Wanted: Television Transmiter Circuits

Have you any idea of what power you will need? or bandwidth, type of TV signal to transmit PAL, SECAM, NTSC etc... What frequency etc...??

Will it be a CCTV system black and white, with sound etc...?

John.

Hi John thanks for your feed back.

Power would have to be sufficient to cover an estimated footprint of approx 400 to 600 square miles,

Using the Pal system, colour and sound transmission, in the UHF Band possibly Digital, then of course there would be a matter of the transmitter aerial.

I realise this is a large project which would need planning permission for the antenna, and licensing for the broadcast transmissions.

Any help would be very much appreciated.

Regards Arnie

I can tell you now that even in some very dark parts of Africa, you will need to use equipment that is fully certified, so your only possibility is to used finished units from certified companies.

Starting from scratch on your own and doing everything, I would guess you need 15 years time to get things up and running and all certifications and licenses that you will need.

In the mean time, HD and digital will be all over the world (analogue completely switched off) and whatever you built will not be seen or heard by anyone......even HD might be on its way out by then......

I would plan to approach this problem in a different manner in your position, buy air time from established TV and satellite companies as a start might be a way to go to....

Thanks for feedback.

I was only trying to help the Guest, since his, or her, question made anonoymously implies secret reasons. You are absolutely correct that certifications are generally required. I compared it to old airplanes, which are certified to fly til they are unfit- at least in the US and Europe and many other places. Actually I had no beef at all and simply thought past the Guest question to their motives. I even remember now that the Tvs we watched made of wood actually had their schematics on browned paper glued inside the back of the TV set.

In some cases uncertified or licensed speech is fully justified. A gound based TV transmission system made of old style stuff would definitely require a license since it wouldn't lend itself to any mobility.

Now I'm curious as to what the Guest thinks of what they have started. Did they find the schematics? What are they doing with them?

The Manuals of the Manufacturers contain the schematics. We know that. The Guest could have simply Googled, Who Makes TV Transmission Equipment and where can I buy their schematics? As an experiment now I might google TV Transmitter Schematics and see what I get.

It would be a nice thing to have a well framed TV Transmitter Schematic on the wall.

I want one.

For good coverage of that sort of area, and presuming it is flat land, and you can elevate the transmitting antenna, it is not the sort of thing you could easily build yourself.

You need approx 100kW transmitter, with Antenna type to give gain, equalling 300kW effective radiated power.

Power supply to the transmitter will need to be approx 150kW, plus any requirements for studios etc.

Depending on exactly what you need this for, it may well be cheaper to purchase a transmitter which is being replaced by a larger unit, at a regular TV station.

This also has the advantage of being properly certified and safe equipment.

In almost every Country I can think of, the local "Authorities" will require to inspect, certify, and perhaps have a say in what is broadcast.

Hope that assists you....