Operating Instructions
Start-Up
100 Transceiver Family 620X DV14307.03 Issue 04 March 2016
If any action by the user is invalid, the whole display inverting for a short time.
Symbols shown on the Display
Intercom operation is active (triggered by VOX or external IC key)
Intercom operation via VOX is disabled
The transceiver is in transmit operation
The squelch function is active, weak RX signals suppressed.
Transceiver operates in scan mode
The transceiver performs a storage operation.
Battery below predefined low threshold
Inverted figures or letters on display ready to edit
Speaker on
3.3. Start-Up
Excessive pulses on the DC bus of the aircraft may cause damage on
electrical circuits of any installed instrument.
Do not switch ON the device during engine start or shutdown
• Turn "ON" the device by turning the volume knob clockwise.
• During PBIT (Power-On Built In Test) the display indicates the message "WAIT", the
software version of "Control Head" (CH) and the software version of "Core Module" (CM).
• If the PBIT has detected error(s),"FAILURE" appears on the display (for details see
chapter 3.13).
3.4. Receive and Transmit Mode
3.4.1. Receive Mode
If /PTT1 and /PTT2 (Push To Talk) inputs are inactive, the transceiver remains in receive mode.
In receive mode the headphone(s) outputs (if enabled) provide a mixed signal consisting of:
• Received signal from antenna,
• Intercom signal from intercom circuit one and two,
• Signal from auxiliary input.
In receive mode the speaker output (if enabled) provides a mixed signal consisting of:
• Received signal from antenna
• Signal from auxiliary input
The signal from the auxiliary input been muted under certain conditions (For details refer to "Intercom
Operation", page 109).
The signal from intercom can be attenuated, or muted, under certain conditions (For details refer to
"VOX & Speaker Operation", page 110).
3.4.2. Transmit Mode
If /PTT input is active (PTT=Push To Talk key is pressed) the transceiver switches to transmit mode.
Microphone(s) signals can modulate the transmitter.
• PTT 1 input activates transmission from microphone path 1
• PTT 2 input activates transmission from microphone path 2
• If BOTH MIKES are active / enabled in the configuration setup, each input (PTT 1 or 2)
activates the transmission from both microphone paths simultaneously.
The "TX" symbol in the left upper corner of the display indicates the device is in transmit mode.
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