YAESU "PALMATE" FT-728 / YAESU FT-470
DOCUMENTATION
yaesu_ft470_user_manual.pdf
ft470_mods_01.pdf
MICROPHONE WIRING
PACKET RADIO / DATA INTERFACE
WIRING SIMILAR TO THE FT-530
Capacitor = 10µF
Resistor = 2 kΩ
MH-18A2B MICROPHONE SCHEMATICS/WIRING
MH-12A2B 1750HZ TONE MOD
yaesu_mh12a2b_1750hz_mod.pdf