Warning and Failure Indications
36 VHF Transceiver 0638.420-071 Issue 06 02/2021
at intervals of 3 s
• 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
• 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" 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
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