SMR27

The Rohde & Schwarz SMR27 is a high-performance microwave signal generator designed for applications in production, research, and development. Operating over a frequency range of 10 MHz to 27 GHz, the SMR27 provides standard pulse modulation alongside optional AM, FM, phase modulation, and an analog ramp sweep. Featuring excellent spectral purity, a compact 2 HU form factor, and a 3-year calibration cycle, it serves as an ideal CW generator, sweep generator, or tracking generator.

Microwave RF and Microwave Signal Generation

Specifications

Frequency

Parameter	Value
Minimum Frequency	10 MHz
Maximum Frequency	27 GHz
Frequency Resolution	1 kHz (0.1 Hz with option R&S SMR-B3)

Output

Parameter	Value
Maximum Output Power	+11 dBm (f <= 20 GHz); +9 dBm (f > 20 GHz)
Output Power Range	-20 dBm to +11 dBm (f <= 20 GHz, standard; +9 dBm for f > 20 GHz); -130 dBm to +11 dBm (with option R&S SMR-B9; +9 dBm for f > 20 GHz)
Phase Noise	<-83 dBc/Hz (typical -89 dBc/Hz) at 10 kHz offset (10 GHz carrier)

Modulation

Parameter	Value
Modulation	Pulse (standard); AM, FM, Phase Modulation (with option R&S SMR-B5)
Sweep Modes	Digital frequency and level sweep (standard); Analog ramp sweep (with option R&S SMR-B4)

General

Parameter	Value
Reference Oscillator	TCXO (standard); OCXO (with option R&S SMR-B1)
Interfaces	GPIB (IEEE-488), RS-232
Display	Backlit monochrome LCD (240 x 64 pixels)
Instrument Setup Storage	50 complete instrument setups
Warm-up Time	approx. 10 min / 30 min (with Option SMR-B1)

Physical

Parameter	Value
Power Supply	90 V to 264 V AC, 47 Hz to 440 Hz
Dimensions (W×H×D)	427 mm x 88 mm x 450 mm
Weight	< 12 kg (without options)

Frequency Specifications

Parameter	Value
Frequency Range	10 MHz to 27 GHz
Frequency Settling Time	< 10 ms
Aging per Year	< 1 x 10^-6 (standard TCXO); < 1 x 10^-7 (with option R&S SMR-B1 OCXO)
Temperature Coefficient of Reference	< 2 x 10^-6 (0 °C to 55 °C, standard); < 5 x 10^-9 (with option R&S SMR-B1)
External Reference Input Frequency	10 MHz
External Reference Input Level	0.2 V to 2 V (RMS)
Internal Reference Output Frequency	10 MHz
Internal Reference Output Level	approx. 1 V (RMS) into 50 ohms

Level Specifications

Parameter	Value
Maximum Output Level (Without Attenuator)	+11 dBm (f <= 20 GHz); +9 dBm (f > 20 GHz)
Minimum Output Level (Without Attenuator)	-20 dBm
Minimum Output Level (With Attenuator)	-130 dBm (with option R&S SMR-B9)
Maximum Output Level (With Attenuator)	+11 dBm (10 MHz to 20 GHz); +9 dBm (20 GHz to 27 GHz)
Level Resolution	0.01 dB
Level Accuracy (high levels)	< 0.9 dB (level > -10 dBm, f <= 20 GHz); < 1.2 dB (level > -10 dBm, f > 20 GHz)
Level Accuracy (low levels)	< 0.9 dB (level > -90 dBm, f <= 20 GHz); < 1.2 dB (level > -90 dBm, f > 20 GHz)
Level Settling Time	< 20 ms
Output Impedance	50 ohms
Maximum Safe Reverse Power (RF)	1 W (f <= 20 GHz); 0.5 W (f > 20 GHz)
Maximum Safe Reverse Power (DC)	0 V

Spectral Purity

Parameter	Value
Harmonics (at specified output level)	<-30 dBc (at levels <= +8 dBm)
Subharmonics	none (f <= 20 GHz); <-50 dBc (f > 20 GHz)
Non-Harmonic Spurious (at carrier offset)	<-55 dBc (for > 10 kHz offsets, carrier <= 20 GHz)
SSB Phase Noise (10 GHz carrier, 10 kHz offset)	<-83 dBc/Hz (typically -89 dBc/Hz)
SSB Phase Noise (10 GHz carrier, 100 kHz offset)	<-103 dBc/Hz (typically -109 dBc/Hz)
Wideband Noise Floor	<-135 dBc/Hz (typically <-140 dBc/Hz)

Pulse Modulation

Parameter	Value
Pulse Modulation On/Off Ratio	> 80 dB
Pulse Rise/Fall Time	< 10 ns (typically < 5 ns)
Minimum Pulse Width	50 ns

Pulse Generator (Option R&S SMR-B14)

Parameter	Value
Pulse Generator Modes	Single pulse, double pulse, delayed pulse, gated
Pulse Period Range	100 ns to 100 s
Pulse Period Resolution	10 ns or 5 digits
Pulse Width Range	20 ns to 100 s
Pulse Width Resolution	10 ns or 5 digits
Pulse Delay Range	40 ns to 100 s
Pulse Delay Resolution	10 ns or 5 digits
Double Pulse Spacing	40 ns to 100 s

