Specifications

3-14 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
Platinum VAX-C Series
3.2.4 System Calibration Screens
Refer to ’System Calibration’ screen shown in Figure 3-10. The Calibration screens
walks the user through the calibration procedure.
Figure 3-10 System Calibration Screen & Menu
Table 3-7 Xmtr Home>Config>Cal
Field Explanation
Factory
Fwd/Rfld
Factory Fwd/Rfld calibrates the system forward and reflected power meter. Factory
calibration is used as a reference calibration across the VHF band. The factory forward
calibration is performed at 205 MHz (center of VHF band). This is a two point calibration
process that saves calibration points at a low calibration point (approximately 10dB down
from the transmitter model power) and a high calibration point (transmitter model power).
Field Fwd/
Rfld
The Field Fwd/Rfld calibration is used as an additional correction to the factory calibrations.
This is useful when the factory forward calibration is being used as a reference calibration,
and the user wants to “touch up” the system forward power meter upon a change in frequency
or permanent power level (e.g. upon installation if licensed TPO is significantly less than
transmitter nameplate power rating). The field calibration process is a one point calibration
(at the current FWD POWER REFERENCE setting). This also allows the user to perform
the field calibration without changing the current output power level of the transmitter.
Start Cal The Start Cal soft button turns Green to indicate that calibration is active, and the adjust
output power window appears to walk the user through the low and high calibration points.
System Calibration is discussed in depth in Section 5.4 "Power Calibrations". Refer to that
section for the complete procedure