Specifications

5-10 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Platinum VAX-C Series
5.4 Power Calibrations
NOTE:
The following calibration procedures are for digital modes.
Factory FWD/Rfld calibration has been performed during factory test at 205 MHz
center frequency and the calibration is valid for the entire VHF band. Factory FWD/
Rfld calibration should be required only if a PA interface board, directional coupler, or
sample cable is replaced. Factory FWD/Rfld calibration is simple and can be done
whenever it is deemed necessary. Simply follow the instructions given in the calibration
menus.
Field Fwd/Rfld calibration can be performed as required at any operating frequency or
power level to insure precision. Follow the instructions given in the Field Fwd/Rfld
calibration menus.
!
CAUTION:
FORWARD AND REFLECTED POWER CALIBRATIONS SHOULD ONLY BE DONE
WHILE OPERATING THE TRANSMITTER INTO A KNOWN GOOD LOAD SUCH AS A
STATION DUMMY LOAD. BE CERTAIN THAT THE LOAD IS A CONFIRMED 50 OHMS
AND HAS THE CAPABILITY TO HANDLE THE POWER THAT WILL BE GENERATED
BY THE TRANSMITTER.
Power calibrations can be performed using the local LCD screen or the web browser
interface. Calibration performed via web browser interface require a user login and
password at the admin level. Transmitters ship from the factory with the default login
"admin" and the default password "admin" (do not include quotation marks in login or
password, login and passwords are case sensitive). If you change passwords be sure to
retain them in a secure location. You will not be able to make changes to transmitter
settings via web browser without a valid password.
Harris recommends the Firefox web browser but Chrome or IE8 (or greater) can be
used as well.
Refer to Figure 3-9 on page 3-12. In the ’System Configuration’ screen select soft key
’Cal’. If logged in via web browser, the following screen (in HTML format) will be
displayed to facilitate Calibration.