Measuring TX Spurious Emissions

Measuring TX Spurious Emissions

Last updated: November 12, 2008

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 mobile station's antenna output to the test set's front panel RF IN/OUT connector and power them on.
  2. Press the blue SHIFT key and then the green Preset key to full reset the test set.
  3. Establish a call with the mobile station (see How Do I Set Up a Call? ).
  4. Initialize the measurement:
    • Press the Measurement selection key.
    • Turn the knob to highlight the Tx Spurious Emissions measurement and press the knob.
  5. Press the Tx Spurious Setup ( F1 ) key to access the Tx Spurious Emissions Setup menu.
  6. Set the measurement parameters as needed for your test situation by using the knob and DATA ENTRY keys. (The parameters such as Adjacent Limit and Alternate Limit which are available when Mask Control is set to Manual .)

       
    NOTE
    For statistical measurement results, highlight the Multi-Measurement Count parameter and press the ON key or directly enter the number of measurement counts. The number of averages will default to 10.
       

       
    NOTE
    If single is selected in the Trigger Arm field, press the START SINGLE key to trigger each measurement. If the Trigger Arm is set to Continuous the measurement began executing as soon as you initialize the measurement in step 4.
       

  7. Press the Close Menu ( F6 ) key. The numeric results will display by default.
  8. Press the Graph ( F3 ) key to display a graphical measurement results.
    • 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.
    • You can also press the Numeric ( F2 ) key to display the numeric results anytime.
  9. After finishing the measurements:
    • If desired, turn the measurement off by pressing the Measurement selection key, selecting Tx Spurious Emissions , then Close Measurement ( F4 ).

Testing 4.5.1 Conducted Spurious Emissions

Definition: Conducted spurious emissions are emissions at frequencies that are outside the assigned CDMA Channel, measured at the mobile station antenna connector. This test measures the spurious emissions during continuous transmission.

The test set does not support the Enhanced Access Channel tests. The following test procedure is for Access Channel and assumes that the mobile station supports Band Class 1 (US PCS). You should change the settings as specified for other configurations. Unless otherwise stated, leave all parameter settings to the defaults.

  1. Connect the mobile station's antenna output to the test set's front panel RF IN/OUT connector and power them on.
  2. Press the blue SHIFT and then the green Preset key to full reset the test set.
  3. Set the following access parameters (see C. Access Parameters or Enhanced Access Parameters ):
    • Set Nominal Power (NOM_PWR) to 7 dB.
    • Set Initial Power (INIT_PWR) to 15 dB.
    • Set Power Step (PWR_STEP) to 7 dB/step.
    • Set Number of Steps (NUM_STEP) to 15 (16 probes/sequence).
    • Set Maximum Response Sequence (MAX_RSP_PWR) to 15 sequences.
  4. Establish a call with the following parameter settings (some settings may change as needed).
    • Press CALL SETUP to access Call Parms and Call Control menus.
    • Set Cell Band ( F8 on the Call Parms 1 of 3 ) to US PCS .
    • Set Radio Config ( F11 on the Call Parms 1 of 3 ) to (Fwd1, Rvs1) .
    • Select FCH Service Option Setup ( F12 ) (Call Parms 1 of 3) , set Service Option for Fwd1, Rvs1 to SO2 (Loopback) .
    • Set Traffic Data Rate ( F12 on the Call Parms 2 of 3 ) to Full .
    • Press Originate Call ( F3 ) to initiate a call. Verify that the Connected is in the Active Cell status field.
  5. Set Cell Power (Î or ) to -104 dBm/1.23 MHz ( F7 on the Call Parms 1 of 3 ).
  6. Set Rvs Power Ctrl to All Up bits ( F7 on the Call Parms 2 of 3 menu) to transmit continuous '0' power control bits.
  7. Press the Measurement selection key, select the Tx Spurious Emissions measurement.
  8. Press the Tx Spurious Setup ( F1 ) key to access the Tx Spurious Emissions Setup menu. Set the measurement parameters as needed.
    • The Adjacent Limit and Alternate Limit settings default to -42 dB and -50 dB. You can change the value when Mask Control is set to Manual .
    • Set F-FCH/Traffic Level to -7.4 dB.
    • Set Trigger Arm to Single.
    • Press Close Menu ( F6 ).
  9. If single is selected in the Trigger Arm field, press the START SINGLE key to trigger each measurement. If the Trigger Arm is set to Continuous , skip this step.
  10. Press MEASUREMENT key, observe the measurement results (see General Procedure for details). The numeric results will be displayed by default. To display a graphical measurement results, press the Graph ( F3 ) key. 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.
  11. After finishing the measurements:
    • If desired, turn the measurement off by pressing the Measurement selection key, selecting Tx Spurious Emissions , then Close Measurement ( F4 ).

Related Topics

Tx Spurious Emissions Measurement Description

Programming a Tx Spurious Emissions Measurement

Tx Spurious Emissions Measurement Troubleshooting