TB 9-6625-2182-24
Table 14. Incidental FM
Measuring
Carrier
Modulation
Modulation
receiver
rate
%
<Hz
1 GHz
1 KHz
30
200
(6) Set measuring receiver to measure AM with a low pass filter of 15 kHz.
(7) Press TI ENTRY AM pushbutton and enter DATA percent of modulation for
each row in table 15. Using measuring receiver, measure the AM percent of modulation
indication will be within limits specified.
Table 15. AM accuracy at 1 kHz Modulation
Measuring receiver modulation
Test instrument
DATA
indications
percent of
(%)
modulation
Min
Max
30%
27.5
32.5
60%
56
64
90%
84.5
95.5
(8) Press TI ENTRY AM pushbutton and enter DATA percent of modulation for
each row in table 16. Using measuring receiver, measure the AM distortion; indication will
be within limits specified.
Table 16. AM Distortion at 1 kHz Modulation
Test instrument
Measuring receiver
DATA percent of
distortion indications
(<%)
modulation levels
30%
1.5
60%
3
90%
5
(9) Press RF OFF/ON pushbutton.
b. Adjustments. No adjustments can be made.
16. Frequency Modulation
a. Performance Check
(1) Disconnect OUTPUT MOD from INPUT AM and connect to INPUT FM/ M.
(2) Press TI pushbuttons as listed in (a) through (m) below.
INSTR PRESET.
(a)
ENTRY - FREQ.
(b)
DATA - 1 GHz.
(c)
ENTRY - AMPTD.
(d)
DATA - (+13 dBm).
(e)
ENTRY - FM.
(f)
DATA 20 kHz.
(g)