Measuring TX Spurious Emissions

Measuring TX Spurious Emissions

Last updated: January 16, 2009

General Procedure

   
NOTE
Channel power calibration should be performed if the test set is being used for the first time or the operating environment has changed significantly since the last calibration was performed. The channel power calibration also calibrates the TX spurious emissions measurement. See Calibrating the Test Set for details.
   

  1. Connect the access terminal to the test set's front panel RF IN/OUT connector and power it on.
  2. Wait for the access terminal to open a session and then open an RTAP (for subtype 0 physical layer) or RETAP (for subtype 2 physical layer) or RMCTAP (for subtype 3 physical layer) data connection for AT's transmitter test. See How Do I Open a Session and Test Data Connection? for detailed procedure.
  3. Set the RTAP Rate ( F12 ) and FTAP Rate ( F11 ) on the Call Parms 1 of 3 menu as needed if during an RTAP connection, or set the R-Data Pkt Size ( F12 ) and F-Traffic Format ( F11 ) on the Call Parms 1 of 3 menu as needed if during an RETAP or RMCTAP connection.
  4. Initialize the TX spurious emissions measurement:
    • Press the Measurement selection key.
    • Turn the knob to highlight the TX Spurious Emissions measurement and press the knob.
  5. Select TX Spurious Emissions Setup ( F1 ) to access the TX Spurious Emissions Setup menu. From this menu you can configure measurement parameters such as Mask Control and Adjacent Limit and Alternate Limit . (These parameters are only available when Mask Control is set to Manual , see TX Spurious Emissions Measurement Parameters for more information.) For statistical measurement results, highlight the Multi-Measurement Count parameter and press the ON key. The number of averages will default to 10. You can change the value as desired.
  6. Select Close Menu ( F6 ) to close the TX Spurious Emissions Setup window.
  7. From the Call Parms menu, configure Cell Power ( F7 ), as needed.
  8. Measure TX spurious emissions:
    • If the Trigger Arm field is set to Single , press the START SINGLE key to trigger each measurement.
    • If the Trigger Arm field is set to Continuous , the measurement began executing as soon as you initialized it in step 3.
  9. Select Graph ( F3 ) to display a graphical view of the results, or Numeric ( F2 ) to display numeric results.
  10. When viewing the graphical display, you can select Marker Position ( F4 ) and turn the knob to display the spurious emissions levels at each of the frequency offsets.

Typical numeric and graphical measurement results are shown below:

Testing 4.4.1 Conducted Spurious Emissions

For details on performing the steps below, see the General Procedure above.

  1. Initialize the TX spurious emissions measurement.
  2. Set the following access parameters (see How Do I Change Access Parameters? ):
    • Set Open Loop Adjust to 81 dB or 84 dB, depending upon band class.
    • Set Probe Initial Adjust to 15 dB.
    • Set Probe Power Step to 7.5 dB/step.

  3. For Subtype 0 or 1 Physical Layer, set up a Test Application session and open an RTAP connection with the RTAP Rate ( F12 on the Call Parms 1 of 3 menu) set to 153.6 kbps . For detailed procedure on how to open an RTAP session and connection, see How Do I Open a Session and Test Data Connection? .

    For Subtype 2 Physical Layer, set up a Test Application session and open an RETAP connection with the following setups. For detailed procedure on how to open an RETAP session and connection, see How Do I Open a Session and Test Data Connection? .

    • Set the R-Data Pkt Size ( F12 on Call Parms 1 of 3 ) to 4096 bits.
    • Set the Reverse Data Transmission Mode under the Application Config ( F10 on Call Parms 1 of 3 ) menu to High Capacity .
    • From the Power Parameters Info menu (see How Do I Change Channel Gain/Traffic Info Parameters? for how to access), set the 4096-bit High Capacity Termination Target to 3 (4 sub-frames, 16 slots). (NOTE: You do not need to set these settings unless the default value (3) of these settings are changed. Changing these setting results in an open data connection closed because these settings are configured during session negotiation. Once this happen, you need to re-open the connection.)

