Fixed Phase Combined Systems | Paradise 205486 REV F manual

8.3.5 Adjusting the Phase Combining

The system is phase adjusted for optimum performance across the frequency band at the factory, and no adjustments are typically needed except in the event that a SSPA has been replaced.

The SSPAs are manufactured to a delay specification, but an adjustment may be necessary to achieve the best operation in the system. After the new SSPA has been placed in the system, apply power to the system and enable both amplifiers. Apply a CW signal source to the input of the system and monitor the output power on the FPRC-1100 LCD screen.

Measure the power out of the system with a single CW carrier (mid-band) applied to the input. Remove the cover from the Signal Box and loosen the locking nut on the phase adjuster (7/16”) and slowly rotate the knob clockwise. Continue to rotate the knob until the output power is peaked.

For optimum performance across the entire frequency range of the SSPA system, choose another frequency near each band edge and repeat the steps above. It may be necessary to find the best compromise in output power for broadband use.

The BUCs are outside the phase combined loop. Therefore, replacing a BUC will not impact the phase combining of the system, and no adjustment of the phase shifter is necessary.

Securely fasten the cover back on to the Signal Box.

8.4 1:2 Fixed Phase Combined Systems

The 1:2 Fixed Phase Combined Redundant System is a popular system architecture that enables Solid State Power Amplifiers to achieve higher output power levels while building in full-power redundancy. The basic system topology is similar to a 1:2 redundant system and is shown in Figure 8-7.

Figure 8-7: Block Diagram, 1:2 Fixed Phase Combined System

Operations Manual, HPA2, Compact Outdoor SSPA

205486 REV F

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Paradise 205486 REV F manual Fixed Phase Combined Systems, Adjusting the Phase Combining

Models: 205486 REV F