Cubic COM5000-8 User Manual

351804-1 Rev. 100
COM5000-8 TECHNICAL MANUAL
48
Setting System Controller potentiometers, Forward Power
a. Set up per figure 5.4.3.3. Command the Transmitter to operate on a frequency of 15 MHz, CW
mode. Set the variable attenuator for maximum attenuation. Key the Transmitter.
b. Using the variable attenuator, slowly increase the power. Observe the Transmitter power output
level on the wattmeter. Increase the power output to 4000W.
If it is not possible to obtain the 4000W there may be a number of reasons:
1. The ALC may be engaging - adjusting VR2 counter clockwise "releases" the ALC.
2. The Input Overdrive (ALC Splitter PCB) may be set wrong.
c. With 4000W output power:
1. Measure the DC voltage at the junction of R95 and L2 and verify that the voltage is 2.95 –
3.05 V.
2. Then adjust System Controller potentiometer VR4 for 2.00 VDC measured @ U31 pin 6.
3. Adjust VR8 for a System Controller front panel FWD PWR METER reading of 4000W.

Cubic COM5000-8 Specifications

General

Brand	Cubic
Model	COM5000-8
Category	Amplifier
Language	English