Please refer to the User Guide for selecting the TD‑LTE Signal Analyzer mode, setting up frequency, amplitude, and file management. In addition, perform the following TD‑LTE specific setup procedures.
1. Press the Setup main menu key.
2. Press the BW submenu key to open the Select Bandwidth list. Select the desired Bandwidth with the arrow keys or rotary knob and press Enter.
3. Press the EVM Max Hold submenu key On to display both the Maximum EVM value since Reset and the current measured value. This applies to EVM RMS and Peak values. Selecting Off displays only the current measured value.
4. Press the EVM Mode submenu key to select either Auto or PBCH Only. Selecting Auto measures Physical Downlink Shared Channel (PDSCH) if data is available, otherwise it measures Physical Broadcast Channel (PBCH), a control channel that carries a broadcast message. Selecting PBCH Only forces a PBCH measurement.
Note
The Constellation will show a QPSK constellation when PBCH is being measured. PBCH Only mode is especially useful when making measurements over the air under conditions where the transmitted data uses MIMO.
5. Press the Trigger submenu key. The Trigger menu opens to set Trigger Source and Trigger Polarity. For Trigger Source select No Trig or Ext. Then select the trigger edge by setting Trigger Polarity to Rising or Falling. Press the Back submenu key to return to the Setup menu.
6. (Not applicable for all models) Press the Ext. Ref. Freq submenu key to configure the instrument using an external reference frequency. The External Reference Frequency list opens. Highlight the desired frequency and press Enter.
Antenna Status
The Antenna Status indicator can show when antennas are detected and which one is currently being measured. Antenna Status is displayed for any EVM measurement shown: Constellation, Control Channel Power, Modulation Summary and LTE Summary. The antennas icons are displayed at the lower‑left corner of the display screen (Figure: Antenna Status).
