The Rohde & Schwarz SMX is a synthesized signal generator delivering precise RF output across 100 kHz to 1 GHz, engineered for receiver testing, component characterization, and production validation. Three nested VCOs eliminate the need for frequency doublers, yielding exceptional spectral purity and phase noise performance critical for AM, FM, and SSB measurements. The instrument combines stable frequency synthesis with flexible modulation—AM to 99% depth, FM deviation to 800 kHz, and pulse modulation with 20 ns rise time—making it equally suitable for laboratory development and high-volume manufacturing environments.
Technical Specifications
Frequency Coverage: 100 kHz to 1 GHz (extended operation to 10 kHz and 1005 MHz)
Frequency Resolution: 10 Hz with adjustment steps of 10 Hz, 50 Hz, or 100 Hz
RF Output Level: −137 dBm to +13 dBm with level uniformity better than 1 dB (typical 0.3 dB) and total error less than ±1.5 dB. Non-interrupting level adjustment across 10 dB range; overload protection rated to 30 W.
Output Impedance: 50 Ohm
Modulation Capabilities:
• AM: 0–99% depth with simultaneous FM capability
• FM: 100 Hz to 800 kHz deviation, simultaneous AM capability
• Pulse: 20 ns rise time, 10 MHz refresh rate, 2 µs RF envelope rise/fall, 40 dB on/off ratio
• Phase: 0 to 5 wheel
Internal Modulation Sources: Four fixed frequencies; optional AF synthesizer (SMX-B2) supports phase-continuous frequency change in less than 10 ms and external AF input at 1 V output level.
Memory: Nonvolatile storage for 40 complete setups
Power Supply: 230 V
– Key Features
• Low residual FM and SSB phase noise for spectral integrity
• Excellent suppression of non-harmonic spurious signals
• Precise frequency control via 10 Hz resolution across decade tuning
• Full modulation depth and deviation accuracy maintained during pulse modulation
– Typical Applications
Receiver in-channel and blocking measurements, RF transceiver development, component validation, production test environments.
– Compatibility & Integration
Standard AM and FM modulation inputs. Optional SMX-B1 oven-controlled reference oscillator enhances frequency accuracy; optional SMX-B2 AF synthesizer expands modulation source flexibility.
