[Andy B]

How does TV Transmitters work, and what do they mean about "Horizontally Polarzise/Vertically . ?????

[The_First_Tiger]

Phewwwwwwwwwww.

Who want's to start this off?

O.K. Polarisation:

In simplistic terms, (and I stress simplistic), it the orientation of the transmitted signal. If it's horizontally polarised, you need the elements of receiving antenna laying flat, as it were. If it's vertical, you'll need the elements vertical. In both cases, it needs to be 'pointed' at the transmitter.

Any reason why you are asking about TV transmitters on the radio forum? Admittedly radio transmitters work in the same way. Perhaps us radio people is more smarter than wot those on the TV forums r.

Next contribution please.

[pjb007]

I think you have posted in the wrong place!

You may find the answer to your question at howstuffworks.com

Hope this helps!

[redcar1]

TV transmitters work by means of complex physics which I don't understand despite having an A-level in it. I do seem to remember that the polarization is the orientation of the electric vector of the electromagnetic wave carrying the TV signal (the magnetic vector is at right angles to it). Hence your aerial must have the same orientation so that the waves can induce electric currents in it, which is how it receives the signal.

Generally main transmitters use horizontal polarization and the small relay or 'fill-in' transmitters use vertical. This is to avoid interference where the relay transmitters are using channels close to those of a main transmitter which can be recieved nearby (e.g. in my neck of the woods the Guisborough relay uses channels adjacent to those used by the Pontop Pike main transmitter which could cause interference in nearby areas where Pontop is used, and vice-versa).

[Jim Rae]

Isn't a TV transmitter a TV running backwards?

Same with radio.

So if you take the process from the aerial to the TV picture and reverse it, you have a transmitter - of sorts.

You of course would need the power inherent in a transmitter to send the signal somewhere.

I didn't tell you to try this, but if you take a loop induction system - like the kind used for hearing aids - and disconnect one end of the loop, you get a hell of a transmitter!

Up to thirty or so miles on a good day....

[pmcmillan]

Quote:

Originally Posted by Jim Rae

I didn't tell you to try this, but if you take a loop induction system - like the kind used for hearing aids - and disconnect one end of the loop, you get a hell of a transmitter!

Up to thirty or so miles on a good day....

A guy at Uni ran a pirate radio station using one! The mad idiot connected it to the lightning inductor to extend the range. Guess who had a very big bang in his room during a storm!! It fried his turntables, amps, and all electronics in his room.

[pmcmillan]

http://homepage.ntlworld.com/martin....%20Systems.htm

[Jim Rae]

I have been a few yards away from a direct hit on a lightning conductor during a storm and never care to repeat the experience!

Don't try it at home...

[Andy B]

Quote:

Originally Posted by pmcmillan

http://homepage.ntlworld.com/martin....%20Systems.htm

Cheers just what I needed

[Jim Rae]

Good site - very interesting.