Programming an I/Q Tuning Measurement

Programming Example

The following program shows how to make an I/Q Tuning measurement on a normal GSM TCH burst. If you want to test a CW signal all you need to change in this program is the trigger type, which should be set to Immediate, rather than RF Rise.

 
10    PRINT "Ensure your mobile is transmitting:" !On-screen prompts.
20    PRINT "-all 1s or all 0s."
30    PRINT "-on ARFCN 30."
40    PRINT "-a power level of 10 dBm."
50    PRINT "                         "
60    PRINT "Press any key to continue."
70    LOOP
80      ON KBD GOTO Key_exit
90    END LOOP
100 Key_exit: ! 
110   OUTPUT 714;"RFANALYZER:MANUAL:CHANNEL:SELECTED 30" !Configures the
120                      !test set to expect a transmission on ARFCN 30.
130   OUTPUT 714;"RFANALYZER:EXPECTED:POWER:SELECTED 10 DBM" !Configures
140                     !the test set to expect a power level of 10 dBm.
150   OUTPUT 714;"SETUP:IQTUNING:CONTINUOUS OFF"  !Configures trigger
160                       !mode to single for an I/Q Tuning measurement.
170   OUTPUT 714;"SETUP:IQTUNING:COUNT:SNUMBER 50"  !Configures the
180   OUTPUT 714;"SETUP:IQTUNING:SPUR:STATE ON"  !Configures spur on.
190   OUTPUT 714;"SETUP:IQTUNING:SPUR:FREQUENCY 10MHZ" !Configures a
200   !power measurement at 10MHz from the carrier.
210   !multi_measurement state to ON with a measurement count value
220   !of 50.
230   OUTPUT 714;"SETUP:IQTUNING:TRIGGER:SOURCE RISE" !Configures the
240                                        !trigger source to RF RISE.
250   OUTPUT 714;"SETUP:IQTUNING:REFERENCE:FREQUENCY AUTO" !Sets the
260   !set to choose which offset frequency is to be used as the ref.
270   OUTPUT 714;"INITIATE:IQTUNING" !Start I/Q Tuning measurement.
280   OUTPUT 714;"FETCH:IQTUNING:ALL?"!Fetches the measurement integrity
290   !value and the relative power levels at the offset frequencies.
300   ENTER 714;Integrity,N270,N203,N135,N67,Carrier,P67,P135,P203,P270,Sr
310   PRINT "I/Q Tuning Measurement Results"
320   PRINT "Integrity = ";Integrity
330   PRINT "Spur Power = ";Sr
340   PRINT "Offset (kHz)       Level (dB)"
350   PRINT "------------       ----------"
360   PRINT "-270.334          ";N270
370   PRINT "-203.125          ";N203
380   PRINT "-135.417          ";N135
390   PRINT "-67.708           ";N67
400   PRINT "0.000             ";Carrier
410   PRINT "+67.708           ";P67
420   PRINT "+135.417          ";P135
430   PRINT "+203.125          ";P203
440   PRINT "+270.334          ";P270
450   END

Returned Values

The measurements returned by this program are:

• Integrity returns the measurement Integrity Indicator (0 means a successful measurement with no errors).
• The signal level of the following offsets are measured relative to the signal level at the reference offset (either Fc + 67.7083 kHz for all 0s or Fc -67.7083 kHz for all 1s). Note, if the TX I/Q Tuning measurement multi-measurement command is set to ON the average of all the individual results at each offset are returned.
  • -270.833 kHz
  • -203.125 kHz
  • -135.417 kHz
  • -67.7083 kHz
  • Carrier Frequency
  • +67.7083 kHz
  • +135.417 kHz
  • +203.125 kHz
  • +270.833 kHz

Related Topics

I/Q Tuning Measurement Description

SETup:IQTuning

INITiate

FETCh:IQTuning