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Pin No.

Pin Name

Function

I/O

1

SPO

Speaker output

O

 

 

 

 

2

COM

Common terminal

I/O

 

 

 

 

3

SS

Standby; when grounded, the transceiver enters TX

I

mode.

 

 

 

 

 

 

 

4

MKE

When connected with the common terminal, the amplifier

I/O

enters TX mode.

 

 

 

 

 

 

 

5

BRK

When connected with the common terminal, the amplifier

I/O

enters RX mode.

 

 

 

 

 

 

 

6

ALC

ALC input from the amplifier

I

 

 

 

 

7

RL

Approx. +12 V DC is output when in TX mode (10 mA

O

max.).

 

 

 

 

 

 

 

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Pin No.

Pin Name

Function

I/O

1

GND

Ground

—

 

 

 

 

2

TT

AT-300 control input/ output

I/O

 

 

 

 

3

GND

Ground

—

 

 

 

 

4

NC

No connection

—

 

 

 

 

5

TS

AT-300 control input/ output

I/O

 

 

 

 

6

14S

Power supply for EXT.AT Switched 13.8V.

O

 

 

 

 

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Pin No.

Pin Name

Function

I/O

1

MIC

MIC signal input

I

 

 

 

 

2

SS

MIC standby (PTT) control

I

 

 

 

 

3

MD

MIC Down control

I

 

 

 

 

4

MU

MIC UP control

I

 

 

 

 

5

8A

Switched 8V

O

 

 

 

 

6

NC

No connection

—

 

 

 

 

7

MSG

MIC GND

—

 

 

 

 

8

MCG

GND

—

 

 

 

 

66