TB 9-6625-2077-24
(11) If measuring receiver does not indicate between the values specified in table 8,
perform b below.
Table 8. Deviation 10 kHz FM Meter Range
Test instrument
MODULATION
Measuring receiver indications
meter indications
(kHz)
kHz
Min
Max
10
8.5
11.5
(12) Set FM METER RANGE switch to 75 kHz and adjust MODULATION
LEVEL control for MODULATION meter indications listed in table 9. If peak deviation is
not within limits specified in table 9, perform b below.
Table 9. Deviation 75 kHz FM Meter Range
Test instrument
Measuring receiver
MODULATION
indications
meter indications
(kHz)
(kHz)
Min
Max
25
21.25
28.75
50
42.5
57.5
75
63.75
86.25
(13) Set MODULATION switch to FM 150 Hz and FM METER RANGE switch
to 75 KHz.
(14) Set RF OUTPUT switch to 0 dBm and adjust RF OUTPUT LEVEL control for
a 0 dBm indication on TI RF OUTPUT meter.
(15) Adjust MODULATION
LEVEL
control
for
a
75
kHz
indication
on
MODULATION meter.
(16) Set measuring receiver to measure FM deviation. Allow measuring receiver to
acquire signal.
(17) Set measuring receiver to measure modulation distortion.
Table 10. Distortion
Test instrument
Measuring receiver
MODULATION
distortion
switch setting
indication
(Hz)
(%)
150
<4
400
<4
1000
<4
(18) Measure FM distortion at 150 Hz. If measuring receiver distortion indication is
not less than 4.0 percent, perform b below.
(19) Repeat (14) through (17) above with MODULATION switch set at FM 400 Hz
and FM 1 KHz listed in table 10.
10
