The receiver, frequency-agile like the transmitter, has selectable IF bandwidth, a security command feature, DTMF and a repeater transmitter enable circuit. Info: www.tftinc.com.

Amateur radio operator [KE4FOX] wanted to build his own 2M fox hunt transmitter for use at conventions ... low-pass filter combined with a hardware DTMF decoder, all controlled by an ATmega328P ...