PERFORMANCE TESTS
4. AM Bandwidth Test
a. Program the UUT for 50% INT AM at 1 kHz rate at 100 MHz, and -2 dBm.
b. With the modulation analyzer reading AM%, press the RATIO DB key to
normalize the reading to 0.0 dB.
c. Set the modulation frequency to 100 kHz and read the change in level in AM in
dB. Verify that the reading is greater than -3.0 dB.
d. Repeat steps a through c at 14, 20, 30, 40, 60, 80, 160, 250, 320, 400, 550, 640,
700, 850, 950, 1056 MHz.
e. Repeat steps a through d at -3 dBm.
5. Incidental FM Test
a. Program the UUT for 50% INT AM at 1 kHz, at 640 MHz, and -2 dBm.
b. Program the modulation analyzer to measure peak FM deviation in a 0.3- to
3-kHz bandwidth. Connect the HFSSG to the external Local Oscillator input.
c. Verify that the incidental FM is less than 200 Hz.
NOTE
It may be necessary to compensate for residual noise effects using the
procedure presented in the manual provided with the Modulation
Analyzer.
d. Repeat step c at frequencies of 320, 160, 80, 40, 20, 14 MHz.
6. Residual AM Test
a. Program the UUT to 640 MHz, +13 dBm, and no modulation.
b. Connect the UUT RF OUTPUT to the diode detector to the phase noise test
set.
c. Calibrate the system by setting the UUT to 10% AM (measure with modulation
analyzer).
d. Verify that the residual AM is less than 0.01%, using the integrated noise mode
of the phase noise set.
7. FM Accuracy and Distortion Test
a. Connect the modulation analyzer to the UUT RF OUTPUT.
b. Program the modulation analyzer to measure peak FM in a 0.3- to 3-kHz
bandwidth.
c. Program the UUT frequency to 640 MHz, +7 dBm, 20-kHz deviation, INT FM
and 1-kHz modulation rate.
4-20
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