Comtech-ef-data PCB-4000 Instrukcja Użytkownika Pobierz pdf (Strona 36)

PCB-4000 1+1 Phase Combiner Revision 2

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

3–8

3.5 Amplitude Alignment (as necessary)

Evenifthedifferenceofeachindividua lSSPApathisgreaterthan±1dB,amplitudeadjustment

maynotbenecessarytomeetallparametersofSection3.3.However,iftheseparametershave

notbeenmet,thenfinetuningadjustmentisadvisable.

Ifthesystemistobe usedinanarrowfrequencyrange,youmayalsowishto

optimizethegainbalanceoverthisnarrowrange.

Followthesesteps:



Step Task

1 If Steps 1 through 6 in Section 3.4 have not been completed, perform them now.

Again, insure the input signal is at center frequency and that the output power level is approximately Prated

-10 dB.

Alternately toggle between remote commands BYP=1 and BYP=2 to measure the gains of each SSPA

path. Note which path has the greater amount of gain.

Use the AOF (user amplitude offset) remote command/query to equalize the gain between the 2 paths. For

example, if SSPA 1 has 2 dB excess gain:

A. Query the offset of SSPA 1 using remote query AOF?1.

The unit should respond with a gain offset ranging between 0 and 6. Record this value, then add

2 dB. For this example, assume SSPA 1 responded with 1 dB. Adding 2 dB of required additional

offset to the existing 1 dB of offset results in 3 dB of required offset.

B. Now send remote command AOF=1,3.00.

Proceed to the Phase Alignment procedure (Section 3.6) if anything has been changed or altered that may

affect the phase alignment. Otherwise, verify proper operation via the LED Indicators as detailed in Section

3.3.1.

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Comtech-ef-data PCB-4000 Instrukcja Użytkownika Strona 36