Operating Manual Vol 1 - ES Documentation

SMIQDigital Standard 3GPP W-CDMA (FDD)CLOCK SOURCEEXT CLOCK MODEAllows selection of the clock source for the chip clock(see section 2.14.2.11).INT The SMIQ operates with internallygenerated clock signals.EXT A chip clock has to be fed in externally at theSYMBOL CLOCK connector. The CHIPRATE parameter must be set with anaccuracy of ± 1 %. The polarity, the triggerthreshold and the input resistance of theSYMBOL CLOCK input can be changed inDIGITAL MOD - EXT INPUTS menu.IEC/IEEE-bus command:SOUR:W3GP:CLOC:SOUR INTSelection of type of external chip signal.CHIP chip clockCHIPX4 Vierfacher ChiptaktATTENTION:An external chip clock is fed in at connectorSYMBOL CLOCK. Multi-folds chip clock has tobe fed in at the connector BIT CLOCK!IEC/IEEE bus command:SOUR:W3GP:CLOCk:MODE CHIP4CLOCK DELAYSetting the delay of generated modulation signal to anexternal clock. This can be used, for example, for synchronizationwith a second unit to achieve timesynchroneity between the modulation signals of thetwo units. The displayed setting resolution of1/100 symbol is only attained for symbol-clockfrequencies below 100 kHz. The resolution is reducedwith increasing frequency. At a chip rate of1.2288 Mcps, the resolution equals the chip duration ×0.1.IEC/IEEE-bus command:SOUR:W3GP:CLOC:DEL 0.5TOTAL POWERDisplays the total power of activated code channels.The total power is calculated from the power ratio of theactivated code channels with the modulation switchedon (STATE=ON). If the value is not equal to 0 dB, theindividual code channels are internally adjusted (whilemaintaining the power ratios) so that the TOTALPOWER is 0 dB to obtain the output level (LEVEL) setin the header of the display. In addition to the averagepower, the peak envelope power (PEP) is alsodisplayed.IEC/IEEE-bus command :SOUR:W3GP:POW?1125.5555.03 2.187E-9