you find a photo of my homemade transceiver for the 70 cm amateur
radio band. This small circuit incoporates a small narrow band
and receiver for 400 MHz to 470 MHz with an output power of 1 W. The
microcontroller feeds the Dorji module with transmit-, receiver-,
bandwidth- and squelch information via a serial telegram. All
what is needed is a microphone, speaker, PTT an some power from a
single lithium-Iion cell. See full documentation link above.