TB 9-6625-2296-35
(10) Press Dev (F5) (Deviation Mode) and press DATA ENTRY keys to set
DEVIATION to 10 kHz, the FIELD SELECT arrow keys to AF FREQ, and DATA
ENTRY keys to set AF FREQ to 1 kHz.
(11) Audio analyzer indication will be less than specified in table 19 for current
TI setting.
(12) Repeat (10) and (11) for remaining settings listed in table 19.
(13) Repeat (9) through (12) for a RF frequency mode setting of 900 MHz.
Test instrument
Measuring receiver
Audio analyzer
Modulation
Deviation
Low
High
distortion
rate
setting
pass
pass
(%)
1 kHz
10 kHz
3 kHz
300 Hz
<.70
30
Hz
10
kHz
3
kHz
<20
Hz
<1.0
10
kHz
10
kHz
15
kHz
300
Hz
<1.0
11
kHz
10
kHz
15
kHz
300
Hz
<2.0
(14) Set measuring receiver low pass filter to 3 kHz, high pass filter to <20 Hz and
select PEAK/2 detector.
(15) Press Freq (F2) (RF Frequency Mode) and press DATA ENTRY keys to set
frequency to 750 kHz.
(16) Press A Freq (F1) (Audio Frequency Mode) and press DATA ENTRY keys to
set AF FREQ to 30 Hz. Press DATA ENTRY ENTER key.
(17) Press Dev (F5) (Deviation Mode) and press DATA ENTRY keys to set
DEVIATION to .100 kHz.
NOTE
If widely fluctuating readings are observed, use slow peak
detector mode and de-emphasis filters of measuring receiver as
required.
(18) If measuring receiver indication, minus residual FM recorded in (5) above, is not
within limits specified in table 20 for appropriate TI setting, perform b below.
(19) Repeat (14) through (18) for remaining settings listed in table 20.
Measuring receiver1
indications
Test instrument
RF
Modulation
Deviation
frequency
rate
modulation
Min
Max
750 kHz
30 Hz
100 Hz
.090
.110
750 kHz
30 Hz
10 kHz
9.50
10.50
750 kHz
30 Hz
25 kHz
22.50
27.50
750 kHz
1 kHz
100 Hz
.090
.110
See footnote at end of table.
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