Filter
Top Products
Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 79
8.5.1 Output Power Adjustment
Each 1:2 Fixed Phase Combined SSPA System has been factory set for optimal Phase
Combining before shipment and should not need adjustment during installation and operation.
In the event that an amplifier is replaced, it may then be necessary to make additional phase
adjustment.
The two phase adjusters are located inside the Signal Box and are labeled PA1 and PA2. To
make adjustments, loosen the 7/16” locking nut at the bottom of the phase adjuster and
connect a power meter or spectrum analyzer to the crossguide coupler at the output of the
system after removing the detector and attenuator.
To adjust the phase combining, unmute all amplifiers and, using the FPRC-1200, set HPA 1
as the standby amplifier. With a CW signal applied to the input of the system, vary phase
adjuster (PA2) to peak the power reading on the power meter or spectrum analyzer or the
FPRC-1200 controller’s output power display.
With HPA 2 and 3 power combined, phase adjuster (PA2) will be used to maximize the output
power. Next, select HPA 2 as the standby. This combines HPA 1 and HPA 3. Use phase
adjuster (PA1) to optimize power.
It may be necessary to repeat the steps above to verify the power with all HPA
combinations. Choose the best compromise in power for all combinations so that if switch
over on fault does occur there is no noticeable increase or decrease in output power.
After phase combining is complete use the locking nut on each phase adjuster to secure the
adjustment knob so no accidental changes to the combining occur.
Before placing the system back in operation, replace the cover to the Signal Box.
Figure 8-11: 1:2 Fixed Phase Combined Compact Outdoor System