Filter
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15. Spurious Responses Test
Intermodulation
Distortion
SPECTRUM
ANALYZER
ATTENUATOR
ATTENUATOR
DIRECTIONAL
50
MHz
LON
PASS
FILTER
Figure 2-26. Intermodulation Distortion
Test
Setup
11. Connect equipment as shown in Figure 2-26.
12. Set the controls of the spectrum analyzer as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5 MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 MHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20
dBm
DISPLAY LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
13. On the synthesized sweeper, key in
[cw
30 MHz, [POWER LEVEL],
-4 dBm and use the ENTRY knob to position the peak of the
displayed 30 MHz signal at the top CRT graticule line.
14. On the frequency synthesizer, key in
[FREQUENCY) 29 MHz,
(AMPLITUDE)
-4
dBm.
Readjust the signal amplitude as necessary
to position the peak of the displayed 29 MHz signal at the top CRT
15.
Set the controls of the spectrum analyzer as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 Hz
16.
On the spectrum analyzer, key in DISPLAY LINE (ENTER) -100
dBm, MARKER [PEAK SEARCH) to position a marker on the peak of
the displayed 29 MHz signal.
17.
18.
19.
On the frequency synthesizer, adjust the signal amplitude for a
marker indication of -20.00
dBm.
On the spectrum analyzer, key in [CENTER FREQUENCY) 30 MHz,
MARKER
[PEAK SEARCH) to position a marker on the peak of the
displayed 30 MHz signal.
On the synthesized sweeper, adjust the signal power level for a
marker indication of -20.00
dBm.
graticule line.
2-52 Performance Tests