Elecraft KSB2 - Manual (Page 18)

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Table 2. P1 Wiring for Selected Microphones (NC = no connection).
Elecraft MH2, MD2,
Proset-K2
Kenwood (MC-43,47,48,60),
Alinco EMS-11
Icom (HM-7,12,22,23,36)
Mic kit includes 8 jumper blocks
for use at P1, plus a 5.6-k resistor.
Install the jumpers first, then solder
the resistor from pin 1 to 6.
Note: Do not attempt do
disassemble the microphone. Do not connect pin 5 unless mic
has internal preamp. Touch-tone
ICs may be sensitive to stray RF.
CAUTION: 5V goes to pin 5, not
pin 6 (not straight across). Leave
pin 6 of the mic unconnected. Do not connect pin 2 unless mic
has internal preamp. Touch-tone
ICs may be sensitive to stray RF.
Resistor, AF to 5V: HM-7, 820
ohms; HM-12/22/23/36, 10 K
Signal Mic pin Signal Mic pin Signal Mic pin
AF 1
(resistor to pin 6)
AF 1 AF 1
(see resistor, above)
PTT 2 PTT 2 PTT 5
DN 3 DN 3 DN 3
UP 4 UP 4 UP NC
FUNC 5 FUNC NC FUNC NC
5V 6 5V 5 (see note above) 5V 2 (see note above)
GND 7 GND 7 GND 6
GND 8 GND 8 GND 7
Yaesu (MD-1, MH-1, 27, 31,
YM-35, MD-100)
Radio Shack (mic supplied
with HTX-100)
The MD-100 is slightly different
from the other mics in the list:
connect 5V to pin 2
Signal Mic pin Signal Mic pin Signal Mic pin
AF 8 AF 1 AF
PTT 6 PTT 2 PTT
DN 3 DN 3 DN
UP 1 UP 4 UP
FUNC NC FUNC NC FUNC
5V NC (MD-100: pin 2) 5V NC 5V
GND 2 (all but MD-100) GND 7 GND
GND 5, 7 GND 8 GND