PA-U1D-C-FA User Manual
ACT-PA-U1D-USR-DOC-V2.2, 09/25/2019
Page 11 of 22
Note:
1)
FWD-ADJ/REF-ADJ/REJT-ADJ: These are used to calibrate the forward power, reflected power
and rejected power meters. Calibration values may vary by channels. Every amplifier is calibrated
at the channel specified by order in the factory before shipment. If you would like to run the
amplifier at a different channel (within the allowed range of the amplifier) or to calibrate the
readings again for any reason, please contact the manufacturer for technical support. Otherwise,
inaccurate readings caused by the wrong calibration may cause false alarms (if readings are higher
than the actual power level), or lose the ability to protect the amplifier (if readings are lower than
the actual power level) and may cause damage to the amplifier and void the warranty.
2)
ATT: This is to set the value of the internal attenuator in the amplifier. The higher the value, the
more it attenuates the input level and therefore the output level. If the default “0” stands for no
attenuation at all, “4” stands for 1dB in attenuation, “8” stands for 2dB in attenuation, and so on.
We recommend keeping the value as default (0). Usually, the ATT value in the Status should
match the ATT setting in System Set Tap when the amplifier is running normally. If not, it is
possible that the amplifier has triggered some alarm and entered the auto-protection mode.
3)
RF-RESTART: if an amplifier is in the auto-protection mode, you can set RF-RESTART to ON to
clear all the alarm(s) and restart the amplifier. After RF-RESTART, please check again to see if the
alarm is gone and ATT is back to pre-set value. Sometimes you may need to clear more than once
to bring the amplifier back.
Important
: To be safe, before you run RF-RESTART to clear the alarm, please first lower the
exciter’s output 10dB down than its original settings, or set the exciter’s output to -20dBm, or set
the ATT to 60, to avoid over-drive the amplifier after it recovers from the auto-protection mode.
