To make EVDO RF measurements, connect the instrument to the base station following the setup instructions. Press the
Measurement and
RF Measurement submenu keys to open the measurement menu.
From the RF Measurement menu, press
Power vs Time to display the active measurement. (
Figure: “EVDO Power vs. Time”).
ACPR (Adjacent Channel Power Ratio) is defined as the ratio of the amount of leakage power in an adjacent channel to the total transmitted power in the main channel and is displayed in table format under the bar graph.
From the RF Measurement menu, use the following procedure for ACPR:
The Spurious Emission test examines emissions at frequencies that are outside of the assigned EVDO channel. Spurious emission should be measured at the base station RF output port by using a direct cable connection.
To perform the test, select the correct band class and channel number. A band-class-specific mask will be shown on the screen. Maximum emission power in each frequency offset region will be highlighted by markers. Typical resolution bandwidths (RBW) that are used in the emission test are 30 KHz and 1 MHz. Due to the variable RBW in some band classes, the spectrum can appear to have “steps”.
For accurate EVDO emission measurements, users are required to input an all-idle or all-active signal, and to set the instrument slot setting accordingly. The emission mask is drawn according to the following document: Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Network. (See 3GPP2 C.S0032-A or TIA-864-A for details.)
From the RF Measurement menu, press the
Spurious Emission submenu key to activate the measurement (
Figure: “EVDO Spurious Emission”). The red dot on the submenu key indicates that it is selected.