SEARCH
MIXER PEAKING
Type 491
FINE RF CENTER FREQ
Centered
Display of nominal
INTENSITY
PHASE LOCK Controls
brightness
ON
INT REF FREQ
Adjusted for optimum
FOCUS AND ASTIGMATISM
display definition
Test Oscilloscope
As desired
SCALE ILLUM
.5 s
Time/Cm
Adjusted for a horizon-
POSITION (Horizontal and
.05
Volts/Cm
tally centered sweep on
Vertical)
AC
Input Coupling
the graticule baseline.
Int.
Triggering
2 ms
TIME/DIV
CAL
VARIABLE
Phase Lock Circuit
TRIGGER
SLOPE
+
Triggered
o
LEVEL
26. Adjust Avalanche Voltage
LINE
SOURCE
kHz/DIV
a. Equipment setup is given in Fig. 6-32.
DISPERSION RANGE
50 kHz/div
DISPERSION-COUPLED
b. Connect the Vertical Input of the test oscilloscope to
RESOLUTION
the 1 MHz MARKERS OUT connector ond turn the INT REF
All switches in off position
IF ATTENUATOR dB
FREQ control on.
Midrange (000)
IF CENTER FREQ
c. Adjust the test oscilloscope for a triggered display.
OFF
VIDEO FILTER
See Fig. 6-33B.
LIN
VERTICAL DISPLAY
Midrange
GAIN
d. Adjust the Avalanche Volts R1131. (Fig. 6-33), from a
fully ccw position, clockwise until the avalanche transistor is
ON
POWER
