Kenwood TM-732A Instruction Manual page 54

This transceiver can be controlled by the DTMF
tones generated by the DTMF microphone.
(The MC-45DM microphone is optional in some
market areas.)
@ Function selection
Hold down the F key, then press the C. SEL key.
The S/RF indicator flashes.
@ Operation
1. Connect the DTMF microphone.
2. The functions that can be controlled by the
microphone and the associated key are listed in
the accompanying chart.
54
MC-45DM
MIC1 key (F key) operation