12/5/07
888-2621-001
1-5
WARNING: Disconnect primary power prior to servicing.
Section I Operator Guide
Z3-48HD+
1.3
Transmitter Operation
a. Ensure all RF connections are tight, and that all control and AC service (mains)
connections are correct and secure using the correct voltage and frequency set-
tings.
b. Set the REMOTE/DISABLE switches on all transmitters to the REMOTE posi-
tion.
c. Start transmitter A (middle cabinet) by depressing the ON HI pushbutton on the
transmitter cabinet A. Operate transmitter at or near 100%. The ZD32 System
Controller FWD PWR should read near 25%. Press LOWER button until trans-
mitter cabinet A FWD PWR is near 20%. Turn off transmitter cabinet A by
depressing the OFF pushbutton.
d. Start transmitter B (right side) by depressing the ON HI pushbutton on the trans-
mitter cabinet B. Operate transmitter at or near 100%. The ZD32 System Control-
ler FWD PWR should again read near 25%. Press LOWER button until
transmitter cabinet B FWD PWR is 20%. Turn off transmitter cabinet B by
depressing the OFF pushbutton.
e. Start transmitter C (left side) by depressing the ON HI pushbutton on the trans-
mitter cabinet C. Operate transmitter at or near 100%. The Z3-48 System Con-
troller FWD PWR should read near 22%. Press LOWER button until transmitter
cabinet C FWD PWR is 20%. Turn off transmitter cabinet C by depressing the
OFF pushbutton.
f. Start combined transmitter operation by depressing the ON HI pushbutton switch
on the ZD32 System Controller. Both A & B transmitters should begin operation
and be producing RF power.
g. The ZD32 System Controller FWD PWR meter should be reading near 20%.
Select the REJ PWR meter position on the ZD32 System Controller and verify its
reading is near 0%. If this reading is more than 2-3%, this may be the result of
either amplitude or phase mismatch between the two combiner inputs. Adjust the
power level 2-3% out of just one transmitter, A or B. If this minimizes the reject
power to near zero, continue on to the next step. If power from each transmitter is
back to the same and more than 10% reject power exists, a phase mismatch may
be adjusted by changing the physical length of W901A or W901B in the drive
circuit. Some experimentation will be required. Add or remove BNC elbow adap-
tors or a very short length of cable (2-6 inches) to one or the other existing cables
at the drive splitter SP2 outputs located in cabinet A (middle). Any reject power
may be the result of a different connection from what was originally used at the
Harris test facility. Additionally, some phase adjustment can be accomplished on
the BoostPro GUI screen. See the BoostPro documentation for more details. Usu-
ally, no adjustment of amplitude or phase will be necessary.
h. Start the third cabinet C by depressing the ON HI pushbutton on the Z3-48 Sys-
tem Controller. All three transmitters should be operating and producing power.
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