Kenwood TM-281A - Manual (Page 13)

6
1
ACCESSORY CONNECTIONS
E XTERNAL S PEAKER
If you plan to use an external speaker, choose a speaker
with an impedance of 8 Ω. The external speaker jack
accepts a 3.5 mm (1/8") mono (2-conductor) plug. We
recommend using the SP-50B speaker.
M ICROPHONE
For voice communications, connect a 600 Ω microphone
equipped with an 8-pin modular plug into the modular
socket on the front of the main unit. Press firmly on the
plug until the locking tab clicks.
Attach the supplied microphone hanger in an appropriate
location using the screws included in the screw set.
Microphone hanger
Microphone
hanger screw
(3 mm x 10 mm)
Keypad serial data
No Connection
MIC, 600
Ω impedance
GND (MIC)
PTT
GND
DC 8 V, 100 mA max
No Connection