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need circuit schematic for 2 way radio ( walkie talkie)

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huji

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walkie talkie schematic

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..
 

walkie talkie circuit diagram

A 49 Mhz Walkie talkie schematic is available. This and much more can be found out at :

https://jap.hu/electronic/rf.html

check it out it works i've tried it !

bye
 

walkie talkie schematics

Hi,

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...
 

hay everyone can help i need it plz help
everyone have this schematic insert here
 

how to increase the 49 mhz walkie-talkies receiver sensitivity?
how to add no of transistor in the audio section how?
 

Re: walkie talkie schematics

Hi,

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

Dave
 

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