Chapter 3 — Options Verification 3-12 Option 885, Mobile WiMAX Signal Analyzer Verification
MS2720T MM PN: 10580-00342 Rev. D 3-51
18. Measure the EVM(rms) for both –15 dBm and –30 dBm, and then record the measured results into
Table A-125.
19. Verify that the measured EVM is within specification.
20. Repeat Step 11 through Step 14 to measure the Frequency Error at 3600.5 MHz.
Residual EVM and Frequency Error (5 MHz Bandwidth and 5 ms Frame Length)
21. Set the MG3700A as follows:
a. Press the yellow Preset button (answer yes to the question).
b. Press the Set key
c. Press the (F1) submenu key to select “Load File to Memory”.
d. Press the (F1) submenu key again to select “Select Package”.
e. Using the Down Arrow key, step through the selection list until “mWiMAX” is highlighted.
f. Press the Set key.
g. Press the (F6) submenu key, Return.
h. Press the Set key. The “Select Package” list box is displayed. Again select mWiMAX and press Set.
i. Another file list is displayed. Select (highlight) 5m512g8_2_5_cap.
j. Press the Set key.
k. Press the MOD On/Off key and verify that the LED is On. Ensure that the “Playing” indicator is
displaying the moving pattern.
l. Press the Frequency key, then enter 2600.5 MHz.
m. Press the Level key, then enter –15 dBm adjust the level until the power meter reads
–15 dBm ± 0.2 dB. Turn the output On.
22. Set the MS2720T as follows:
a. Press the Freq main menu key and set the Center Freq to 2600.5 MHz.
b. Press the Setup main menu key and set the Bandwidth to 5MHz.
c. Press the CP Ratio submenu key (under the Setup main menu key) and set the CP Ratio to 1/8.
d. Press the Frame Length
submenu key and set the Frame Length to 5ms.
e. Press the Demod submenu key and set Demod to FCH.
f. Press the Measurements main menu key, press Demodulator, then press Modulation Summary.
23. Repeat Step 6 through Step 20, recording the results into Table A-127, “Demodulation, Mobile WiMAX
Residual EVM (5 MHz Bandwidth and 5 ms Frame Length)” on page A-58 and Table A-128,
“Demodulation, Mobile WiMAX Frequency Error (5 MHz Bandwidth and 5 ms Frame Length)”
on page A-58.
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