Operating Instructions
Becker Avionics
Warning and Failure Indications
36
VHF Transceiver 0638.420-071 Issue 06 02/2021
Display Contents Description
at intervals of 3 s
"LOW BATTERY":
•
The supply voltage of the transceiver is less than the
threshold adjusted in the configuration setup.
•
The device is operable but it can have a decreased
performance depending on supply voltage.
Possible cause:
•
Accumulator capacity problems
•
Power interrupts.
•
General power supply problems.
•
Adjustment for low battery threshold too high.
at intervals of 3 s
"STUCK PTT":
•
The transmit mode is automatically terminated (return to
receive mode) after 120 s of continuous transmitting.
•
The transceiver goes back to receive mode also if the
PTT line is still active (GND).
Possible cause:
•
Transmission continues more than 120 seconds.
Frequent overriding can decrease the MTBF.
•
PTT-key is stuck.
•
PTT line permanently grounded (short circuit in
installation).
Notice: For the start of a new transmission it is necessary to set the
/PTT line inactive (open).
at intervals of 3 s
"TX HOT":
•
"TX HOT" is shown if the internal device temperature is
> +90 °C.
•
Transceiver is still operable. The performance of
transmitter is decreased.
Possible cause:
•
Very high environmental temperature, long
transmissions times and airflow conditions are not
sufficient.
LOW BATTERY
IC
118.005
STUCK PTT
IC
118.005
TX HOT
IC
118.005
