TB 9-6625-152-24
(7) Press Tx TEST, [Tx Freq], 1, 0, 0, MHz keys.
(8) Set measuring receiver high pass filter to 300 Hz and low pass filter to 3 kHz.
(9) Set signal generator for a 100 MHz, 6 dBm output with AM modulation of 5%
depth at a 1 kHz modulation rate.
(10) Adjust signal generator AM depth for first value listed in AM Depth column of
table 20 as indicated on measuring receiver. If TI displayed AM LEVEL indication is not
within limits specified in first row of table 21 for specific model, perform b below.
(11) Repeat technique of (9) and (10) above for signal generator outputs and TI
settings listed in table 21. If TI displayed AM LEVEL indications are not within limits
specified in table 21 for specific model, perform b below.
Table 21. AM Modulation Analyzer 1 kHz Rate.
Signal generator
Test instrument
Output
Indication limits
Mod rate
AM Depth
Model 2947 (%)
Model 2947A (%)
(MHz)
(MHz)
(kHz)
(%)
100
1
5
100
0 to 14
3 to 8
100
1
20
100
11 to 29
18 to 22
100
1
50
100
14 to 59
46 to 54
100
1
80
100
71 to 89
75 to 85
100
1
95
100
86 to 100
89 to 100
(12) Set TI as listed in (a) through (e) below:
(a) Press Tx TEST.
(b) Press [Scope/Bar] key until LARGE SCOPE is selected.
(c) Press Tx TEST, [Scope/Bar], [Scope/Bar] and
,
keys to select
10% range.
(d) Press Tx TEST, [Scope/Bar], [Scope/Bar] and
keys to select
500 μs/div.
(e) Press Tx TEST, [Tx Freq], 1, 0, 0, MHz keys.
(13) Set signal generator for a 100 MHz, 6 dBm output with AM modulation of 58.5%
depth at a 1 kHz modulation rate. If TI AM LEVEL indication is not between 54 and 66%,
perform b below.
(14) Set signal generator output to minimum.
b. Adjustments. Perform adjustments in Section IV below.
21. FM Modulation Analyzer
a. Performance Check
(1) Set TI as listed in (a) through (f) below:
(a) Press Tx TEST.
(b) Press SELECT to select ANTENNA.
