TB 9-6625-2351-35
until ∆ MKR indicates between -0.02 and +0.02 dB. Record synthesizer/level generator
frequency indication as lower 3 dB frequency.
(14) Subtract lower 3 dB frequency recorded in (13) above from upper 3 dB frequency
recorded in (12) above. The result will be within the limits specified in table 3. Record the
result as actual 3 dB bandwidth in table 3.
(15) Set synthesizer/level generator frequency to 40 MHz.
(16) Press TI MARKER OFF key.
Test instrument
3 dB bandwidth limits
Actual bandwidth
CONTROL BW
Lower 3 dB
Upper 3 dB
[RES SW]
frequency
frequency
3dB
60 dB
settings
Min
Max
(14)
(27)
2 MHz
1.5 MHz
2.5 MHz
1 MHz
750
kHz
1.25 MHz
300 kHz
270
kHz
330
kHz
100 kHz
90
kHz
110
kHz
30 kHz
27
kHz
33
kHz
10 kHz1
9
kHz
11
kHz
3 kHz1
2.7 kHz
3.3 kHz
1 kHz1
900
Hz
1.1 kHz
300 Hz1
270
Hz
330
Hz
100 Hz1
70
Hz
130
Hz
1Press
TI CONTROL BW key then [VIDEO BW] to 1 Hz.
NOTE
The 3 dB bandwidth recorded in table 3 will be used to
determine shape factor in (28) below.
(17) Repeat technique of (4) (i) and (7) through (16) above for remaining CONTROL
(18) Press TI keys and enter values using DATA keys as listed in (a) through (c) below:
(a) AMPLITUDE then [LOG dB/DIV] to 10 dB.
(b) CONTROL BW then [RES BW] to 2 MHz (1 MHz for SN prefix below 2805A).
(c) [VIDEO BW] to 300 Hz.
(19) Set synthesizer/level generator amplitude to -3 dBm and AMPTD INCR to 60 dB.
(20) Press TI keys as listed in (a) through (d) below:
(a)
AMPLITUDE.
(b)
[MORE].
(c)
[IF ADJUST].
(d)
[ADJ CURR IF STATE] wait for IF ADJUST STATUS messages to disappear.
(21) Press synthesizer/level generator FREQUENCY key and adjust frequency to
peak signal amplitude on TI display.
11
