Instrument Function > Modulation > Overview of Modulation > Modulation Sources > External Modulation Sources
External Modulation Sources

The modulation inputs AM EXT, FM/PM EXT and PULSE EXT at the rear of the instrument are provided as the external modulation source for amplitude, pulse, frequency and phase modulation. The external signal for digital FM/PM modulation is fed in via the AUX I/O interface. The AM EXT connector can be used to feed in external VOR/ILS signal in addition.

The external modulation signal for AM, FM and PM at the input must have a voltage of US = 1 V (UEFF = 0.707 V) in order to achieve the displayed modulation depth and range. The input voltage should not exceed 1 V, otherwise modulation distortions might occur.

The PULSE EXT connector at the rear of the instrument controls the external pulse modulation. The input shows some hysteresis with threshold levels of 0.7 V/0.9 V. The voltage must not exceed 10 V.

 


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