Amplitude Modulation (Option R&S SMR-B5)

Parameter	Value
Modulation Depth Range	0% to 90%
AM Modulation Frequency Range	10 Hz to 50 kHz
AM Depth Accuracy	< 4% of setting + 1% (at 1 kHz, depth <= 80%)
AM Distortion	< 2% (at 1 kHz, 30% depth)
AM Input Impedance	100 kohms

Frequency Modulation (Option R&S SMR-B5)

Parameter	Value
Maximum Deviation	up to 8 MHz (carrier frequency dependent)
FM Modulation Frequency Range	10 Hz to 1 MHz
FM Deviation Accuracy	< 5% at 1 kHz
FM Input Impedance	100 kohms

Phase Modulation (Option R&S SMR-B5)

Parameter	Value
Maximum Phase Deviation	up to 80 rad (carrier frequency dependent)
Phase Modulation Frequency Range	10 Hz to 100 kHz
Phase Deviation Accuracy	< 5% at 1 kHz
Phase Modulation Input Impedance	100 kohms

Sweep Capabilities

Parameter	Value
Sweep Type (Frequency / Level / LF)	Frequency, Level, LF (with option R&S SMR-B5)
Sweep Modes (Step / Ramp)	Digital step sweep (standard); Analog ramp sweep (with option R&S SMR-B4)
Dwell Time Range	1 ms to 10 s (digital sweep)
Sweep Trigger Sources	Automatic, single, manual, external

Rear Panel and Control Interfaces

Parameter	Value
RF Output Connector Type	PC 2.92 mm male
GPIB Interface (IEEE-488)	Yes, IEEE-488.2 compatible
RS-232 Interface	Yes, 9-pin D-Sub
Reference Input/Output Connectors	BNC female, rear panel

Hardware Options and Configurations

Parameter	Value
Electronic/Mechanical Attenuator Option	Mechanical RF Attenuator (Option R&S SMR-B9)
Pulse Modulator Option	Standard pulse modulator included
Pulse Generator Option	Option R&S SMR-B14
Fine Frequency Resolution Option	Option R&S SMR-B3 (0.1 Hz resolution)
Analog Ramp Sweep Option	Option R&S SMR-B11
AM/FM/PhiM Modulator Option	Option R&S SMR-B5
High-Stability OCXO Option	Option R&S SMR-B1
Rear Panel Connectors Option	Option R&S SMR-B19

Power and Physical Characteristics

Parameter	Value
AC Input Voltage Range	90 V to 264 V AC
AC Input Frequency Range	47 Hz to 440 Hz
Power Consumption	approx. 120 W (without options)
Dimensions (W x H x D)	427 mm x 88 mm x 450 mm
Display Type and Resolution	Backlit monochrome LCD graphics display, 240 x 64 pixels
Rackmount Form Factor Compatibility	2 HU (Height Units), 19-inch rack-mountable

Environmental and Compliance

Parameter	Value
Operating Temperature Range	0 °C to +55 °C
Storage Temperature Range	-40 °C to +70 °C
Recommended Calibration Interval	3 years

Interfaces & Programming

Parameter	Value
Command Set	SCPI

Environmental

Parameter	Value
Operating Altitude Limit	4600 m
Storage Altitude Limit	12000 m
Vibration Resistance	5 Hz to 55 Hz, 0.15 mm amplitude (complies with IEC 60068-2-6)
Permissible Relative Humidity	95% at +40 °C (non-condensing)

Compliance

Parameter	Value
EMC Standards	Complies with EN 55011 Class B and EN 61326
Safety Standards	Complies with EN 61010-1

LF Generator (Option SMR-B5)

Parameter	Value
LF Generator Frequency Range	10 Hz to 1 MHz (with Option SMR-B5)
LF Generator Frequency Resolution	0.1 Hz (with Option SMR-B5)
LF Generator Waveforms	Sine, square (with Option SMR-B5)
LF Generator Output Voltage Range	1 mV to 1 V (Vp, peak, open circuit, with Option SMR-B5)

Analog Ramp Sweep (Option SMR-B11)

Parameter	Value
Analog Sweep Time Range	10 ms to 100 s (with Option SMR-B11)
Analog Sweep Span	10 MHz to full frequency range (with Option SMR-B11)

Options

Parameter	Value
SMR-B3 Fine Frequency Resolution	0.1 Hz
SMR-B17 RF Attenuator Range	0 dB to 110 dB
SMR-B17 RF Attenuator Step Size	10 dB

Control & Programming

Parameter	Value
Compatible Emulation Modes	HP 83732, HP 8360, HP 8340, HP 8673, HP 8662, HP 8663, Rohde & Schwarz SMP/SME/SMY

Sweep

Parameter	Value
Number of Sweep Steps	2 to 65535

Technology

Synthesized Microwave Signal Generator

Applications

Radar and EMC testing, scalar network analysis tracking generator, microwave synthesizer, local oscillator, upconversion of digitally modulated IF signals