Instruction manual

TM 11-6625-3017-14
Table 4.1. Test Equipment Required.
Item Type Minimum specification Recommended model
a A. M. signal Output: 100 mV across 50 Q TF 2002B
generator A. M.: 80%
Envelope distortion: 1% at 50% mod.
b F. M. signal Deviation: 4 to 250 kHz TF 2008
generator Mod. freq.: 0 to 200 kHz
Spurious a. m.: 1%
c F. M. signal Output: 200 mV across 50 n TF 1066B/6
generator Deviation: 4 to 250 kHz (Mod. freq.: 40 Hz -
Mod. freq.: 0 to 200 kHz 100 kHz)
d Electronic Sensitivity: 10 mV Hewlett-Packard
voltmeter r. m. s. or average reading HP 3406
dB calibration
e Frequency Frequency: 20 kHz to 1.5 MHz Hewlett-Packard HP 5245L
meter Sensitivity: 10 mV with HP 5261A
f L. F. oscillator Frequency: 800 Hz to 56 kHz Hewlett-Packard
Distortion: 0.5% HP 209A
g Spectrum Resolution: 60 dB at 50 Hz TF 2370
h Oscilloscope L. F. general purpose Hewlett-Packard HP 1700B
i Selective Frequency: 1.4 to 1.6 MHz Siemens
level meter Pegelmesser
j Crystal Any available frequency with range of
oscillator 10 to 500 MHz, with output between
20 and 100 mV.
k Low-pass Cut-off frequency: 15 kHz See Sect. 2.9
filter
l Multimeter To measure resistance, Hewlett-Packard
40 to 60
Ω
HP410A
m Amplitude A. M. depth: 80% TM 9897A
modulator
(3) On the modulation meter, turn the oscillator RANGE
switch and TUNE control to suit the r. f. input
frequency, the Function switch to TUNE
OSCILLATOR AND ADJUST LEVEL and the
LEVEL control fully clockwise.
(4) Tune for peak meter deflection and then adjust the
signal generator output until the
meter deflection is at the bottom of the black arc.
(5) Check that the signal generator output, as indicated
on the voltmeter, is within the figure given for r. f.
input sensitivity in Sect. 1.2 - Data Summary. If not,
check the harmonic generator alignment as in
Sect. 5.4.5 and/or the output of the oscillator.
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