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t previews many of the top twenty programmes in colour categories colour tags 405 line 625 line bbc facts post office uhf vhf your questions answered may 2019 august 1969 by independent television authority how do i watch independent television programmes now by means of one of some forty ita vhf transmitters operating in band iii channels 6 to 13 these stations send out all itv programmes on the 405 line system in monochrome black and white television signals from these stations reach you either directly from your own aerial or via one of the wired relay systems will i be able to continue to receive these vhf transmissions in future yes certainly for some years to come but in many areas you will soon be able to receive the same itv programmes often rather better on the shorter uhf wavelengths bands iv and v channels 21 to 34 and 39 to 68 but why should these new uhf transmissions be any better than what i get now the new uhf stations will transmit in colour and with the newer 625 line system and are thus capable of providing pictures with better definition and less visible line effects as you have probably noticed all television pictures are really made up of a series of horizontal lines on the bigger screens this line structure can be easily seen and limits the overall quality of the picture you may remember that the 405 line system was introduced as long ago as 1936 when britain began the world s first regular high definition television service grand prix award winning programme atv will i need to have a new receiver to watch ita uhf 625 line transmissions not for black and white reception if you already have a receiver capable of getting bbc2 transmissions this should be quite suitable without any changes for ita uhf on the other hand an older 405 line only vhf receiver will not be able to pick up ita uhf although this should continue at least for some years to come to provide exactly the same service from ita vhf as at present but do you consider that 625 line pictures show a real advantage over those of the 405 line system it would be misleading to suggest that the improvement of 625 over 405 lines is a dramatic one but it represents a useful gain of overall picture quality for the more discriminating viewer particularly those with the larger 23 inch screens but will the actual programmes be the same on uhf as they are on vhf yes this is a process of duplication not a new programme network and is the fact that the transmissions will be on the 625 line system the only major advantage of the new uhf stations no while all british 405 line vhf transmissions are limited to black and white monochrome television most of the uhf transmissions will carry the additional information required for full colour pictures and in addition the uhf transmissions should suffer less from certain forms of electrical interference including the spots produced by the ignition systems of passing cars department s rosemary nichols as annebelle hurst and peter wyngarde as jason king atv presentation but to see the pictures in colour i will need a colour receiver yes a monochrome receiver cannot normally be converted for colour reception on the other hand programmes sent out in 625 line colour can be viewed on a standard uhf receiver in black and white and the colour receiver reproduces monochrome transmissions in black and white but let me get this clear the itv colour programmes which will go out on uhf will be the same as those which will also be radiated on vhf in black and white that is correct though we believe that programmes seen in colour add a totally new dimension to their enjoyment and impact suppose i already have a colour receiver or intend to obtain one before the ita colour transmissions begin will this be suitable and in the meanwhile can i use this receiver to watch the vhf transmissions of ita and bbc1 yes to both questions any colour receiver suitable for the reception of present bbc2 colour transmissions will equally be suitable for itv and bbc1 colour and dual standard colour receivers will provide reception of the monochrome transmissions on vhf however once ita and bbc1 uhf transmissions begin it can be expected that single standard 625 line only receivers will appear on the market these would not be suitable for 405 line vhf transmissions but will i need new aerials for all these different uhf stations i already have two different vhf aerials and a uhf aerial on my roof no there should be no need for more than one uhf aerial and this will usually be lighter and more compact than the older vhf aerials a single uhf aerial should be quite capable of giving good reception of all the local uhf transmissions whether from ita bbc1 or bbc2 stations rogues gallery diane cilento granada but i believe that my uhf aerial is highly directional and had to be very carefully pointed towards the bbc2 station surely this will not be right for an ita station all the uhf transmitters whether for ita or bbc are being installed at the same sites and will use the same aerial masts or towers so that the signals will come from exactly the same direction so since i already receive bbc2 signals on my uhf aerial is it quite certain that i will receive ita uhf without any changes or adjustments whatsoever this we hope will usually be the case though it is possible that in some instances a certain amount of adjustment or even re positioning of a uhf aerial may be needed in order to receive equally good signals from ita and bbc uhf transmitters but this should be the exception rather than the rule and the same uhf aerial would be suitable for either black and white or colour reception fundamentally the aerial requirements for colour and black and white reception are the same an aerial which gives really good black and white pictures will be equally suitable for colour but on the other hand an inadequate or poor aerial would have a much more noticeable effect on colour reception than on black and white it is thus always advisable to have an efficient roof or loft aerial for colour reception and if possible also for black and white reception your local dealer or rental company should be able to advise you on a suitable type of aerial for your particular location typically a uhf aerial having about six compact elements will be suitable in areas of good signal strength about 10 to 12 elements for medium strength areas and more than 12 elements either in a single array or distributed in stacked forms two or more smaller arrays correctly used together for longer distances or where your house is screened from the transmitter it is always better to have too much signal than too little and a good aerial well installed is likely to prove the cheapest in the long run since the length of a uhf aerial element is only a few inches even aerials with many elements are often more compact and lighter than those with far fewer elements for vhf is there any possibility that although i now obtain good itv pictures on vhf i shall not get a good service on uhf it will take some years before the new ita uhf network can cover as much of the country as is reached on vhf so that for some time to come there will be areas where only vhf will give good pictures the satisfactory service area of a uhf station is usually appreciably less than for an equivalent station on vhf for this reason the ita uhf network is likely eventually to comprise some sixty main transmitting stations and some hundreds of lower power