Harris Z3-48HD+, Technical Manual

Page: 27 / 38

12/5/07 888-2621-001 1-15
WARNING: Disconnect primary power prior to servicing.
Section I Operator Guide
Z3-48HD+
To set the forward power metering calibration, set the transmitters as follows (see Table
1-9 on page 1-15):
•
Set transmitter system (only those controlled by that particular System
Controller) to operate at 100% of normal operating power (not necessarily
full power capability).
•
Adjust R88, FWD PWR CAL, for 100% forward power reading on the front
panel. Some fluctuation of power will be noticed due to this type of detection
used for an IBOC signal and its peaks.
•
Set transmitter power to zero and adjust R90, FWD PWR METER ZERO,
for a reading of 0%.
•
Repeat previous steps as needed.
To set the reject power metering calibration, set the transmitters as follows:
•
For a particular System Controller, turn ON only the transmitters needed to
run maximum power into the Reject Load. See table 1-2 for configuration of
maximum Reject Load power.
•
Adjust R80, REJ PWR CAL, for a 100% reject power reading.
•
Turn the transmitter power output to zero and adjust R70, REJ PWR
METER ZERO, for a reading of 0%. Repeat as needed until both conditions
are met.
To set the reflected power meter calibration and overload:
•
Adjust each transmitter (only those controlled by that particular System
Controller) to operate at a forward power of half the stated reflected power
in tables above so that the system combined power is the stated reflected
power from the appropriate table. If total power output (100% forward
power) is different than stated in table, set transmitter for 0.04 times total
power out. Adjust target voltage proportionally.
Table 1-9 System Controller RF Metering Inputs
JACK PURPOSE LINEARIZER
TEST POINT
SAMPLE
CAL
METER
CAL
METER
ZERO
J6 System Forward Power TP2 R37 R88 R90
J7 System Reflected Power TP3 R45 N/A R132
J8 System Reject Load Power TP4 R78 R80 R70