User's Manual

CONNECTORS

CONNECTORS ON THE DESK CONSOLE

338 ENVOY™ TRANSCEIVER REFERENCE MANUAL

8-way connector

The 8-way connector is on the back panel of the desk console. It is a male Nisshin

NS1508 or equivalent. It is used to interface to an external foot-switched PTT,

headset, microphone or morse key.

Figure 77: Front view of the 8-way connector

Table 26: Pinouts of the 8-way connector

Pin no. Function Input/output Signal level

1 Ground 0 V

2 External microphone Input To suit electret

microphone

3 Bias for Electret Output +5 V via 3k2 resistor

4 PTT Input Active low, pull-up to

3.3 V

5 External earpiece Output 20 mW max into 16 

6 Ground 0 V

7 +5 V supply Output +5 V, 100 mA max

8 External morse key Input Active low, pull-up to

3.3 V