Comtech-ef-data PCB-4000 Instrukcja Użytkownika Pobierz pdf (Strona 33)

PCB-4000 1+1 Phase Combiner Revision 2

Installation, Startup, and Troubleshooting Procedures MN/PCB4000.IOM

3–5

3.3 Initial System Setup and Verification

Thissectionassumesthatthesystemhasbeenassembled,thatallcableshavebeenconnected,

andthattheoutputportisterminatedinabroadbandhighpowerloadasdepictedintheFigure

1‐2 block diagram in Chapter 1. INTRODUCTION. If the system is “live” and you desire only to

verifyoperation,seeSect

ion3.5.



Youmayverfiyoverallsystemperformancebymeasuringtheratioofthetransmittedpowerto

thatofthepowerbeingdissipatedbythe“dummy”load.Adjustthegainandamplitudebalance

ifnecessary.



Followthesesteps:



Step Task

In the normal 1+1 phase combiner mode, the RED=X remote command setting should be set to “1”. You can

verify this by querying the system (see Chapter 5. SERIAL REMOTE CONTROL).

A. Attach a power meter to the Combined Output Power Test Coupler (Figure 3-1).

B. Apply a low-level signal at center frequency; making sure the output signal (at the system output port –not

the coupled port) will be at least 10 dB below Prated.

C. Measure the output power and include the coupler correction factor.

A. Attach a power meter to the Wasted (“Load”) Power Test Coupler (Figure 3-1).

B. Measure the power and include coupler correction factor.

If the Wasted (“Load”) power level is 15-20 dB below the transmitted power, the system is operating correctly.

If the ratio is below 10 dB, proceed to the gain and phase alignment

proc eduresthatfollowinthischapter.

A. Slowly increase the input power until the desired operating output power is achieved.

B. Again, verify the appropriate ratio of the transmitted to dissipated power.

6 If desired, repeat Steps 1 through 5 at different frequencies to verify proper full bandwidth operation.

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Comtech-ef-data PCB-4000 Instrukcja Użytkownika Strona 33