TB 9-6625-2004-35
Table 4. RF Oscillator
Test instrument
Signal generator
FREQUENCY
FREQUENCY-
Initial
Final frequency indications
RANGE-MC
MC
frequency settings
(MHz)
switch settings
dial settings
(MHz)
Min
Max
20-55
35
35
31.5
38.5
20-55
50
50
45
55
55-120
60
60
54
66
55-120
87.5
87.5
78.75
96.25
55-120
115
115
103.5
126.5
120-250
130
130
117
143
120-250
185
185
166.5
203.5
120-250
240
240
216
264
250-500
260
260
234
286
250-500
375
375
337.5
412.5
250-500
475
475
427.5
522.5
500-1000
550
550
495
605
500-1000
750
750
675
825
500-1000
900
900
810
990
b. Adjustments
(1) Set FREQUENCY RANGE-MC switch to 20-55.
(2) Set signal generator frequency to 35 MHz.
(3) Loosen setscrew that holds FREQUENCY-MC dial to oscillator shaft and adjust
oscillator shaft for a 0 indication on CARRIER SHIFT meter.
(4) Adjust FREQUENCY-MC dial to 35 MHz and tighten setscrew.
9. Input Sensitivity
a. Performance Check
(1) Set FREQUENCY RANGE-MC switch to 250-500 and adjust FREQUENCY-
MC dial to 400 using TUNING knob.
(2) Set signal generator for a 400 MHz, 5 mV output.
(3) Adjust TUNING knob for maximum indication on LIMITING meter while
maintaining 5 mV level. If LIMITING meter pointer is not within the black area, perform
b below.
is at beginning edge of black area (R).
