351804-1 Rev. 100
COM5000-8 TECHNICAL MANUAL
50
≤ 5 feet coax
d.
Key the system and observe the Wattmeter reading. The forward power should be close to 2000W
and the reflected power close to 200W.
By varying the RF drive level with the variable attenuator, adjust the reflected power read on the
Watt-Meter for 200W - the forward power reading should be close to 2000W.
If it is not possible to obtain the 200W there may be a number of reasons:
1. The VSWR ALC may be engaging too early (VR5)
2. Actual fault conditions
e.
With 200W reflected power:
Measure the DC voltage at the junction of R96 and L1 and verify that the voltage is 1.27 - 1.31 V. If
not, there may be a problem in the Combiner module.
Then, if necessary:
1.
Adjust VR3 for 1.16 VDC @ U31 pin 11
2.
Adjust VR9 for a System Controller front panel REV PWR METER reading of 200W
Wattmeter
4381
50 Ohm, 4 kW Load/
Attenuator w.
Blower
8929-300
50 Ohm Load,
10 kW
Bird 8931
T
Transmitter
Directional
Coupler
J3
J4
Содержание COM5000-8
Страница 6: ...351804 1 Rev 100 COM5000 8 TECHNICAL MANUAL iv FRONT VIEW OF TRANSMITTER ...
Страница 22: ...351804 1 Rev 100 COM5000 8 TECHNICAL MANUAL 12 Figure 3 2 1 Power Supply Module Front Panel ...
Страница 24: ...351804 1 Rev 100 COM5000 8 TECHNICAL MANUAL 14 Figure 3 2 2 PA Module Front Panel ...
Страница 25: ...351804 1 Rev 100 COM5000 8 TECHNICAL MANUAL 15 Figure 3 2 3 System Controller Module Front Panel ...
Страница 43: ...351804 1 Rev 100 COM5000 8 TECHNICAL MANUAL 33 Figure 5 4 1A 1 25kW PA Module Subassembly Location ...
Страница 63: ...351804 1 Rev 100 COM5000 8 TECHNICAL MANUAL 53 Figure 5 1 Transmitter Interconnect Wiring Diagram ...
Страница 64: ...351804 1 Rev 100 COM5000 8 TECHNICAL MANUAL 54 Figure 5 4 1 PA Module Interconnect Wiring Diagram ...
Страница 65: ...351804 1 Rev 100 COM5000 8 TECHNICAL MANUAL 55 Figure 5 4 3 System Controller Interconnect Wiring Diagram ...
Страница 66: ...351804 1 Rev 100 COM5000 8 TECHNICAL MANUAL 56 Figure 5 4 4 Power Supply Interconnect Wiring Diagram ...