2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
16. Harmonic and Intermodulation Distortion
Set the synthesized sweeper for an output CW frequency of
230.00 MHz and an output level of approximately -30
Press
on the analyzer. Key in the following settings:
FREQUENCY
] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
230 MHz
(
FREQUENCY SPAN
]
(
REFERENCE LEVEL
)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30
Connect equipment as shown in Figure 2-28, using the 250 MHz
low-pass filter. Adjust the synthesized sweeper output level to
place peak of signal trace at the top graticule line.
Press DISPLAY LINE
and key in 110
Press MARKER
(
PEAK SEARCH
],
STP SIZE
).
Activate
(
CENTER FREQUENCY
]
and press
to tune to the second
harmonic of the input signal.
Reduce
(
FREQUENCY SPAN
)
to 10
and
to 30 Hz.
Reduce
if necessary, for a margin of
between the
displayed noise and the display line.
The second harmonic should be below the display line
Second harmonic level of 230 MHz
Replace the 250 MHz low-pass filter with the 1200 MHz low-pass
filter.
Set the synthesized sweeper for an output CW frequency of
800.000 MHz.
Press
on the analyzer. Key in:
[
CENTER FREQUENCY
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
800 MHz
[
FREQUENCY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[
REFERENCE LEVEL
)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30
Adjust synthesized sweeper output level to place peak of signal
trace at
the
reference level line.
If unable to locate a harmonic distortion product, increase the output
level by 10
Be sure to return the output level to the original
setting before making a measurement.
13. Press DISPLAY LINE
and key in -100
14. Press MARKER
SEARCH
),
STP
[
CENTER FREQUENCY
)
SPAN
)
10
15. The second harmonic of the input signal should be below the
display line
Second harmonic level of 800 MHz
16. Replace the 1200 MHz low-pass filter with the 8
low-pass
filter.
17. Set the synthesized sweeper for an output frequency of 7200.000
MHz and an output level of 0
Performance Tests 2-67
