TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TAF-550 Installation & Operating Instructions
TiL 96RE187 Rev D
3-4
TABLE 3.1
OPERATORS SWITCHES, CONTROLS AND INDICATORS - TAF-550 (Continued)
SWITCHES
CONTROLS &
INDICATORS
FUNCTIONAL DESCRIPTION
15
Tx ON AMBER
LED INDICATOR
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.
16 VOLUME
CONTROL
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.
17 VOLUME
CONTROL
Performs Chan/Freq and Special Feature Selection (Refer Table 3.2).
18 18
LIQUID
CRYSTAL
DISPLAY
A 5½ digit Liquid Crystal Display (LCD) displays the FREQUENCY/
CHANNEL that the transceiver is currently operating on. IN SCAN mode it
displays the current frequency scanned if RF signal is present.
19
LOUDSPEAKER
An 8-ohm internal speaker reproduces the receiver audio output. The audio
line is disconnected from the internal loudspeaker when the transceiver is
operated in Tx mode or when the SPEAKER/PHONE connector is in use.
20 SPEAKER
ON/OFF
SWITCH
Toggle switch will enable the TiL-91-DE internal speaker to be turned ON or
OFF.
TAF-550 Modular Chassis - Operators Switches, Controls and Indicators
21 MIC/PTT
CONNECTOR
A 3-pole connector functions as the Microphone/PTT Connector.
22 MICROPHONE
PTT
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.
23
PTT BUTTON
PTT button allows the operator to manually verify that the correct transmitter
is keying without using the microphone.
24 PHONE
CONNECTOR
A 3-pole connector provides interconnection to a headphone set. When in
use, the internal speakers may be switched off or left on and the VOLUME
control sets the audio level applied to the external speaker or headphone.
25 AC
ON/OFF
SWITCH
A 2-pole switch applies external AC power to the TAF-550 Modular Case
power supply.
26
AC POWER ON
LED INDICATOR
A GREEN LED indicates when AC power is applied to the unit and the AC
POWER SWITCH is set to ON. Also indicates that the TAF-550 Modular
Case power supply is functioning.
