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indicates the TX is ON. When it is RED, it indicates the TX is OFF.



FWD: the Forward Power Meter. Touching the white display box of FWD will toggle its display

units between "dBm" and "W".



REFL: the Reflected Power Meter. Touching the white display box of REFL will toggle its

display units between "dBm" and "W".



VSWR: the Voltage Standing Wave Ratio.



Status Bar: During normal operation, the default status is "RUNNING OK". If there is an alarm, the

alarm will show up in the Status Bar of each screen.



Block Diagram: Press the "Exc A/B" graphic to navigate to the Dual Exciters Switching screen

(shown below). This screen shows which exciter is currently on-air (highlighted in GREEN) and

allows the user to manually change the on-air exciter.

3.2.2. A/B Exciter Icon Screen

Dual Exciters - Switching Screen: Pressing the "Exc A/B" icon will bring you to the Dual Exciters

Switching Screen, a shown below.

Manual Exciter Switchover: As shown above, Exciter A's status is in "GREEN", indicating that Exciter A

is the current on-air exciter, while Exciter B is standby. Pressing the "Exciter A" or "Exciter B" button on

this screen will cause a manual switchover between exciters if the PA is "linked" to both exciters. (Note: In

a dual exciter configuration, both exciters are on at the same time, producing an RF output signal a the

same time, and the PA is considered "linked" with an exciter when the PA detects an RF output present

from the exciter as monitored).

Auto Exciter Switchover: In a Dual Drive configuration, the PA is set to automatically switch to the

standby exciter in the event a problem occurs with the on-air exciter. The PA will not automatically switch

back to the original Exciter as long as the standby Exciter is operating properly. However, the PA will

ACT-PA-U2D-USR-DOC-V2.2, 09/25/2019

PA-U2D-C-FA User Manual

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