R&S®SML / R&S®SMV03 Modulation - General
1090.3123.12 4.9 E-6
Modulation - General
The R&S SML / R&S SMV03 offers the following modulation types :
• Amplitude modulation (AM),
• Frequency modulation (FM),
• Phase modulation (M),
• Pulse modulation PULSE (Option R&S SML-B3),
• Stereo modulation STEREO (Option R&S SML-B5),
• Vector modulation VECTOR (R&S SMV03 only),
For all modulations except vector modulation an internal or external modulation source can be used. For
stereo modulation external analog R or L signals can be applied. The operation modes R, L, R=L, R=-L
and RL are available. In addition the R&S SML / R&S SMV03 provides an S/P DIF input for externally
generated digital stereo signals. Vector modulation requires external modulation signals.
Modulation Sources
Internal modulation source
For AM and FM/M, an internal modulation generator (Lfgen) is available. For more information see
section "LF Generator". ". The generator can also be used for analog stereo modulation. In this case the
operation modes R, L, R=L, R=-L are available. For more information see section "Stereo Modulation
(option R&S SML-B5)".
For internal pulse modulation (option R&S SML-B3), the instrument is equipped with a pulse generator.
For more information see section "Pulse Generator".
External modulation source for AM, FM/!M) and PULSE
For external modulation, input connectors MOD (AM, FM/M) and PULSE (Pulse modualtion) are
available. External AM and FM/M can be AC- or DC-coupled.
External modulation signals should have a voltage of V
p
= 1 V (V
rms
= 0.707 V) to maintain the
displayed modulation depth or deviation.
External modulation sources for stereo modulation
For external analog stereo modulation, input connectors STEREO R and STEREO L are available at the
rear panel of the R&S SML / R&S SMV03 .
External modulation signals should have a voltage of V
p
= 1 V (V
rms
= 0.707 V) to maintain the
displayed frequency deviation.
For external digital stereo modulation the unsymmetrical BNC input connector S/P DIF is available (input
impedance of 75 ). The external modulation signal should have a voltage of V
p
p
= 400 mV to V
p
p
= 5 V.
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