Installation manual

INSTALLATION MTM700/MTM800 Mobile Terminal / Installation Manual 73
1) The impedance of a connected speaker should be > 20 ohms
2) The impedance of a connected earpiece should be > 2200 ohms
4 BROWN Ground Ground
5 GREY Speaker - Negative output of the radio's audio PA. Speaker + and Speaker - are
used to connect a control head speaker or monitor speaker. 1)
6 BLACK Internal Mic Audio This input connects to the microphone connector on the control head
and depends on radio programming. This microphone signal is
independent of the microphone signal on the accessory connector. The
nominal input level is 80 mV. The DC impedance is 660 ohms and the
AC impedance is 560 ohms.
7 YELLOW Bus + This is used for communication between the radio and a standard
control head.
8 GREEN Speaker + Positive output of the radio's audio PA. (See Speaker -) 1)
9 RED Handset Audio This is a low power audio output primarily intended for a connected
Handset. The DC level is 4.6V and the AC level depends on the volume
setting. 2)
10 PINK Expansion PTT When this input is used to key up the transmitter, the Internal Mic Audio
input ( see Internal Mic Audio) is selected.
Table 16 Colour Assignment of the Cable from Expansion Head -to- Helmet, external PTT, etc.
Pin Colour Function Description