bertieboy1 said:
woodentop,
What do you do with the foil screen at each connection.I just cut it off at each end as the foil and braid are making contact all along the cable,Not sure about cable with foil better for digital personally I haven't found it makes any difference.
You usually have to retune at each different site (sometimes you don't),I find your methods ever complicated - just go into the TV menu and select tune or auto tune the teelly does the rest.
Hmm, I suspect a bit of misunderstanding.
The physical location of the foil matter not as once it is inside the plug the plug will 'extend' the screen anyway, so cutting it off at the end of the outer is not a problem - so long as there is still braid present to make contact.
Firstly using co-ax with foil. If you got interference of any kind on an analogue TV at worst you might get a flicker, at best perhaps a few white dots across the screen. With DTTV interference will likely cause the TV to have problems - at best perhaps a little pixelation, at worst a picture freeze or even disappearance whilst the TV gets its brain back in order. Remember with DTTV it is a computer that thinks it is a TV, so anything that will upset a computer will play havoc with digital TV. Hence foil screening is better.
As an aside, the TV aerial cable under our landing floor has the old brown co-ax with the whispy braid. There is a CAT5 cable perhaps 6in away from it carrying our incoming broadband from modem to router. The TV in our bedroom consistently refuses to show the EPG - mainly 'no information' or gets the programmes muddled. If I disconnect the CAT5 at both ends, lo and behold the EPG works properly. (No, I cannot take the landing floor up to replace the cable as it has a fitted carpet and I have a wish to survive a few years longer......)
The reason for doing a full install retune is to do with the way these computers-that-think-they-are-TVs work. When you do an autotune it does not necessarily overwrite what is already there. If the TV finds a signal carrying the BBC mux and it already knows about BBC then it may well not replace what it knows and stick this second mux up in the 800's, and so for all other stations. It is also not uncommon for caravan sites to be in range of more than one transmitter (Tx) especially if the site is in an elevated location, and if an 'interfering' Tx has lower channel numbers than the one you should be using the TV may not decide to use the 'correct' Tx even if there is a significant difference in signal level or quality. With more modern TVs if the two Tx's received are in different TV regions then the TV will ask which region to use, but if they are the same region then it may not care.
For the record I differentiate here between channel and station. Each multiplex (mux) carries a number of TV and radio stations (e.g. BBC1, BBCRadio4 etc) but only occupies one transmitter channel or frequency, as distinct from analogue TV where one transmitter channel carried one TV station - BBC1, ITV, Ch4 or whatever. If you follow my suggestion then you will need the transmitter site numbers to enter into your TV for tuning purposes. If your TV only accepts frequencies (which some do) then take the channel number, multiply it by 8 and add 306 to get the frequency. At the time of writing in the UK we only use channels 21-33 and 39-60 which may be reduced even more (at the top end) if HMG decide to sell off the 700MHz band for mobile phones/data.
I hope that helps.