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.
4.9.2
Talk Back Using IFR 2968
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 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.
4.9.3
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.
4.10
Digital Duplex Test (Tx) Using IFR 3901/IFR
3902/IFR 3920
Procedure:
1. On the radio, press Menu → Contact → Contact 1 → Send.
The following results are displayed on the Tx Measurements window.
68015000841-EL
Chapter 4: Test Setup and Testing
52
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