ACT-5X Exciter User Manual
Version 3.0 05/07/2015
Page 25 of 26
Note:
The acceptable range of feedback signal from port [RF_IN_A] or [RF_IN_B] is -30 dBm to 0
dBm, and the recommended range is from -15 dBm to -5 dBm.
Feedback Signal Connection Error
Alarm message
LCD:
“FEEDBACK LINK ERROR! Press Any key to Esc”
LED_ SysErr: Flashing (during the ADPC process)
Dry Loop:
0 V (SysErr Fault)
Cause: Feedback signal connection is interrupted, or signal level changes dramatically during the
ADPC process.
Solution: Cancel the ADPC function manually and then check the connection and the level of the
feedback signal. Start the ADPC function again after the problem is resolved.
ADPC Error
Alarm message
LCD:
“ADPC ERROR! Press Any key to Esc”
LED_ SysErr:
ON (during ADPC process)
Dry Loop:
0 V (SysErr Fault)
Cause: The measured IMD or SNR during ADPC process does not pass the pre-set threshold.
Solution: Cancel the ADPC function manually and then check the status of connection and entire
transmitting system. Start the ADPC function again after the problem is resolved.
5.5 Other Problems
Temperature
Alarm message
LCD:
TEMP HIGH
LED_ SysErr: ON
Dry Loop:
0 V (SysErr Fault)
Cause: The Temperature of the exciter/translator is too high.
Solution: Cool the exciter/translator.
No RF output
Alarm message
LCD:
None
LED_ RFON: Off
Dry Loop:
0 V (RF not Present)
Cause: When in Translator Mode, the translator could MUTE its RF output on loss of input RF
signal from port [TUNER_IN] or an unsuccessful demodulation by configuration. It’s designed
so to protect the broadcasting signal purity when one translator has a bad received signal or a
breakdown. And also RF output may have been turned off by front panel setting or via serial port
or WEB interface. Or if the exciter/translator itself has a breakdown, there would be no RF
output too.
