Specifications

5-14 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Platinum VAX-C Series
FACTORY FWD/RFLD. Press Enter one time to highlight the menu
then use the up/down keys to select Factory Fwd/Rfld.
STEP 11 Start the calibration procedure by pressing the Enter button again.
STEP 12 Follow the instructions on the LCD screen and use the power Raise/
Lower buttons to adjust the transmitter output to the desired low
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 860 without reaching the desired low power level indicates a
possible problem, verify the system is configured correctly.
STEP 13 Follow the instructions on the screen and use the Raise/Lower buttons to
adjust the transmitter output to the desired high 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 A73 without reaching the desired high power level indicates a
possible problem, verify the system is configured correctly.
STEP 14 Procedure complete.
5.4.1.1 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.
5.4.2 Field Fwd/Rfld Calibration
Field Fwd/Rfld calibration can be performed any time greater accuracy is required at
any specific frequency or power level. Field calibration is a one point calibration
performed at a customer specified power level and frequency. The forward power
reference sample is taken from the internal directional coupler and regulates the power
of the transmitter output before any filter losses. Reflected power is automatically
calculated as the calibration routine is processed. Calibration data is stored on a PA
interface board EEPROM.