circuit

I collected lots of old radio parts and I can still get it from shops

@Ag

how can a transmitter control airplanes? What kinda process going on in the suspect when we use a transmitter? (guess,turning a bunch of relays?)

RC planes, uses high frequency PWM to control servos.

hassan29 said:

pls give me this diagran and pcb lay out soon

Click to expand...

Would you like fries with that order sir?

You have been asked over and over again for additional information like frequency, intended application and other questions. You have not answered any of the questions and "pls give me this diagran and pcb lay out soon" is not answering the questions. This is likely because you don't know what you actually want beyond walkie talkie.

Now, in keeping with off topic but interesting is the LOS (Line of Sight) thing and wave propogation. This is a good basic read on the subject of radio wave propogation. It keeps things relatively simple.

Ron