351804-1 Rev. 100
COM5000-8 TECHNICAL MANUAL
51
f.
Observe the forward power reading on the wattmeter. Adjust VR5 clockwise until the power drops to
1750W - or if no power reduction is observed - adjust VR5 fully clockwise.
g.
While observing that the power output remains below
2750W
, reduce the attenuation on the
Variable Attenuator in small increments until the attenuation is zero. It may be necessary to re-
adjust VR5 to keep the power output below 3500W.
Note:
If VR5 is adjusted fully clockwise the power must remain below 2750W
h.
With zero attenuation on the variable attenuator, adjust VR5 for a forward power of 2750W.
i.
Un-
key the system. Remove the “clip lead” short from the junction of R118 and C93 to ground.
Replace the 2:1 VSWR Load with a 50 Ohm Load.
5.4.4
Power Supply Module Maintenance
The Power Supply module provides 50 VDC at 300 A maximum to the Transmitter system. The Power
Supply is a switch mode supply operating from a 3-PHASE AC Line input.
For Power Supply maintenance, refer to the Power Supply Interconnect wiring diagram shown in
Figure 5.4.4.
Adjustments:
There are no adjustments that can be made in the field. Substantial disassembly of the power supply is
required to adjust the output voltage. Return the power supply to the factory if the output voltage is out of
tolerance (outside the range of 48-52 VDC).