch and all transmission arrangements will move progressively

into the private sector among the plans for terrestrial television itv is to be renamed channel 3 with stronger emphasis on its regional characteristics a fifth UHF channel is due in about 1993 and will be a national service but covering about 65 to 70% of the population a sixth channel is also proposed if it proves technically possible new multi-channel local franchises will be on offer from 1991 onwards using the new microwave technology more on the technical problems of extra channels in a moment with the Astra and BSB satellites both to you next year there are already several new channels well on the way the government now intends for the IBA to advertise the two remaining UK DBS channels these could be on the air in 1990 on the radio front plans for three new national networks and hundreds of local stations john whitney director-general of the iba was quick to point out that sound judgment will vary in striking the balance between commercial opportunity and securing program diversity and quality he also said that the IBA will be fighting hard to ensure that its staff formed the nucleus of the new ITC an IBA chairman

Lord Thompson spoke out on last night's Channel 4 News first of all III a self-interested remark I do wish you would stop talking about scrapping the IBA I think of the government is wise and Parliament is wise and this what will happen is that the IBA and the cable authority who both had a good track record that the Home Secretary was generous about in the House of Commons it will in fact provide the basis for this new regulator a body this new licensing body I should perhaps say IPA chairman Lord Thompson and we'll have more reaction and analysis next week but what are the technical implications of more terrestrial channels the present for television networks in the UHF band reach well over ninety nine percent of the population to achieve this amount of coverage to requires a vast network of transmitters built up over many years so what are the prospects for additional channels there are 51 high-power main transmitting sites and more than 840 relays each equipped with four sets of transmitters in all there are nearly three-and-a-half thousand UHF transmitters and they all have to share just 44 channels available

to the broadcaster's planning this number of transmitters to fit within such a small number of channels is a highly complex task there has to be international coordination so as to avoid interference and a UHF planning conference in Stockholm in 1961 Glade the Foundation's most European countries have only three national networks on UHF the United Kingdom was fortunate to obtain enough high-power Channel allocations for four national networks so is there room for any more the one thing certain about the present uhf bands is that it won't be possible to have another national service with the same coverage as the present for in many areas its difficulty not trying to squeeze in small relays to extend existing coverage so other any spare channels at all what about the gap between bands 4 & 5 that's channels 35 36 and 37 and 38 channel 38 has long been used by radio astronomers it's unique in the UHF band in being a quiet channel allowing radio astronomers to listen to signals from the stars without interference from man-made sources it seems most unlikely that this channel could be used for

television for many years channels 35 36 and 37 have been used for airport radars however the airport radars have already vacated at tunnel 35 and are expected to stop using 37 before too long they'll continue to use channel 36 for the time being but that does give two possible extra channels for television 35 and 37 while an extra couple of transmission channels wouldn't be enough to give complete national coverage it does raise the possibility of introducing new program services with limited coverage using channels between bands 4 & 5 wouldn't be without its own problems domestic VCRs are connected to televisions through a UHF modulator and they will need retuning to avoid patterning and unlike the introduction of the fourth channel which in most cases could be received simply by tuning in an extra button on the receiver viewers would almost certainly need a second UHF aerial dye flexed with the existing aerial but what about VHF bands 1 & 3 were taken away from broadcast use when 405-line television closed down and are now allocated to land mobile radio there is one other possibility and that's to use a system known as MVDs

microwave video distribution a microwave transmitter would be sited on a high point such as a tall building small dishes could pick up perhaps a dozen or so extra channels because of the screening effects of trees and buildings not everyone would be able to receive signals directly the MA TV concept could of course be used to increase coverage with a single receiving antenna feeding a block of flats a group of houses we're currently carrying out some test transmissions in the 12 gigahertz DBS band in the London area potentially this could give viewers extra channels with all the benefits of the Mac system and cheaply simply using a further small dish and lnb to feed an existing DBS receiver more about this and other new developments over the coming weeks some radio news now and last week the Home Secretary Douglas Hurd gave the IV a the go-ahead to begin detailed planning for 20 community radio stations they will be located within existing ILR franchise areas and will come on air next year but there's a warning for pirate operators from January the first anyone convicted of illegal broadcasting

will be disqualified for five years from applying for a license from the proposed radio Authority if you are in the trade and you'd like to hear more about new developments we have just a few places left on our next dealer visit this Thursday here at Crawley court near Winchester if you'd like to come along please phone Diana cousins on Winchester ate double to 587 as soon as possible the visit starts at about 10:30 and finishes by 4:00 special announcements now starting in Norfolk where tackle stone is off today until 12:30 for electricity board maintenance there is also the possibility of reduced power until 5:00 p.m. sandy Heath and Sudbury won't be affected in Devon Beacon Hill was due to start reduce power at 9:00 a.m. and will continue until 9:00 a.m. tomorrow because of engineering work in Herefordshire Kington is off this morning between 9:00 a.m. and 10:00 a.m. for engineering work tomorrow in Wales landowner will be off from 2:00 a.m. to 6:00 a.m. for work on the aerial switching frame again in Wales tomorrow ponta prete will be off from 9:00 a.m. to 5:00 p.m. because of work by the

electricity board on Thursday and Scotland Craig Kelly will have occasional short breaks in transmission lasting up to 5 minutes these will continue until the 21st of this month because of work on the aerial feeder cables also on Thursday in whale hurm Dothrak will be off between 9:30 a.m. and 3:00 p.m. for electricity board maintenance staying in wales the true castle relay station will be off on Thursday from 12 until 3 p.m. for engineering work also on Thursday Arbor craft will be off twice between 8:30 and 10 a.m. and again between 4:00 and 5:30 p.m. and finally in Scotland starting on Monday the black your transmitter will be on reduced power between 8 a.m. and 5 p.m. this work will be on each day up to the 25th of November because of repairs to the upper aerial more details locally on oracle page 297 new relays now and in county fermanagh Eden II is now in the air it's designed to improve reception for about 520 people in Italy itself as well as in the village of Lac and its surroundings about 20 people in lac will receive only a marginal service although we've arranged to give them as much signal as possible

Ulster television and TV am more on channel 62 and channel 4 on 55 group CD aerials and he did vertically polarized engineering County Fermanagh is now on the air and that's all for this week but do contact us if you have any technical queries on independent broadcasting our address engineering information independent Broadcasting Authority Crawley Court Winchester Hampshire ASO 21-2 QA our telephone number is Winchester that so 962 8 double to four four four to make it a local call from anywhere in the country you can also dial our link line at zero three four five oh seven eight seven eight seven well we hope you'll join us again next Tuesday at 10 past 9:00 so from Marie Nicholson and from me Bruce Randle good bye until next week

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