Analog modulation is a method used to transmit information of an LF (Low Frequency) signal in accordance with a second signal, typically one of a higher frequency. This is done by varying one or more properties of a high frequency waveform, called the modulation or carrier signal, with the modulating signal that contains the information to be transmitted.
The three key parameters of the modulation signal are the amplitude, phase and frequency. These parameters are modified in accordance with the low frequency signal to obtain the modulated RF signal.
- AM (Amplitude Modulation)
- FM (Frequency Modulation, analog and digital)
- PhiM (Phase Modulation, analog and digital)
- PULM (Pulse Modulation)
- Chip Modulation
- R&S SMA-B20 (FM/PhiM Modulator) for performing Frequency modulation (FM) and phase modulation (PhiM)
R&S SMA-B22 (Enhanced Phase Noise Performance andFM/PhiM Modulator)
Chirp modulation is available with one of these options and an interface board with part number 1400.0530.02. - R&S SMA-K23 High Performance Pulse Generator features extended pulse modulation
- R&S SMA-K24 Multifunction Generator provides a second LF Generator and a Noise generator
The LF Generator can be used as a second modulation source with extended frequency range and selectable signal shapes. The noise source provides white noise with selectable bandwidth and level distribution as additional modulation source. - R&S SMA-K25 VOR/ILS Modulation for generating test signals for avionic systems (VOR (VHF Omnidirectional Range), ILS-GS (Instrument Landing System - Glide Slope), ILS-LOC (Instrument Landing System - Localizer) and Marker Beacon).
- R&S SMA-K26 DME Modulation
- R&S SMA-K27 Pulse Train enables generation of pulse trains
Settings for the modulation are made in separate modulation menus. These menus can be accessed in the block diagram by way of the "Modulation" function block, or by means of the menu with the same name which is opened using the MENU key.
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