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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..

    •   Alt24th March 2005, 09:41

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    walkie talkie circuit diagram

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

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

    check it out it works i've tried it !

    bye



    •   Alt24th March 2005, 20:23

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    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...



    •   Alt25th March 2005, 18:59

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    Re: need circuit schematic for 2 way radio ( walkie talkie)

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



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    Re: need circuit schematic for 2 way radio ( walkie talkie)

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



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    Re: walkie talkie schematics

    Quote Originally Posted by huji View Post
    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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