The Rohde & Schwarz SMHU is a synthesized signal generator delivering precise signal generation across 100 kHz to 4.32 GHz, with capability to supply frequencies down to 1 kHz. Built for radio communications testing, research, development, and production environments, the SMHU combines exceptional spectral purity with versatile modulation and sweep capabilities. Its 0.1 Hz frequency resolution and sub-10 ms frequency setting time enable rapid, accurate signal development for adjacent-channel, in-channel, and out-of-channel measurements.
Technical Specifications
• Frequency range: 100 kHz to 4.32 GHz (down to 1 kHz capability)
• Frequency resolution: 0.1 Hz
• Frequency setting time: <10 ms standard; <1 ms in fast mode (up to 200 user-defined frequencies with trigger or memory sweep)
• Output level: −140 dBm to +13 dBm
• Phase noise: Extremely low across full frequency range; maintains low phase noise right to carrier
• Time base: OCXO (Oven Controlled Crystal Oscillator)
• Phase offset: 10° step resolution via keyboard or spinwheel entry
– Key Features
Modulation Support
• AM with modulation frequency range usable at carrier frequencies below 100 kHz; minimal phase shift at 30 Hz (AM DC); flat frequency response
• FM with DC to 1 MHz modulation frequency range; FM DC capability for FSK; high carrier-frequency accuracy and extremely small frequency offset in FM DC mode
• Phase modulation
• Pulse modulation: 20 ns typical rise/fall times (<10 ns above 200 MHz); 80 dB on/off ratio
• Digital modulation (SMHU58 variant): Broadband I/Q modulator, DC to 200 MHz modulation bandwidth; optional coders for DECT, NADC/PDC, PHS, CDMA, TETRA25; IQSIM-K software for user-programmable waveforms
Sweep Capabilities
• Digital and analog sweep modes
• RF, AF, level, and memory sweeps
– Typical Applications
• Local oscillator (LO) generation
• Low-noise reference source for noise measurement systems
• CEPT spurious rejection testing of radiotelephone equipment to 4 GHz
• Complex modulation signal generation for communications standards
– Compatibility & Integration
The SMHU58 variant incorporates an extremely broadband I/Q modulator, extending digital modulation versatility across PSK, QAM, and ASK schemes.
