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Digital Radio Testing
1-16
30, 100, 300, 600 and 1200 MHz per second. Choose
a value and press
4 ENTER 5
9. The display will now read \
refers to the maximum deviation of frequency the
notch will take as it makes a measurement. See
gure below. Use the arrow or data keys to select a
6
6
6
6
value (
1,
2,
4,
set a value that will cause the starting or stopping
frequency for your measurement to exceed allowable
bounds. For instance, if you set the start frequency
at 45 MHz, and set the deviation at
error message will result (45 20 = 25, and 25
MHz is below the minimum frequency for Fader).
There is a guardband of
used to prevent errors. The formula for calculating
acceptable deviation values is:
START FREQ (
MHz
j
STOP FREQ +(
MHz
Use the arrow keys to set
.
4 ENTER 5
HP 11757B
. Refer to gure 1-3.
9 DEVIATION
6
6
6,
10 and
20 MHz). Do not
6
20 MHz, an
6
4 MHz that should be
j
j
DEVIATION
+4 MHz)
j
DEVIATION
+4 MHz)
6
5 MHz, then press
". This
40
100
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