The Rohde & Schwarz SMG is a compact signal generator spanning 100 kHz to 1 GHz, engineered for component testing, receiver validation, and signal simulation. It delivers pulse modulation with exceptional on/off ratios exceeding 70 dB, standard AM/FM/phase and FSK capabilities, and phase noise of typically –124 dBc at 1 GHz with 20 kHz offset. The instrument combines high spectral purity, fast frequency switching, and output control from –140 dBm to +13 dBm, making it suitable for demanding RF/microwave labs and production environments.
Technical Specifications
Frequency
• Range: 100 kHz to 1 GHz
• Resolution: 1 Hz
• Switching time: 15 ms
• Time base stability: 0.000002 /yr
• Reference: Internal 10 MHz or 5 MHz crystal oscillator; optional OCXO (SMG-B1) available
• External reference input: 10 MHz or 5 MHz
Output
• Power range: –140 dBm to +13 dBm
• Accuracy: ±1.5 dB
• Impedance: 50 Ohm
• Level switching time: 25 ms
• Overload protection: 50 W maximum permissible RF power
Modulation
• Pulse modulation: External TTL-compatible input; on/off ratio >70 dB (typically >80 dB); rise/fall times 10–90% typically 20 ns above 200 MHz; PRF 0–10 MHz
• Standard modes: AM, FM, phase, FSK, two-tone
• Internal modulation source (option SMG-B2): AF Synthesizer, 10 Hz to 100 kHz
Spectral Performance
• Spurious signals: <−30 dBc (SMGL, level ≤27 dBm)
• Harmonics: <−30 dBc (SMGL, level ≤27 dBm)
• Phase noise: –124 dBc @ 1 GHz, 20 kHz offset
– Key Features
• TTL pulse modulation with 70+ dB blanking ratio and 20 ns edge speeds
• N-type 50 Ohm RF output with integrated overload protection
• Frequency resolution to 1 Hz; 15 ms carrier switching
• Low phase noise and spurious content for precision measurement
• Programmable sweep modes: auto, linear, manual, single
• Test pattern storage for up to 5 configurations
– Typical Applications
• RF component and subsystem characterization
• Receiver sensitivity and selectivity testing
• Signal simulation for system validation
• Pulse modulation studies and radar signal generation
– Compatibility & Integration
• IEC bus remote control interface
• Modulation inputs: BNC connectors (100 kΩ or 600 Ω input impedance)
• AF output available with SMG-B2 option
• 19" rack-mount adapter option
• Optional OCXO (SMG-B1) for improved frequency accuracy
