Hi,
I would like to bulid a two way radio ( walkie - talkie) for my little sister range around 1-5km.. Does anybody have the circuit schematic for it.. thanks..
there are several part that i dony understand. what is number 1,4 and 6.. how many turns for tranformer 3 and 5.. what is the value of inductor 2 (henry).. if i build 2 of these it can automatically works as a walkie talkie?? thanx...
there are several part that i dony understand. what is number 1,4 and 6.. how many turns for tranformer 3 and 5.. what is the value of inductor 2 (henry).. if i build 2 of these it can automatically works as a walkie talkie?? thanx...
1,4,6 are 3 sets of contacts on a switch that you operate to switch between transmit and receive
Inductors 3 and 5 are a bit trickier as these will be factory produced and probably within metal cans
Inductor 2 is primarily some base loading of the telescopic whip to get it a bit closer to resonance probably ~ 10 turns airspaced no former would get you into the right area
you can see that the inductor you have labelled as 3 is slug tune. its the tank circuit of the 49MHz oscillator and also matching to the antenna
inductors 3 and 5 are likely to be the stumbling blocks. Maybe others mite have some other suggestions