4.8.1
Talk Back using IFR 3901/IFR 3902/IFR 3920
Prerequisites: Ensure that the handset and test equipment are configured the same as given in the
Transmitter Test before you start this test.
Procedure:
1 Press Call Mobile→Group Call.
2 Press TALKBACK.
3 Press PTT and speak into the microphone of the radio.
The last 3 sec of the speech frames is heard after PTT is released.
4 Press Test Sound to provide the 1 kHz signal to the radio speaker.
A 1 kHz tone is heard from the radio speaker for about 3 sec.
5 Press the Silence to mute the 1 kHz Audio Signal of the speaker.
6 Press Clear Down.
4.8.2
Talk Back using IFR 2968
Prerequisites: Ensure that handset and test equipment are configured the same as given in the
Transmitter Test before you start this test.
Procedure:
1 Press PTT and speak into the microphone of the radio.
The last 3 sec of the speech frames is heard after PTT is released.
2 Press Test Sound to provide the 1 kHz signal to the radio speaker.
A 1 kHz tone from the radio speaker is heard for about 3 sec.
3 Press the Silence to mute the 1 kHz Audio Signal of the speaker.
4 Press Clear Down. Check that the Cleardown Complete status appears on the IFR Manual
Test screen.
4.8.3
Call to Mobile
Procedure:
1 Press Call Mobile on the IFR.
2 Press Private.
NOTE: Select the type of call.
The handset beeps.
3 Press Abort Call.
4 Repeat step 1 through step 3 for Phone and Emergency calls.
MN002465A01-AN
Chapter 4 : Test Setup and Testing
41
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