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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.