Harris Z3-48HD+, Техническое руководство

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12/5/07 888-2621-001 1-13
WARNING: Disconnect primary power prior to servicing.
Section I Operator Guide
Z3-48HD+
1.4 Alignments
NOTE:
All adjustments required have been made at the factory using calibrated test loads
and power meters to verify operating power levels. The following alignments are
to be performed only in the event of a field replacement involving any of these
components.
Three RF to DC sample transducers, in conjunction with RF directional couplers, are
used in each system, ZD32 and Z3-48, to monitor the RF power levels in that system.
The DC samples are routed through coaxial cables to the input jacks on the back of the
System Controllers.
The linearizer test point voltages are initially set using the tables below as determined
by the type of system with adjustments made using the corresponding sample
calibration pot (R37, R45 or R78). Variation of these voltages will exist depending on
desired high power output and linearity of circuit.
Table 1-3 ZD32 System Controller: FM+HD Mode
TEST
POINT
TARGET
VOLTAGE
SET UP CONDITION SAMPLE
CAL
TP2 0.275 Volts 14kW of system forward power R37
TP3 0.075 Volts 560 Watts of simulated reflected power R45
TP4 0.275 Volts 100% of reject power; 3.5kW R78
Table 1-4 ZD32 System Controller: HD Only Mode
TEST
POINT
TARGET
VOLTAGE
SET UP CONDITION SAMPLE
CAL
TP2 0.275 Volts 7kW of system forward power R37
TP3 0.075 Volts 280 Watts of simulated reflected power R45
TP4 0.275 Volts 100% of reject power; 1.75kW R78