Technisonic Industries Limited TiL-91-DE/8.33, Инструкция по установке и эксплуатации

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3-3
3.4 Receiver Operation
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.