RF TRANSMISSION OF RANGE 1KM

[KIRAN A HOLLA]

HELLO EVERYBODY,

I NEED DETAILS OF RF TRANSMISSION/RECEPTION OF RANGE WHICH IS MORE THAN 1 KM..
THE DATA IS DIGITAL OF 8 BITS.

PLEASE SOMEBODY GUIDE ME, HOW TO GO ABOUT WITH THIS PROJECT.

 

[RossiRPI]

You can use an already made RF module or you can build your own... For an already made module have a look at www.rfsolutions.co.uk they have the AM-RT4/5-XXX. the XXX will be the frequency at which you want the trahsmision to be. If you want to build your own then you can use the max1470/1/2/3 transmiters and receivers from maxim though it's not that easy to find the required oscilators. Just google it.

Rossi

 

[KIRAN A HOLLA]

thanks rossi for your reply.

i will go through the site which you have specified. do you know the antenna size..i might be using 433MHz osc.

 

[waseemsh]

hi,

You can use a half wave dipole whose length at your frequency should be 0.3464m.

Br.

 

[RossiRPI]

I doubt you will use a 433MHz osc since they dont make 433MHz oscilators!!! The tranceivers use oscillators ranging from 4 to 14 MHz, just read their datasheets. As to the antenna... It will be easiest to just use a 50 Ohm antenna which you can buy from most electronic shops. Otherwise you can make your won though the only thing I can tell you bout that is that you will have to match the antenna to the circuit which is usually done with an L circuit.

Rossi