Installing The Microphone Clip; Adjustment; Radio Programming; Interface Specification - Tait TM8000 Series Accessories Manual

4.1.2

Installing the Microphone Clip

4.2

Adjustment

4.3

Radio Programming

Table 4.1 DTMF microphone settings in the Programmable I/O form, Digital tab
Pin Direction
CH_GPIO1 Input
4.4

Interface Specification

48 TMAA02-02 DTMF Microphone
Install the microphone clip in the most convenient location for the radio
user. It must be within easy reach of the user, but in such a position that the
microphone PTT key cannot be inadvertently activated or jammed on.
Connect the microphone clip to the negative supply if hookswitch
operation is required.
Remove the DTMF microphone back cover and set the DTMF tone level
to approximately 80% deviation (±4kHz for wide bandwidth radios and
±2kHz for narrow bandwidth radios).
The following table shows the settings required for CH_GPIO1 in the
Programmable I/O form of the TM8000 Programming Application. This
setting means that when a key is pressed on the microphone, the DTMF
tones are fed into the radio's speaker at a reduced volume, giving the radio
user confidence that the tones are being transmitted. Refer to the online
help of the programming application for more information.
Label Action
None Send Mic Audio
To Spkr
The following table and diagram summarizes the signals used for the DTMF
microphone on the radio's microphone connector and shows the interface
between the DTMF microphone and the radio.
Table 4.2 DTMF microphone connector - pins and signals
Pin
1
2
3
4
5
6
7
8
Active Debounce
High None
Signal Colour
— —
13V8_SW red
— yellow
MIC_PTT black
MIC_AUD white
AGND blue
— —
MIC_GPIO1 green
TM8000 Mobile Radio Accessories Manual
March 2004 © Tait Electronics Limited
Signal State Mirrored To
None None
Description
not connected
power supply (switched)
not connected
PTT and hookswitch
audio from the microphone
analogue ground
not connected
mute out