12/5/07
888-2621-001
1-7
WARNING: Disconnect primary power prior to servicing.
Section I Operator Guide
Z3-48HD+
A REJ PWR reading of 100% will be one-fourth the total output power when the 3 dB
hybrid combiner is used, such as with the ZD32 System Controller. The REJ PWR
reading of 100% will be set for 2/3 the total output power from one transmitter when the
4.77dB hybrid combiner is used such as with the Z3-48 System Controller. Up to 2/3 of
the power from transmitter C or 1/3 of the power from the ZD32 could be present at the
4.77dB reject load. See Table 1-2 on page 1-8 for power results when one or two
transmitters are OFF. When a backup mode is used, consideration must be given to the
maximum power in the reject load allowed by the overload and the maximum power the
load is capable of. As a result of this consideration, some variations from the chart exist
and are noted in the Factory Test Data Sheet.
The following formula can be used for calculating expected power results at the antenna
port given different power level inputs as in the last two columns of Table 1-2:
where P1, P2, and P3 are the power levels from each transmitter.
Below is an Expected Power Results for Failure Conditions table.
ZD32 System Controller
FM+HD
14kW
As Indicated
3.5kW
HD only
7kW
As Indicated
1.75kW
FM only
20kW
As Indicated
5kW
Table 1-1 System Controller Average Power Metering
Pout
P1
P2
P3
+
+
(
)
2
3
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Summary of Contents for Z3-48HD+
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