  4. C.S0033 specifies to configure the Test Application FTAP (for Subtype 0 or 1 Physical Layer) or FETAP (for Subtype 2 Physical Layer) with a Forward Traffic Channel rate of 307.2 kbps (2-slot version) and the ACK Channel is transmitted at all the slots.
    To do this, set the FTAP Rate ( F11 on Call Parms 1 of 3 ) to 307.2 (2 Slot) if during subtype 0 physical layer test or set the F-Traffic Format ( F11 on Call Parms 1 of 3 ) to 4 (1024, 2, 128) if during subtype 2 physical layer test, and set ACK Channel Bit Fixed Mode to On from Application Config ( F10 on Call Parms 1 of 3 ).
  5. Set Î or ( Cell Power ) to -60 dBm/1.23 MHz.
  6. Set Rvs Power Ctrl to All Up bits ( F7 on the Call Parms 2 of 3 menu) to transmit continuous up power control bits.
  7. Measure TX Spurious Emissions, and note the pass/fail result.
  8. If the AT supports Subtype 3 Physical Layer and two or three reverse CDMA channels, perform the following steps.

       
    NOTE
    When more than one test set is configured to perform a multiple carrier measurement (see Multi-carrier Multi-unit (MCMU) ), not all parameters can be set on each test set because of the interaction between the test sets. For example, some parameters can not be set or changed on the auxiliary unit because it is controlled by the main unit, and some of the parameters of the auxiliary unit can be set as associated parameters on the main unit. For which parameters can or can not be set on a single test set, see Multicarrier Parameters and Multi-carrier Multi-unit Setting Interactions .
       

  9. Test 1: Perform the same step as 1-7.
  10. Test 2 (step 11-15): Configure the access terminal to transmit on the two carriers at the maximum possible frequency separation (Max Reverse Link Bandwidth reported by the AT) between them.
  11. Set up a Test Application session and open an RMCTAP connection with the following setups. For detailed procedure on how to open an RMCTAP session and connection, see How Do I Open a Session and Test Data Connection? .
  12. C.S0033 specifies to configure the Test Application FMCTAP (for Subtype3 Physical Layer) with a Forward Traffic Channel rate of 307.2 kbps (2-slot version) and the ACK Channel is transmitted at all the slots.
    To do this, set the F-Traffic Format ( F11 on Call Parms 1 of 3 ) to 4 (1024, 2, 128) , and set ACK Channel Bit Fixed Mode to On from Application Config ( F10 on Call Parms 1 of 3 ).
  13. Set Î or ( Cell Power ) to -85 dBm/1.23 MHz.
  14. Set Rvs Power Ctrl to All Up bits ( F7 on the Call Parms 2 of 3 menu) to transmit continuous up power control bits.
  15. Measure TX Spurious Emissions, and note the pass/fail result on each of the test set.
  16. Test 3 (step 16-21): Configure the access terminal to transmit on all the adjacent reverse CDMA channels at a spacing of 1.23 MHz or 1.25 MHz (depends on the channel band) between the center frequencies.
  17. Set up a Test Application session and open an RMCTAP connection with the following setups. For detailed procedure on how to open an RMCTAP session and connection, see How Do I Open a Session and Test Data Connection? .
  18. C.S0033-B specifies to configure the Test Application FMCTAP (for Subtype3 Physical Layer) with a Forward Traffic Channel rate of 307.2 kbps (2-slot version) and the ACK Channel is transmitted at all the slots.
    To do this, set the F-Traffic Format ( F11 on Call Parms 1 of 3 ) to 4 (1024, 2, 128) , and set ACK Channel Bit Fixed Mode to On from Application Config ( F10 on Call Parms 1 of 3 ).
  19. Set Î or ( Cell Power ) to -85 dBm/1.23 MHz.
  20. Set Rvs Power Ctrl to All Up bits ( F7 on the Call Parms 2 of 3 menu) to transmit continuous up power control bits.
  21. Measure TX Spurious Emissions, and note the pass/fail result only on the Main unit.

When you have finished testing, be sure to set the Rvs Power Ctrl back to Active bits to ensure that subsequent signalling is successful (see Reverse Closed Loop Power Control ).

Related Topics

TX Spurious Emissions Measurement Description

Programming a Tx Spurious Emissions Measurement

4.4.1 Conducted Spurious Emissions

Tx Spurious Emissions Measurement Troubleshooting