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TABLE 3.1 OPERATORS SWITCHES, CONTROLS AND INDICATORS
SWITCHES
CONTROLS &
INDICATORS
1
POWER
ON/OFF
SWITCH
2
POWER ON
LED
INDICATOR
3
FUSE
4
FUSE BLOWN
RED LED
INDICATOR
5
SQUELCH
CONTROL
6
SQUELCH
INDICATOR
GREEN LED
7
TX ON
AMBER LED
INDICATOR
8
VOLUME
CONTROL
9
MIC/PTT
CONNECTOR
10
MICROPHONE
PTT
11
KEYPAD
TMS-150 91-DE Installation & Operating Instructions
TECHNISONIC INDUSTRIES LIMITED
www.til.ca
FUNCTIONAL DESCRIPTION
A toggle switch applies the 13.7 volts nominal power supply to the
transceiver. The transceiver is switched to ON in the toggle UP position and
is switched OFF in the toggle DOWN position.
A GREEN LED indicates when the POWER ON/OFF switch is set to ON
and voltage is applied to the transceiver.
A 5 Amp FUSE protects the 13.7 volts dc nominal power supply line.
A RED LED indicates when the 5 Amp fuse is blown, and External DC
Battery or AC power is present.
A linear potentiometer determines the squelch threshold level. When the
SQUELCH CONTROL is rotated in the counter clockwise direction, the
SQUELCH GREEN LED indicates that the squelch is connecting
demodulated audio to the VOLUME control.
A GREEN LED indicates the squelch circuit is connecting demodulated
audio signal to the VOLUME control.
An AMBER LED indicates when the transceiver is keyed by the microphone
PRESS TO TALK (PTT) switch or remote land line, and the transceiver is
operated in the Tx mode. The Tx ON AMBER LED switches OFF, when the
transceiver is operated in the receive mode.
A logarithmic potentiometer determines the audio level applied to the
internal speaker when the transceiver is operated in the receive mode.
When the SPEAKER/PHONE connector is in use the internal loudspeaker is
disconnected and the VOLUME CONTROL sets the audio level applied to
the external speaker or headphone.
A 5 pin connector functions as Microphone/PTT and Test Connector.
Pin 1 - PTT Signal Line
Pin 2 - Microphone Signal Ground
Pin 3 - Microphone Signal and Microphone DC Supply Line
Pin 4 - AGC test voltage
Pin 5 - Squelch test voltage
PRESS TO TALK (PTT) switch determines transceiver operating mode.
When the PTT switch is pressed, the transceiver operates in Tx mode.
When the PTT switch is released, the transceiver operates in Rx mode.
Performs Chan/Freq and Special Feature Selection (Refer Table 3.2).
3-3
TiL 94RE146 Rev E
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