The Rohde & Schwarz SMR40 is a high-performance microwave signal generator covering the frequency range of 10 MHz to 40 GHz. Designed for both laboratory and production environments, the SMR40 provides excellent spectral purity, fast switching times, and highly precise output levels. It can be easily upgraded from a standard CW generator with pulse modulation to a fully-featured AM/FM signal generator or vector-modulated upconverter, supporting a wide range of radar, EMC, and communication testing applications.
Specifications
Frequency
| Parameter | Value |
|---|---|
| Minimum Frequency | 10 MHz |
| Maximum Frequency | 40 GHz |
| Frequency Resolution | 1 kHz (0.1 Hz with option SMR-B9) |
Output
| Parameter | Value |
|---|---|
| Maximum Output Power | +9 dBm |
| Output Power Range | -20 dBm to +9 dBm (extendable to -130 dBm with optional step attenuator SMR-B17) |
| Phase Noise | <-103 dBc/Hz (typical -109 dBc/Hz) at 10 kHz offset, 10 GHz carrier |
Modulation
| Parameter | Value |
|---|---|
| Modulation | Pulse (standard); AM, FM, Phase modulation (optional SMR-B5) |
| Sweep Modes | Digital frequency sweep, Level sweep (standard); Analog ramp sweep (optional SMR-B4) |
General
| Parameter | Value |
|---|---|
| Reference Oscillator | 10 MHz standard TCXO (OCXO optional SMR-B1) |
| Interfaces | GPIB (IEEE 488.2) |
| Display | Monochrome LCD with backlight |
| Instrument Setup Memory | 50 complete instrument settings |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 90 V to 265 V AC, 47 Hz to 440 Hz |
| Dimensions (W×H×D) | 427 mm × 88 mm × 450 mm |
Frequency Specifications
| Parameter | Value |
|---|---|
| Frequency Switching Speed | < 10 ms |
Reference Oscillator
| Parameter | Value |
|---|---|
| Aging Rate (Standard TCXO) | < 1 x 10^-6 per year |
| Aging Rate (Optional OCXO SMR-B1) | < 5 x 10^-10 per day |
| External Reference Input Frequency | 10 MHz |
Amplitude Specifications
| Parameter | Value |
|---|---|
| Level Uncertainty (at 10 GHz) | < 0.9 dB |
| Output Impedance | 50 ohms |
| Output VSWR | < 2.0 (for frequencies > 2 GHz) |
Spectral Purity
| Parameter | Value |
|---|---|
| Harmonics | <-30 dBc (for frequencies > 2 GHz) |
| Subharmonics (f > 20 GHz) | <-50 dBc |
Analog Modulation
| Parameter | Value |
|---|---|
| Pulse Modulation On/Off Ratio | > 80 dB |
| Pulse Modulation Rise/Fall Time | < 10 ns (typical 5 ns) |
| Pulse Modulation Minimum Pulse Width | 50 ns |
| AM Depth Range (Option SMR-B5) | 0% to 90% |
| Phase Modulation Max Deviation | 100 rad (at 10 GHz carrier) |
Sweep and Operating Modes
| Parameter | Value |
|---|---|
| Number of Sweep Points | 2 to 65535 |
System Connectivity and Interfaces
| Parameter | Value |
|---|---|
| RF Output Connector Type | 2.92 mm female (K-type) |
| Remote Control Language | SCPI |
Physical and Environmental Specifications
| Parameter | Value |
|---|---|
| Operating Temperature Range | 0 °C to +55 °C |
| Storage Temperature Range | -40 °C to +70 °C |
| Rack Unit (RU) Height | 2 HU |
Power Requirements
| Parameter | Value |
|---|---|
| Power Consumption | 150 W (typical) |
Compliance and Standards
| Parameter | Value |
|---|---|
| Recommended Calibration Cycle | 3 years |
Hardware and Software Options
| Parameter | Value |
|---|---|
| Option SMR-B1 | OCXO Reference Oscillator |
| Option SMR-B4 | Option SMR-B11 |
| Option SMR-B5 | AM/FM/Phase Modulation/Log AM Modulator |
| Option SMR-B9 | High Frequency Resolution (0.1 Hz) |
| Option SMR-B11 | Option SMR-B14 |
| Option SMR-B17 | Step Attenuator (for SMR40) |
| Option SMR-B23 | IF Upconverter (up to 40 GHz) |
LF Generator (Option SMR-B5)
| Parameter | Value |
|---|---|
| LF Generator Frequency Range (Sine) | 0.1 Hz to 10 MHz |
| LF Generator Frequency Range (Other Waveforms) | 0.1 Hz to 1 MHz (square, triangle, sawtooth) |
| LF Generator Waveforms | sine, square, triangle, sawtooth |
| LF Generator Frequency Resolution | 0.1 Hz |
Pulse Generator (Option SMR-B14)
| Parameter | Value |
|---|---|
| Pulse Generator Period Range | 100 ns to 85 s |
| Pulse Generator Pulse Width Range | 10 ns to 1 s |
| Pulse Generator Resolution | 10 ns |
| Pulse Generator Operating Modes | single pulse, double pulse, delayed pulse, external trigger, external gate |
Reference Frequency
| Parameter | Value |
|---|---|
| Internal Reference Output Frequency | 10 MHz |
| Internal Reference Output Level | approx. 1 V (rms) into 50 Ω |
Analog Ramp Sweep (Option SMR-B11)
| Parameter | Value |
|---|---|
| Analog Ramp Sweep Sweep Time Range | 10 ms to 100 s |
Sweep
| Parameter | Value |
|---|---|
| Sweep Trigger Modes | auto, single, external, manual |
RF Attenuator (Option SMR-B23)
| Parameter | Value |
|---|---|
| Attenuator Range | 0 dB to 110 dB (with Option SMR-B17) |
| Attenuator Step Size | 10 dB (with Option SMR-B17) |
Phase Noise
| Parameter | Value |
|---|---|
| SSB Phase Noise at 10 GHz (10 kHz offset) | <-83 dBc/Hz (typical -89 dBc/Hz) |
Rear Panel Connectors (Option SMR-B19)
| Parameter | Value |
|---|---|
| Option SMR-B19 Description | Moves RF output and all modulation inputs/outputs to the rear panel |
Options
| Parameter | Value |
|---|---|
| Option SMR-B12 Description | High Output Power for SMR27, SMR30, and SMR40 |
| Option SMR-B14 Description | Pulse Generator |
LF Generator
| Parameter | Value |
|---|---|
| LF Generator Output Amplitude Range | 10 mV to 1 V (into 50 ohm), 10 mV to 2 V (open circuit) |
| LF Generator Output Impedance | 50 ohm |
Technology
Synthesized Microwave Signal Generation
Applications
Radar testing, scalar network analysis, EMC testing, microwave component characterization, vector signal upconversion