User's Manual

M7X and M7R Page 4-17 Installation

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Fig 4-12 Microphone/Headset/Maintenance Connector Pin Arrangement

Table 4-6 Microphone/Headset/Maintenance Connector Pin-Out

Pin Signal Characteristic Input or

Output

1 Headset A+ (non-boom side) Adjustable between 0 and 3 V pk-pk Output

2 Headset A ground 0 V -

3 PTT 0 V to PTT Input

4Ground 0V -

5 Headset B+ (boom side) Adjustable between 0 and 3 V pk-pk Output

6 Headset B ground 0 V -

7 Microphone +

Between 2 and 35 mV rms on the High

sensitivity setting to remain in ALC range

Between 8 and 140 mV rms on the Low

sensitivity setting to remain in ALC range

Use Active setting for a powered microphone.

Use the Passive setting for a non-powered

microphone

Input

8 Microphone ground 0 V -

9 USB D-

-1 to +4.6 V differential voltage Input/Output

10 USB D+

This illustration shows the radio’s chassis

mounted connector as seen looking from the

front of the radio.