Operating Manual Vol 1 - ES Documentation

SMIQDigital Standard GSM/EDGEFig. 2-198Menu DIGITAL STD - GSM/EDGE - CLOCK..., SMIQ equipped with Modulation CoderSMIQB20 and Data Generator SMIQB11(CLOCK...) CLOCK SOURCE Selection of clock source.INT SMIQ uses internally generated clock signals.EXT An external bit clock is fed in at connectorBIT CLOCK. The clock synthesizer on themodulation coder is synchronized to thisclock.The symbol rate has to be set with anaccuracy of ± 1 %.The polarity, the trigger threshold and theinput resistance of the clock inputs can bemodified in menu DIGITAL MOD - EXTINPUTS.IEC/IEEE-bus SOUR:GSM:CLOC:SOUR INTDELAYSetting the delay of generated modulation signal to anexternal clock.This can be used, for example, for synchronization with asecond unit to achieve time synchronization between themodulation signals of the two units.IEC/IEEE-bus SOUR:GSM:CLOC:DEL 0.5POWER RAMPCONTROL...Opens a window for setting the envelope control, especially for the rising andfalling ramp at the beginning and end of a slot.Fig. 2-199Menu DIGITAL STD - GSM/EDGE - POWER RAMP CONTROL... , SMIQ equipped withModulation Coder SMIQB20 and Data Generator SMIQB11(POWER RAMPCONTROL...)SET DEFAULTRAMP TIMEResets the subsequent parameters to the factory-setvalues.IEC/IEEE-bus :SOUR:GSM:PRAM:PRESInput value for the rise and fall time of the envelopeat the beginning or end of a slot. The time is set inunits of symbol period.IEC/IEEE-bus SOUR:GSM:PRAM:TIME 2.51125.5555.03 2.309E-9