5.15.3
45 kW Transmitters
5.15.3.1
Visual Reject Loads
For 45 kW transmitters, each visual PA cabinet should be ener-
gized separately. Apply blanking and sync test signal to the
exciter. Using external metering at the combined output port,
adjust the combined power as indicated in the correct table below.
Use the table which corresponds to your system (M/NTSC,
B/PAL, or B/SECAM). Check for correct sync ratio at the PA
cabinet output. Be sure no “SET-UP” is used. Connect a high
impedance voltmeter to TP-3 on the slave controller and adjust
R-60 for 2.5 Volts. The display panel should indicate 7.5 kW on
the appropriate visual reject load display.
Repeat the above procedure for all three cabinets.
Reject Load Average Power Versus
PA Cabinet Peak Sync Power
M/NTSC Systems
Cabinets
Energized
Peak
Power
Reject
Load
1
Peak
Power
Reject
Load
2
Peak
Combined
Power
Average
Combined
Power
A
B
C
15
0
0
7.5 2.5
5.0
2.98
0
15
0
7.5 2.5
5.0
2.98
0
0
15
0
10.0
5.0
2.98
15
15
0
0
10.0
20.0
11.9
15
0
15 7.5 2.5
20.0
11.9
0
15
15 7.5 2.5
20.0
11.9
15
15
15
0
0
45.0
26.8
Peak Reject Load Power Versus
PA Cabinet Peak Sync Power
B/PAL and B/SECAM Systems
Cabinets
Energized
Peak
Power
Reject
Load
1
Peak
Power
Reject
Load
2
Peak
Combined
Power
Average
Combined
Power
A
B
C
15
0
0
7.5 2.5
5.0
2.84
0
15
0
7.5 2.5
5.0
2.84
0
0
15
0
10.0
5.0
2.84
15
15
0
0
10.0
20.0
11.4
15
0
15 7.5 2.5
20.0
11.4
0
15
15 7.5 2.5
20.0
11.4
15
15
15
0
0
45.0
25.6
5.15.3.2
Aural Reject Loads
For 45 kW transmitters with 10% aural, each aural RF chain
should be energized separately. Using external metering at the
combined output port, adjust the power to 1.125 kW. Connect a
high impedance voltmeter to TP-7 on the main controller and
adjust R-103 for 2.5 Volts. The display panel should now indicate
1.125 kW.
Repeat the above procedure for both cabinets.
For 45 kW transmitters with the 20% aural power option, the
calibration process is the same as it was for the visual reject loads,
except that different points are monitored and adjusted. The
power levels for 20% aural will be those indicated in table below.
The reject load monitoring points are located in the Aural PA
cabinets, with reject load 1 being monitored in the Aural PA “A”
cabinet and reject load 2 being monitored in the Aural PA “B”
cabinet. For calibrating reject load 1 power, the high impedance
voltmeter should be connected to TP-7 and R-77 should be
adjusted for 2.5 volts with one of the RF chains energized. For
calibrating reject load 2 power, the high impedance voltmeter
should be connected to TP-7 and R-77 should be adjusted for 2.5
volts with one of the RF chains energized.
Reject Load Power Versus
Aural RF Chain Power
Cabinets ON
Reject
Load
1
Reject
Load
2
Combined
Output
Power
A
B
C
3
0
0
1.50
0.50
1.00
0
3
0
1.50
0.50
1.00
0
0
3
0
2.00
1.00
3
3
0
0
2.00
4.00
3
0
3
1.50
0.50
4.00
0
3
3
1.50
0.50
4.00
3
3
3
0
0
9.00
5.15.4
60 kW Transmitters
5.15.4.1
Visual Reject Loads
For the 60 kW transmitter, the reject load associated with the
visual A & B cabinets may be calibrated by the same method
used for the visual reject load calibration process for the 30 kW
transmitter, except that R-78 in the aural PA “A” cabinet should
be adjusted for 2.5 Volts at TP-8. The front panel display page
indicating the reject load powers should indicate 7.5 kW. In like
manner, the reject load associated with the visual C & D cabinets
may also be adjusted for 7.5 kW on the display panel except that
the adjustments may be made in aural PA “B” cabinet.
The final reject load for the combined visual cabinets may be
calibrated by energizing visual PA cabinet “A” and “B” at 15 kW
(peak) each and adjust calibrate control R-95 on the main con-
troller for 2.5 Volts at TP-5. The display should then read 15 kW
on the appropriate visual meter page.
5.15.4.2
20% Aural Reject Loads
For the 60 kW transmitter with 20% aural power option, the reject
load associated with the aural A cabinet may be calibrated in the
same method as the 30 kW transmitter with the 20% aural option,
except that R-77 in the aural PA “A” cabinet should be adjusted
for 2.5 Volts at TP-8. The front panel display page indicating
reject load powers should indicate 1.5 kW. In like manner, the
reject load power associated with the aural “B” cabinet can be
calibrated using R-77 in the B cabinet slave.
5-10
888-2365-001
Rev. B: 1/11/1999
WARNING: Disconnect primary power prior to servicing.
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