MICOM-3F/3T/3R HF-SSB Owner’s Guide
120
Connectors
MICOM-3F/3T Microphone Connector
The microphone connector is located on the lower part of the radio front panel. Table
3
lists the
functions of the microphone connector pins.
Table 3. MICOM-3F/3T Microphone Connector, Pin Functions
Pin Designation
Description
1
SWA+
Power output to the microphone
2
RXD
Serial communication line (input)
3
TXD
Serial communication line (output)
4 GND
Ground
line
5 MIC
AUDIO Input audio signals generated by the microphone (600
Ω
impedance; 100 mV tone is required for full output power).
6
PTT MIC
Activates transmission by short to ground.
7
MONITOR
Mutes the speaker before transmission is enabled (short
momentary to ground to open speaker).
8 AUDIO
OUT Receive audio output to earphone (600
Ω
, 300 mVRMS)
MICOM-3R Audio Connectors
The audio connectors are located on the lower left part of the radio front panel. An external speaker
and handset can be plugged into both connectors. Table 4 lists the functions of the audio connector
pins.
Table 4. MICOM-3R Audio Connectors, Pin Functions
Pin Designation
Description
A GND
Ground
line
B HANDSET
AUDIO
Receive audio output to external speaker
C
PTT MIC
Activates transmission by short to ground
D
MIC AUDIO
Input audio signals generated by the microphone
(600
Ω
impedance; 6 mV tone is required for full
output power)
E AUDIO
OUT Receive audio output (600
Ω
) to earphone
F
SWA+
Power output to microphone
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