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ADJUSTMENTS
,
5
-
21.
BANDWIDTH FILTER ADJUSTMENTS (SERIAL PREFIX
1909A) (Cont'd)
PROCEDURE:
NOTE
Allow 30 minutes
warmup time before performing adjustments.
1.
Set spectrum analyzer controls
as
follows:
FREQUENCYBANDGHz
..................................................
.01-3
TUNING.
................................................................
35 MHz
FREQSPAN/DIV
..........................................................
10kHz
RESOLUTION BW
.........................................................
1 kHz
INPUTATTEN
.............................................................
30dB
REFLEVELdBm
...............................................................
0
Amplitudescale
..............................................................
LIN
........................................................
SWEEPTIME/DIV AUTO
.....................................................
SWEEPTRIGGER FREERUN
Crystal Alignment
Connect equipment
as
shown in Figure 5
-
5.
NOTE
If Sweep
GeneratorlBandwidth Control Assembly A9 has been replaced or
adjusted, perform steps 3 through 9. If not, proceed to step 10.
Set FREQ SPAN/DIV to 500 kHz and RESOLUTION BW to 1 MHz.
Center the signal with TUNING control. Using REF LEVEL FINE control, place signal at 7.1 divisions
(0.9 division from top graticule line).
Adjust
A9R85 LC until signal is two divisions wide at the fifth graticule line (1 MHz wide at 3
-
dB points).
Set FREQ
SPAN/DIV to 10 kHz and RESOLUTION BW to 10 kHz.
Using REF LEVEL FINE control, place signal at 7.1 divisions.
Adjust
A9R72 XTL until signal is one division wide at the fifth graticule line (10 kHz wide at 3dB points).
Set FREQ
SPAN/DIV to 10 kHz and RESOLUTION BW to 1 kHz.
Center signal with TUNING control. (It might be necessary to increase FREQ
SPAN/DIV temporarily to
find the signal.) Set REF LEVEL FINE control to place signal at sixth
gratiwle line.
NOTE
Do not readjust REF LEVEL
FINE control until all crystal and LC bandwidth
filter adjustments have been performed.