(10) REC Jack This 3.5-mm, 3-contact jack provides low level receiver audio output for recording. It also outpus voice audio during transmission if the "MONI" is turned on. Peak signal level is 300 mVp-p at 10 k-Ohms. The front panel [AF] knobs do not affect the signals at this jack. (11) REM (REMOTE) Jack By plugging the optional FH-2 Remote Control Keypad into this gold-plated jack, direct access to the FTDX1200 CPU is provided for control functions such as contest memory keying, plus frequency and function control. (12) EXT SPKR Jack This 3.5-mm, 2-contact, gold-plated jack provides variable audio output for an external loudspeaker. The audio output impedance at this jack is 4 - 8 Ohms, and the level varies according to the setting of the front panel [AF] knob. Inserting a plug into this jack disables the internal loudspeaker.

(13) KEY Jack This 1/4-inch, 3-contact jack accepts a CW key or keyer paddle. A two-contact plug cannot be used in this jack. Key-up voltage is +3.3 V DC, and key-down current is 4 mA. This jack may be configured for keyer, "Bug", "straightkey", or computer keying interface operation via Menu item "020 R KEYER TYPE". (14) µTUNE Jack This covered 10-pin mini-DIN jack is used for control of the optional RF µTuning Kit. (15) CAT Jack This 9-pin serial DB-9 jack allows expternal computer control of the FTDX1200. Connect a serial cable here and to the RS-232C COM port on your personal computer (no external interface is requred).