
9. 3 dB Bandwidth Adjustments
A4A9
IF CONTROL
A4A9
Figure 3-45. Location of 3 dB Bandwidth Adjustments
9. On the spectrum analyzer, key in [FREQUENCY SPAN) 3 MHz,
MARKER
(OFF), (
PEAK
SEARCHJ,
MARKER
Ia],
and press
@J
several
times to position the second marker at the leftmost graticule line.
10. Readjust
A4A9R60
3 MHz for a MARKER A indication of -3.00
dB
410.05
dB.
11. Repeat steps 8 through 10 as necessary until no further
adjustment is required.
12. On the spectrum analyzer, key in the following settings:
&ENTER
FREQUENCY)
.....................................
100
MHZ
FREQUENCY SPAN)
km,
.......................................... .1
MHz
....................................................
1 MHz
13. On the spectrum analyzer, press [REFERENCE LEVEL) and use the
DATA knob to position the signal peak near the reference level
(top graticule line).
14. On the spectrum analyzer, key in [PEAK SEARCH), MARKER
@,
and press
@)
several times to position the second marker at the
leftmost graticule line.
15. Adjust
A4A9R61
1 MHz for a MARKER
A
indication of -3.00
dB
f0.05
dB.
16. On the spectrum analyzer, press
m
several times to position
the second marker at the rightmost graticule line. Then, press
[sTopI
and use the DATA knob to adjust the centering of the
displayed signal for a MARKER
A
indication of -3.00
dB
f0.05
dB.
17. On the spectrum analyzer, key in [FREQUENCY SPAN) 1 MHz,
MARKER
m),
[PEAK
SEARCHI),
MARKER la], and press
@j
several
times to position the second marker at the leftmost graticule line.
18. Readjust
A4A9R61
1 MHz for a MARKER
A
indication of -3.00
dB
410.05
dB.
19. Repeat steps 16 through 18 as necessary until no further
adjustment is required.
3-90
Adjustments
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