5-28 888-2463-001 3/6/08
WARNING: Disconnect primary power prior to servicing.
Diamond Series™
Section 5 Maintenance and Alignments
c. Turn on the transmitter and very slowly increase the exciter output until the digi-
tal power meter reads 3 watts. If your sensor is rated at less than the normal 3.5W
then simply increase the driver output to within 0.5W of its maximum rating for
the calibration or use an attenuator.
d. Go to the Drive Chain screen on the GUI (Main Menu - Drive Chain)
e. Adjust R164 on the Driver Control Board until the GUI reading for that driver
matches the digital power meter reading.
f. Reduce the exciter power output to zero. Shut off the transmitter, reconnect the
driver and raise the transmitter power level back to you normal operating level.
5.8 Module Phasing
The phase adjustment of each PA Module is done on the GUI. Select the Module
Phasing screen 4.2.1 shown in Figure 5-10 (can be accessed directly from the Main
Menu). Determine which module needs adjustment by looking at the indicated reject
power for the modules. Reject levels should be less than 4%.
5.8.1 PA Module Auto Phasing
As of GUI revision 2.3.0, the Automatic phasing function is available. This procedure
can be done while on the air but it will take up to 15 minutes or more, depending on the
severity of the module phasing. To use the Auto Phasing:
STEP 1 First select the first module in the group of four which has the problem
(Module 1, 5, 9 or 13). For example, lets say module 7 was a little high.
You would select module 5. If the problem was module 16 you would
select module 13.
NOTE:
Step 1 is not actually required, but it has been found that the end result is usually
better if the first module in the problem group is selected.
STEP 2 Press the Auto Phase button. The next window will ask if you want to
normalize the modules to mid-range. This should NOT be done unless
you are having trouble getting the module phasing below 3%.
STEP 3 The controller will now go through a phasing routine which is looking at
the Total Reject power reading on the upper right side and doing its best
to minimize it.
STEP 4 Once it is done, if you are happy with the results press “Save Data”. If
not, press “Undo Changes” and try the auto phasing again or proceed
with the manual phasing procedure.
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