Hello everyone

what is the best method to transmit a video signal in urban with distance of 1000 feet (approx. 300 m) ?

is this by using low frequency transmitter and antenna or by simply by using a high power ?

thank you in advance for your posts .

I have pleasure to know the answers from your experience

 

The best method involves working within the regulations of your Country's Telecommunications Agency.

 

hello MikeML

ok and ...

 

Without a line of sight, the only legal way to do this would be to modulate the signal using one of the bands that are open to hobby/experimental transmissions. In the US, there are a few such bands, but there are other restrictions, like maximum power, antenna height, ... I'm not completely up to speed on this topic, but you'll need to be very careful to understand your local regulations. Doing this will probably require that you build or buy a transmitter made for the legal band.

 

Hello
ah ok i understood , but the 2.4 Ghz , 1.2 Ghz and 434 Mhz amateur channels cannot be a solution for my problem ?

 

Hello
ah ok i understood , but the 2.4 Ghz , 1.2 Ghz and 434 Mhz amateur channels cannot be a solution for my problem ?

It's very possible they are the only legal solution. BTW, I edited my response, but you already seem to have right idea.

 

the 2.4GHz band and higher need a clear line of sight. google up ham radio TV for alternatives to microwave systems

 

Hello,

If you want to stay within a ISM band, you will have to go higher as 900 Mhz:
http://en.wikipedia.org/wiki/ISM_band

The lower bands do not allow the bandwidth of a video signal.

Bertus

 

your other choice is to go higher and use a tower.

 

Hello
ah ok i understood , but the 2.4 Ghz , 1.2 Ghz and 434 Mhz amateur channels cannot be a solution for my problem ?

Only if you are a licensed amateur, and the signal being transmitted is non-commercial, and meets the third-party content requirements of your country's Communication's Commission.

For example, as a licensed amateur in the USA, I can transmit video for my own purposes, but I cannot do it for a business, or even if someone is paying me to do it.

 

your other choice is to go higher and use a tower.

A higher tower? It's 1000 feet...2 city blocks...1/5th of a mile. Somehow I can't see that as a long distance for an RF transmitter.
It seems to me the only way to need a higher tower is when transmitting from the basement of your building.

 

the 2.4GHz band and higher need a clear line of sight. google up ham radio TV for alternatives to microwave systems

I took your advice (although I'm not the questioner) and found this site. Good stuff and sources for some of the equipment that is required

http://www.hamtv.com/

 

@ #12:
the OP mentioned he did not have a clear line of sight, and most times a little altitude can fix that. other times you just need some attitude.

 

uhf works better to penetrate buildings, and antennas with gain are still rather small. you might have to opint the antenna in a different direction to get a reflection around a building.

 

Does it have to be live video? Can it be a series of snapshots, 1/2 minute old?

 

Hello

thank you for your replies, i want to try and decide .