Harris Ranger Series, Commissioning Manual

Page: 67 / 162

12/24/07 888-2685-001 3-11
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation and Adjustments
Ranger Commissioning Manual
3.6.3 PA Data
The PA Data screen in Figure 3-9 is accessed from the PA Meters screen in Figure 3-8.
It contains vital information about the operation of the PA module. The readings are
ADC or DAC counts in either 10 bit (0 - 1023) or 12 bit (0 - 4095). For detailed theory
on the PA Module refer to Section 4, Theory of Operation.
a.
Phase - This is an analog voltage from the Backplane Interface board which is
used to adjust the insertion phase of the module. In the CZ1000F this is used to
adjust the phase of PA Module 2 to match that of PA Module 1 (and to optimize
the PA Module combiner). The module controller converts the analog voltage
from the Backplane Interface board to a digital 10 bit word from 1 - 1023 with the
ideal being 512 or centered in the range. PA Module 1 receives a fixed voltage
which places it approximately in the center of the range (it is not critical), while
module 2 receives a variable voltage via R7 on the Backplane Interface to allow
for module phasing. This input controls the I and Q Vector outputs to the Phase
and Gain board in the module.
Figure 3-9 PA Data Screen
b.
I and Q Vectors -These are 12 bit DAC outputs from the module controller to the
Phase and Gain board in the module with a range of 0 - 4095. The phase voltage
from the Backplane Interface board adjusts these readings in opposite directions
to set the insertion phase through the module but they are also used to adjust the
module gain as part of the module AGC. These readings are considered OK as
long as they are not at the limit of the range. If either of these numbers are 0 or
4095, the PA Faults screen will register an AGC Unlock fault.
c.
Phase Preset - This is a fixed setting inside the module and should read approxi-
mately 512.