13.
Tighten the PA COUPLING control locking nut, just
enough to support the control.
14.
While the Driver is being keyed, rotate the PA COU-
PLING to a maximum of 275 mA at the PA PLATE
current meter. For fine adjustment of coupling, the
PA COUPLING control may be pushed or pulled.
15.
While keying the Driver, readjust the PA PLATE con-
trol for minimum reading at the PA PLATE current
meter.
16.
Repeat steps 11, 14 and 15 being sure not to exceed
275 mA at the PA PLATE current meter.
17.
Finger tighten the PA COUPLING control locking
nut.
18.
Turn the SCREEN adjust (R461) on the PA power
supply counterclockwise to obtain the licensed power
output or PA Plate Power input. Power levels with
typical PA plate current values are shown in Fig. 1.
(The current shown in Fig. 1 does not include screen
current. See note following step 9.
OUTLINE DIAGRAM
OUTLINE DIAGRAM
25-50 MHz, 300-WATT MASTR II
POWER AMPLIFIER MODELS 4EF4A1, 2 & 3
LBI-4938
LBI-4938
3
Summary of Contents for MASTR II 4EF4A1
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