
14. 100 MHz VCXO Adjustments
Note
\
I
CENTER
iD8.000
00
MHZ
SPAN
3.00
kHZ
RES
BW
1
kHZ
“BW
3
ktiZ
SWP
3Em
msec
Figure 3-66. Typical Tuning Range of
A7A2
100 MHz VCXO
If the output power of the 100 MHz VCXO drops off by more than 1
dB
within
f300
Hz of 100 MHz, select a new value for factoryselect
component
A7A2L4.
An increase of
A7A2L4
by one standard value
will shift the tuning range of the 100 MHz VCXO lower in frequency
by approximately 500-600 Hz; conversely, a decrease in the value
of
A7A2L4
will shift the 100 MHz VCXO tuning range higher in
frequency by the same amount. Refer to
Table
3-7 for the acceptable
range of values and corresponding HP part numbers for
A7A2I.4,
and
to Figure 3-65 for the location of
A7A2L4.
Note
If
A7A2C4
100 MHz does not have sufficient adjustment range to tune
the 100 MHz VCXO +300 Hz to 100.000300 MHz, select a lower value
for factory- selected component
A7A2C8;
conversely, select a higher
value for
A7A2C8
if
A7A2C4
does not have sufficient range to tune
the 100 MHz VCXO -300 Hz to 99.999700 MHz. Refer to
‘lhble
3-3 for
the acceptable range of values, and to
‘Ihble
3-4 for HP part numbers;
refer to Figure 3-65 for the location of
A7A2C8.
Table
3-7. Standard Values for A7A2L4
Value HP Fart Number
560 nH
9100-2256
470 nH
9100-2255
390 nH
9100-2254
330 nH
9100-0368
270 nH
9100-2252
220 nH
9100-2251
7. Set the controls of the second spectrum analyzer as follows:
CENTER FREQUENCY
..................................
100 MHz
FREQUENCY SPAN
.....................................
,200 MHz
REFERENCE LEVEL
....................................
+3
dBm
RES BW
....................................................
AUTO
LOG SCALE
............................................
10 dB/div
3-128
Adjustments
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