relay stations to serve particular localities but it is hoped to serve some four out of every five persons in the uk on uhf by roughly the end of 1971 and the first seven stations will cover about half of the population by about the end of 1969 the dark ages a documentary series to be shown in colour anglia you said that only one uhf aerial should be needed for all three uhf services does this mean that once the uhf signals are available i can stop using vhf altogether and take down the vhf aerials on my roof once you are able to watch ita bbc1 and bbc2 all on uhf on the 625 line system and in colour if you are lucky enough to have a colour receiver there would be little point in watching the same programmes on vhf eventually it is possible that there may be additional programmes using 625 lines on vhf but this cannot happen for many years to come so you hope that despite the shorter range of uhf transmissions the uhf network when complete will cover the country roughly as well as the present vhf network that is true but it must be stressed that a large network of this type cannot be built overnight there will be some areas where uhf coverage will not be complete for a considerable number of years but you can be sure that ita will press forward with building the new uhf network as fast as possible so the new network must represent a busy time for the ita engineers then busy indeed the building of this new uhf 625 line colour network represents one of the most intensive television engineering projects ever undertaken for your better and more colourful viewing categories colour tags 405 line 625 line black and white colour faq uhf vhf when ita colour will come to your district may 2019 august 1969 by independent television authority the independent television uhf colour service will start in some areas on 15th november 1969 these areas will include london and possibly also the midlands lancashire and yorkshire a few weeks later the service is due to be extended to central scotland and to two main transmitters in the south of england rowridge and dover seven more main stations are due in operation during 1970 and eleven main stations in 1971 or the early months of 1972 twelve lower power relay stations to serve specific districts should come into operation in 1970 and another 22 by the end of 1971 or early 1972 by the end of this first phase of the uhf network there will thus be about 60 ita uhf stations on the air with many more to follow in subsequent years freewheelers a tense moment for chris chittell and carole mowlam southern all these uhf transmitters will carry the combined colour black and white transmissions from the time they are taken into service the 405 line black and white only version of the same programmes will continue to be radiated simultaneously from the existing network of ita vhf band iii stations the main transmitters in the first phase with ita channel number aerial polarization and group are 1969 crystal palace london 23 h a sutton coldfield nr birmingham 43 h b winter hill lancashire 59 h c emley moor yorkshire 47 h b black hill nr glasgow 43 h b rowridge isle of wight 27 h a dover kent 66 h d 1970 waltham nr melton mowbray 61 h c wenvoe nr cardiff 41 h b mendip somerset 61 h c beckley nr oxford 60 h c pontop pike durham 61 h c divis nr belfast 24 h a tacolneston norfolk 59 h c 1971 sudbury suffolk 41 h b belmont lincolnshire 25 h a bilsdale yorkshire 29 h a sandy heath bedfordshire 24 h a caradon hill east cornwall 25 h a redruth west cornwall 41 h b durris kincardineshire 25 h a craigkelly fife 24 h a caldbeck cumberland 28 h a 1971 72 heathfield east sussex 64 h d selkirk selkirkshire 59 h c low power relay stations planned for 1970 guildford reigate tunbridge wells hemel hempstead brierley hill bromsgrove stoke on trent nelson colne pendle forest wharfedale sheffield chesterfield kilvey hill low power relay stations planned for 1971 or early 1972 hertford high wycombe kidderminster malvern lark stoke darwen haslingden skipton todmorden saddleworth lancaster halifax keighley rhondda caerphilly pontypridd fenham salisbury brighton bath newhaven hastings the aerial groups a e refer to the recommended uhf aerial group needed to cover the allocated uhf channels in the district categories colour tags central scotland lancashire london midlands south of england yorkshire a brief guide to some television terms may 2019 august 1969 by independent television authority the term uhf means ultra high frequencies and in this connection refers to television stations operating in bands iv and v that is in channels 21 to 34 and 39 to 68 using radio frequencies between 470 and 850 megahertz the term vhf means very high frequencies and refers to television stations in band iii channels 6 to 13 using frequencies between 174 and 216 megahertz the 405 line system is the television system or standard used in great britain since 1936 and currently used for all vhf television stations in bands i and iii adoption of the alternative 625 line system as the primary british television system of the future resulted from official government planning for british television and has been in use for british uhf television transmissions since 1964 the avengers patrick macnee and linda thorson thames presentation the difference in line structure i e number of horizontal lines making up the picture between the 405 and 625 line systems is only one of a considerable number of differences between the two standards eventually the 625 line system may be used in the united kingdom for vhf transmissions as well as for uhf but this is unlikely to happen for many years yet during which the 405 line standard will continue to be used on vhf a single standard receiver is a set intended for reception of pictures on only one standard at one time this usually meant 405 line only sets but now often means 625 line only sets a dual standard receiver means a set capable of receiving both the 405 line and 625 line transmissions all british colour television transmissions are on 625 lines in uhf using a compatible colour system which means that the pictures can also be received in black and white on a black and white only receiver colour receivers can similarly pick up black and white only transmissions and display them in black and white reverse compatibility categories colour tags 405 line 625 line channels dual standard reverse compatibility uhf ultra high frequencies very high frequencies vhf the key to good uhf pictures may 2019 august 1969 by independent television authority most uhf reception problems are due to the use of an inadequate aerial system or its poor location or installation the strength of uhf signals varies a great deal depending upon how far away you are from the local transmitter and the amount of screening from intervening hills and buildings the weaker the signal the more important is the need for a really effective aerial correctly positioned and aligned on the transmitter an important part of the aerial system is the special cable coaxial cable which links the aerial to your receiver different cables vary in efficiency and it is most important for uhf reception that your aerial installer fits a good low loss cable a special leaflet good viewing of independent television available from the ita engineering information service gives full advice on aerials and other factors which help you to obtain good colour or black and white reception of ita stations the 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