Harris ATLAS ANALOGUE, Manual

Page: 132 / 134

4-18 888-2523-001 7/26/05
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
ATLAS Analogue
Figure 4-3 PA Module and Cabinet Phasing Screen
To access press: OUTPUT, OUTPUT SERVICE, PA REJ SERVICE
Remember that the default gain setting for the reject load detectors is Low. This means
that if all of the modules have the correct insertion phase, the reject load will show
minimum reject power on the PA Reject Service screen, and the ADC reading will be
very close to zero. However, at Low gain, this relates to a very coarse setting where the
phasing could be off quite a bit but very little reject power shows up on the screen due
to the lack of sensitivity of the detector.
To compensate for this each detector has two gain settings on the Phase Align screen,
Low and High. Once the reject power is minimized in the Low gain setting, the gain of
the detector can be increased to High to allow for better resolution and thus better phase
alignment of the PA Modules.
4.4.3.3 Normal Mode / Life Support Mode
The RF Controller operates in one of two modes, Normal and Life Support (micro
module failure). Normal Mode differs from Life Support mode only in that reporting
capability back to the Main Controller is lost in Life Support mode. All other fault
handling functions, including comparator thresholds, are maintained by the CPLD even
though the micro module is not functioning.
Detected RF sample
level, 0000 - 1023
PA Module Phase
Control Voltage
0000 - 1023
GOAL: To get the
detected RF
sample level
readings below
0030 (with
Gain set to LOW)
Module Group
select buttons
Reject Loads