TB 9-4931-488-24
Table 28. AM Flatness 332 MHz Option 004 Only.
Pulse generator
Measuring receiver
Level (V)
Frequency (Hz)
Min
Max
1
150
-0.1
+0.1
(16) Reduce all outputs to minimum.
b. Adjustments. No adjustments can be made.
18. FM Sensitivity, Accuracy, and Distortion
a. Performance Check
(1) Position controls as listed in (a) through (f) below:
(a) AM switch to OFF.
(b) FM k/MHz pushbutton pressed.
(c) PEAK DEVIATION switch to 320 kHz.
(d) FM control fully cw.
(e) RANGE MHz switch to 128 - 64.
(f) FM switch to AC.
(2) Connect equipment as shown in figure 7.
(3) Adjust FREQUENCY TUNE control for a FREQUENCY MHz display
indication of 64 MHz. Set RF OFF/ON switch to ON
(4) Press PRESET on measuring receiver. Set measuring receiver to measure FM
deviation.
(5) Set pulse generator for 1 kHz, 0.707 V rms output level. Press Out1 to ON. Set
the measuring receiver high-pass filter to 50 Hz, low-pass filter to 15 kHz, and use peak +
detector.
(6) Set PEAK DEVIATION switch to positions listed in table 29. If the measuring
receiver does not indicate as specified; perform b below.
(7) Repeat technique (3) and (6) above for the remaining settings in table 29.
