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©2011 Broadcast Electronics
Procedure. To adjust reflected power null control R12, proceed as follows:
WARNING
DISCONNECT EXCITER PRIMARY POWER BEFORE
PROCEEDING.
WARNING
A. Disconnect the exciter primary power.
B. Remove the exciter top-cover and the access hole plug at the top and rear of the RF amplifier assembly
(refer to Figure 10-2).
C. Connect a 100 watt non-inductive test load to the exciter rear-panel RF OUTPUT receptacle.
D. Apply primary power and operate the exciter for 50 watts as indicated on the front panel meter.
E. Depress the front-panel RFL meter function switch.
WARNING
MAINTENANCE WITH POWER APPLIED IS ALWAYS
CONSDIERED HAZARDOUS AND THEREFORE CUATION
SHOULD BE OBSERVED. DO NOT TOUCH ANY
COMPONENTS WITHIN THE EXCITER WHEN POWER IS
APPLIED.
WARNING
WARNING
USE AN INSULATED TOOL FOR ADJUSTMENT.
WARNING
F. Refer to Figure 10-2 and adjust R12 for minimum reflected power as indicated on the front-panel meter.
WARNING
DISCONNECT THE PRIMARY POWER TO THE EXCITER
BEFORE PROCEEDING.
WARNING
G. Disconnect the exciter primary power.
H. Remove all test equipment and replace the access hole plug and exciter top-cover.
10.5.3
PA BIAS (R17).
PA BIAS control R17 on the RF amplifier circuit board adjusts the PA quiescent current. Potentiometer R17 is
adjusted as follows.
Procedure. To adjust PA bias control R17, proceed as follows:
Содержание FX-50
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Страница 20: ...8 2011 Broadcast Electronics Figure 2 1 FX 50 E REAR PANEL CONNECTIONS SHEET 1 OR 2 ...
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Страница 35: ...23 2011 Broadcast Electronics Figure 4 1 FX 50 E OVERALL SIMPLIFIED SCHEMATIC ...
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Страница 56: ...44 2011 Broadcast Electronics Figure 6 5 NO PA VOLTAGE TO THE RF AMPLIFIER ...
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Страница 162: ...150 2011 Broadcast Electronics Figure 14 2 EXCITER FRONT RAIL MOUNTING APPLICATIONS ...
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