1-16
888-2621-001
12/5/07
WARNING: Disconnect primary power prior to servicing.
Section I Operator Guide
Z3-48HD+
•
Reverse the reflected power coupler on the appropriate combiner output by
loosening the hose clamps holding it to the transmission line and reattaching
it to the line in its reverse position. This must be done without disassembling
the coupler itself.
•
Use R45, RFL PWR SAMPL CAL, to set test point TP3 voltage to the target
voltage in tables above. Return the coupler to its original position.
•
Adjust R132, VSWR ZERO, to read 1.01 reflected power on the front panel
while the system is operating at full power and operating with no reflected
power. Removing the sample cable from the System Controller input J7 will
assure no reflected power reading.
•
Verify the VSWR metering circuit by operating system at full power and
forcing TP3 to read the target voltage from the tables with an external DC
voltage source connected to J7.
•
Verify that the VSWR reading is 1.50:1.
•
Set the system controller VSWR trip threshold with R158, SWR TRIP SET,
to trip at a VSWR of 1.30:1.
•
Remove external DC voltage source and reconnect sample input cable to J7
of System Controller.
To set other overloads and set points:
•
Turn the system output power (only that controlled by the particular System
Controller) to 90% and adjust R197, LO RF TRIP SET, until the low power
LED just turns on. Raise and lower the power above and below 90% and
verify the LED comes on at the 90% point, adjust as needed.
•
Using an external voltage source connected to J8 of the System Controller;
force the reject power meter to read 90% and set R161, REJ PWR
WARNING SET, until the reject warning LED comes on.
•
Set the reject power meter to read 104% with an external voltage source and
adjust R169, REJ PWR TRIP SET, until transmitters receive an OFF
command. If back-up modes of operation are used, the REJ PWR TRIP SET
can be set for up to the rating of the load. A ZD32 reject load typically has a
rating 5KW but for example, the FM+HD mode, 3.5KW is the most power
this load will absorb. If FM only was the backup mode, the trip set could be
at 5KW divided by 3.5KW or 143%. See test data sheets for the set point as
done in the factory.
•
Remove external DC voltage source and reconnect sample input cable to J8
of System Controller.
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