TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TSC-4100/4200.4300 92-SC
Installation & Operating Instructions
TiL 92RE125 Rev L
3-6
3.4.2
Receiver Operation (Local Mode)
To operate the transceiver in the receive mode, proceed as follows:
(1)
Ensure that the PRESS-TO-TALK switch on the microphone is NOT depressed, and
verify that the Tx ON amber LED is OFF.
(2)
Verify that the correct operating frequency is indicated on the front panel. Refer to
Section 4 for Channel/Frequency selection.
(3)
Adjust the SQUELCH control to suit local reception conditions. When the SQUELCH
control is rotated in the counter-clockwise direction, the SQUELCH indicator green LED
will switch to ON, indicating that the squelch circuit is connecting the demodulated audio
output to the VOLUME control.
Further adjustment of the SQUELCH control determines the squelch setting.
IMPORTANT NOTE
The dual conversion receiver’s squelch knob must be rotated significantly more clockwise
(4 o’clock position) to obtain the same squelch setting (3uV) as a single conversion
receiver’s squelch knob set to the 12 o’clock (straight up) position.
If the dual conversion receiver’s squelch knob is set to the 12 o’clock position, signals
with a level greater than 0.5uV will open the squelch. At most airports this will not be an
adequate level of squelch.
Recommended procedure:
The squelch taper on a dual conversion receiver looks as follows:
Squelch knob position
Squelch setting
12
o’clock
0.5uV
3
o’clock 1.2uV
3:30
position
2.5uV
4
o’clock 3uV
Fully
clockwise
9uV
It is recommended that the squelch be set to at least 2.5uV (3:30 knob position) at busy
airport locations. If ACARS signals are present on adjacent or nearby channels the
squelch level should be at least 3uV (4 o’clock) to prevent ACARS bleed through.
(4)
The VOLUME control can then be adjusted in a clockwise direction to increase the audio
level, or in a counter-clockwise direction to decrease the audio level which can be heard
on the internal loudspeaker.
NOTE
When an external loudspeaker or headset is
connected to the SPEAKER/PHONE jack of the
transceiver, the internal loudspeaker is
automatically disconnected. The VOLUME control
will now control the audio level applied to the
external loudspeaker or headset, as applicable.
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