I am planning to modify and build this circuit, it is essentially a Walkie-Talkie and therefore needs to transmit and receive audio. Unless I am mistaken this is achieved by switching all four of the arrows from r (receive) to t (transmit). I would like the circuit to be in normally receive mode and only change when a PTM is pressed. I have considered using relays and a variety of transistor circuits to do this but I would like this circuit to be relatively small therefore multiple DPDT relays is not ideal, is there any other way of doing this? Also I am a little confused about the inductor just below the antenna, I was going to make a ferrite core inductor unless anyone can direct me to a component I could buy with the correct number of coils.
Thanks in advance.
Thanks in advance.