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Schematic Interpretation
49mhz walkie talkie schematic help?
I need help interpreting this schematic for a 49mhz walkie talkie http://i25.tinypic.com/jzjf2p.jpg. Here are my interpretations of the transmit/receive paths tx: http://i26.tinypic.com/2nr1xn8.jpg rx (when all switches are switched): http://i25.tinypic.com/2dgrhxz.jpg Please let me know where I went wrong (I'm sure I did somewhere). Also, I would like to know what 5 and 3 are on the schematic, and how they are set up. They are some sort of inductor, but I don't know any more than that.
Transformers, huh? Thanks, that info helps. So there isn't a tank circuit in this schematic?
Item 3 would normally be called an IF transformer, though this design isn't a superhet receiver so technically it is just a tuned transformer operating at RF. Item 5 is an audio coupling transformer, which presents a high impedance to the transistor amplifier but has a low impedance secondary to improve power transfer into the loudspeaker.
Ix TX mode, the speaker acts as a microphone. The morse code key introduces positive feedback into the AF stages, effectively turning the amplifier into an oscillator (as you've probably heard happen with a PA system).
Modulation and demodulation are done simply by running the transistors outside their linear regions! This will cause audio distortion, but human hearing is amazingly tolerant (and anyway, it's a **toy** for crying out loud). The RF signal will be noisy and full of harmonics, but the tuned transformer in the antenna circuit will help to clean it up.
** edit ** Yes, there is a tank circuit: the tuned circuit formed by item (3) is used as a tank circuit on transmit, as well as tuning the receiver.
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