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ADJUSTMENTS
*
5
-
22.
3
dB BANDWIDTH ADJUSTMENTS (SERIAL PREFIX lgO9A) (Cont'd)
Compare new frequency with frequency recorded in step
20.
The difference between the two frequencies
should
be
9.000
kHz
to
11.000
kHz.
NOTE
A9R72 XTL may be further adjusted to bring the 10 kHz and
1
kHz band
-
widths within limits; however, the final measurement of the 3 kHz bandwidth
must
be
between 2700 Hz and
3300
Hz. (If the 10 kHz bandwidth cannot be
brought within limits by adjustment of
A9R72 XTL, change the value of fac
-
tory
-
selected resistor A9R78*.)
Set RESOLUTION
BW
to
1
kHz.
nne signal generator to
peak
signal on oscilloscope display.
Adjust REF LEVEL FINE to place signal at
7.1
divisions. Record counter frequency.
MHz
Increase signal generator frequency until signal on oscilloscope display drops to the fifth graticule line.
Record new counter frequency.
MHz
The difference between the two frequencies recorded in steps
24
and
25
should be
450
Hz
to
550
Hz.
Reconnect
AlOWl
to
A5J2.