Operating Manual Vol 1 - ES Documentation

SMIQModulation - General2.6.2 LF GeneratorThe SMIQ is equipped with a LF-generator as internal modulation source as a standard. The generatorsupplies sinusoidal signals in the frequency range from 0.1 Hz to kHz.The frequency settings of the internal modulation signals can be made in one of the modulation menus(AM, FM, PM) as well as in the LF-output menu. Figure 2-25 shows the setting parameters using the AMmenu as an example.FREQ250. 000 000 0 MHz LEVEL - 10.0 dBmAMFREQUENCYLEVELANALOG MODVECTOR MODDIGITAL MODDIGITAL STDLF OUTPUTSWEEPLISTMEM SEQUTILITIESAMBB-AMFMPMPULSEAM DEPTHAM SOURCE INTAM SOURCE EXTAM EXT COUPLINGLFGEN FREQ15.5 %OFF INTOFF EXT1AC DC1.000 0 kHzFig. 2-25Example: Settings of the LF generator in the AM menu2.6.3 Simultaneous ModulationCombination of AM and FM as well as AM and vector modulation is possible. Instead of FM, phasemodulation (PM) can be switched on as well.Two-tone AM is possible by simultaneously switching on the external and internal source.Two-tone FM or two-tone PM is possible by simultaneously switching on FM1 and FM2 or PM1 andPM2. For FM1 and FM2 (PM1 and PM2) separate deviations can be set and separate sources switchedon.Note:With two-tone modulation please observe that the set deviation or modulation depth is valid forone signal and the sum deviation or sum modulation depth is determined by adding bothsignals. This results in overmodulation if the maximal value for deviation or modulation depth isexceeded.1125.5555.03 2.57E-8