5-16 888-2629-200 10/6/10
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Maxiva ULX COFDM Series
Figure 5-7
Typical Output Power Coupler
5.8.1.1 Calibrate Forward Total Power
a. Calibrate the averaging power meter following manufacturers instructions.
b. Set the meter offset to that printed on the coupler, or as supplied with a data sheet
included with the Factory Test Data.
c. Remove the sample cable from the external Total Forward directional coupler to
be calibrated (see
Figure 5-7, below).
d. Connect the power meter probe to the Total Forward directional coupler port.
e. Hold in power LOWER button for 20 seconds or navigate to Output screen and
set Cab. Ref. Pwr. to zero. Either of these steps will insure that the transmitter
does not produce large amounts of RF power at turn on.
f. Turn on and adjust the Maxiva COFDM transmitter to licensed nominal power as
programmed in the System Setup screen. Verify the power output with the power
meter attached to the forward port of the system output directional coupler.
g. Allow the transmitter to run for several minutes to give the amplifiers time to
warm up and stabliize.
h. Press the manual button on the TCU and hold it in for 5 seconds.
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