Yaesu FT-7900/8800/etc to Kantronics KPC3+ TNC cable KPC3+ DB-9 male CT-39A 6-pin DIN male pin# / desc pin# / desc / wire color ---------------- ------------------------ 1 TXA (out) <---> 1 Pkt In black 5 RXA (in) <---> 5 Rx 1200 yellow (10K ohm imped) 3 PTT (out) <---> 3 PTT red 6 GND <---> 2 GND brown Yaesu Data DIN connector looking at back of transceiver (with the CT-39A wire colors shown in parenthesis): Data In (black) --- 1 2 --- GND (brown) PTT (red) --- 3 4 Tx 1200 (yellow) -- 5 | 6 Note: The Yaesu FT-7900 and FT-8800 manuals have the CT-39A wire colors are specified incorrectly in the wiring table (but the wiring diagrams are correct), and they do not match actual cable wiring nor the wiring label on the CT-39A package.