Specifications

5-16 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Platinum VAX-C Series
STEP 9 Press the transmitter ON button while monitoring transmitter forward
power on the external power meter. Monitor reflected power on the LCD
screen. Slowly raise the power to the desired operational power level
and allow the transmitter to run for several minutes until output power is
stable.
STEP 10 Compare the external power meter value with the forward power
displayed on the LCD screen. If the values do not agree proceed with
calibration.
STEP 11 Use the LCD screen and control buttons to navigate to the calibration
menu SETUP> XMTR POWER SETTINGS> POWER CAL> FIELD
FWD/RFLD. Press Enter one time to highlight the menu then use the up/
down keys to select Field Fwd/Rfld.
STEP 12 Start the calibration procedure by pressing the Enter button again.
STEP 13 Follow the instructions on the LCD screen and use the power Raise/
Lower buttons to adjust the transmitter output to the desired level.When
a stable reading is attained on the power meter, select Save and then
press Enter.
NOTE:
It is helpful to check the RF DAC value displayed (in Hex) on the calibration
screen. In a system which is properly configured and operating correctly a DAC
value that exceeds A775 without reaching the desired power level indicates a
possible problem, verify the system is configured correctly.
STEP 14 Procedure complete.
5.4.2.1 Calibration Errors
If any components in the amplifier section are faulted during the calibration, the system
will consider it invalid and discard it. Replace any faulty components and perform the
calibration again.