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Alinco DR-735T

The DR-735T is a dual-band FM mobile with a rear data interface, making it a clean node radio without microphone-jack hacking. Audio & PTT: Use the rear mini-DIN DATA jack for discriminator audio out, modulation audio in, and an active-low PTT line into a USB audio interface. Consult the DR-735 manual for the exact pinout of your unit. CAT: No live computer CAT for frequency control in node use — set frequency/CTCSS via programming software (CHIRP supports the DR-735 family) before deployment. Drive PTT from the DATA-port line. PTT: Active-low; key from your interface's PTT output (CM119 GPIO / RTS-DTR / Pi GPIO).