TB 9-6625-2296-35
(14) Set measuring receiver to measure AM, with low pass filter of 15 kHz, high pass
filter of 50 Hz, and PEAK/2 detector selected.
Test instrument
Measuring receiver
Audio analyzer
RF
Modulation
Low
High
Distortion
frequency
rate
pass
pass
(%)
121.1 MHz
100 Hz
3 kHz
50 Hz
<1.5
121.1 MHz
1 kHz
3 kHz
300 Hz
<0.7
121.1 MHz
6 kHz
15 kHz
300 Hz
<1.5
121.1 MHz
7 kHz
15 kHz
300 Hz
<2.5
121.1 MHz
10 kHz
15 kHz
300 Hz
<2.5
900
kHz
1 kHz
3 kHz
300 Hz
<5.0
900
kHz
100 Hz
3 kHz
50 Hz
<5.0
900
kHz
10 kHz
15 kHz
300 Hz
<5.0
(15) Press Freq (F2) (Frequency Display Mode) and press DATA ENTRY keys to set
frequency to 750 kHz.
(16) Press A Freq (F1) (AF Frequency Mode) and press DATA ENTRY keys to set
AF FREQ to 100 Hz. Press DATA ENTRY ENTER keys.
(17) Press Mod (F5) (% Modulation Mode) and press DATA ENTRY keys to set
MODULATION to 30%. Press DATA ENTRY ENTER keys.
(18) If measurement receiver indication minus residual AM recorded in (5) above is
not within limits specified in table 17 for appropriate TI setting, perform b below.
(19) Repeat steps (15) through (18) for remaining settings listed in table 17.
Measuring receiver1
indications
Test instrument
Modulation
Percent
RF frequency
rate
modulation
Min
Max
750
kHz
100
Hz
30%
27.00
33.00
750
kHz
100
Hz
60%
54.0
66.0
750
kHz
100
Hz
90%
81.0
99.0
750
kHz
1
kHz
90%
81.0
99.0
750
kHz
1
kHz
60%
54.0
66.0
750
kHz
1
kHz
30%
27.00
33.00
750
kHz
10
kHz
30%
27.00
33.00
750
kHz
10
kHz
60%
54.0
66.0
750
kHz
10
kHz
90%
81.0
99.0
10
MHz
100
Hz
90%
85.5
94.5
10
MHz
100
Hz
60%
57.0
63.0
10
MHz
100
Hz
30%
28.50
31.50
10
MHz
1
kHz
30%
28.50
31.50
10
MHz
1
kHz
60%
57.0
63.0
10
MHz
1
kHz
90%
85.5
94.5
See footnote at end of table.
49