TECHNISONIC INDUSTRIES LIMITED
www.til.ca
A790 Operating Instructions
TiL 09RE409 Rev D
2-3
2.2.2 SIREN
Pressing this button will activate the PA system and play a siren sound until the SIREN
button is pressed again. The button will light up while this function is activated.
2.2.3 TRILL
Pressing this button will activate the PA system and play the trill sound until the TRILL
button is pressed again. The button will light up while this function is activated.
2.2.4 PLAY
Pressing this button will play the pre-recorded message through the PA system. The
message will play over and over again until the PLAY button is pressed again. The button is
lit while this function is active.
2.2.5 AUX IN
The auxiliary input is a 1/8” jack allowing an external audio source such as an MP3 player
to be played through the PA system or to be recorded on the A790’s message recorder.
2.2.6 PA
Pressing this button will activate the PA system and route audio from the auxiliary input to
the PA. Pressing the button again will switch off the auxiliary audio and deactivate the PA
system. The button will light up while this function is activated.
2.2.7 REC
Pressing this button once arms the message recorder causing the button to blink. If the
button is pressed again within 4 seconds, audio from the auxiliary input will be recorded
until the REC button is pressed a final time.
2.2.8 ON/OFF VOL
The volume knob adjusts the volume level of the audio going to the PA system only and
does not affect the sidetone level to the headset. The main power switch is incorporated
into the knob as well. If the A790 is installed in the standard configuration #1, switching off
the power automatically routes the headset, mic and PTT directly to the aircraft audio panel.
This will also happen if power to the unit is lost for some other reason.
2.3 OPERATION
Covered below are step by step instructions for each feature of the A790.
2.3.1 PA ANOUNCEMENT FROM THE HEADSET MIC
The MIC rotary switch has 3 positions:
•
Select the PA on the aircraft audio panel if in a standard installation (#2).
•
Select PA on the MIC rotary switch on the A790.
•
Key PTT and speak. Adjust volume if necessary. Note: Volume control only adjusts the
audio level to the PA, not what is heard in the headset.
•
Release PTT when done.
2.3.2 SIREN OR TRILL ANNUNCIATION
•
Press the SIREN or TRILL button as desired.
•
Press the previous button again to stop the annunciation.
Summary of Contents for A790
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