Atec SMR User Manual
Data sheet
Version
05.00
June
2004
Microwave Signal Generator ¸SMR
High-performance, cost-effective and reliable up to 40 GHz
◆ Instrument family with four models
– ¸SMR20 (10 MHz to 20 GHz)
– ¸SMR27 (10 MHz to 27 GHz)
– ¸SMR30 (10 MHz to 30 GHz)
– ¸SMR40 (10 MHz to 40 GHz)
◆ Standard version:
CW generator with pulse modulation
and digital frequency sweep
◆ Easily upgradeable to AM/FM signal
generator and synthesized sweep
generator with analog ramp sweep
owing to flexible options concept
◆ Optional pulse generator for radar
and EMC applications
◆ Optional IF input for upconversion of
digitally modulated IF signals
◆ Compact, lightweight, user-friendly:
ideal in the lab and for field
applications
◆ 3-year calibration cycle
The allrounder – designed for future-proofness
Ease of operation
◆ High-contrast LC display
◆ Online help including IEC/IEEE-bus
commands
◆ Simple and self-explanatory settings
◆ User-assignable keys
◆ One-hand operation with EasyWheel
Wide frequency range
◆ ¸SMR20 (1 GHz to 20 GHz)
◆ ¸SMR27 (1 GHz to 27 GHz)
◆ ¸SMR30 (1 GHz to 30 GHz)
◆ ¸SMR40 (1 GHz to 40 GHz)
◆ Optional extension of lower frequency
limit to 10 MHz (¸SMR-B11)
◆ Frequency resolution 1 kHz,
optional 0.1 Hz (¸SMR-B3)
High output power
◆ ¸SMR20 >+10 dBm (at 20 GHz)
◆ ¸SMR27
◆ ¸SMR30/40
(at 30/40 GHz)
>+11 dBm (at 27 GHz)
>+9 dBm
High-precision level control
◆ High-precision, frequency-response-
compensated level control
◆ Setting range extendible to
−130 dBm by means of the optional
RF Attenuator ¸SMR-B15/-B17
Three instruments in one
◆ CW generator with pulse modulation
capability (standard version)
◆ Signal generator with AM/FM and
LF generator (option ¸SMR-B5)
◆ Synthesized sweep generator with
analog ramp sweep
(option ¸SMR-B4)
Optional pulse generator
(¸SMR-B14)
◆
Operating modes: single pulse, double
pulse, externally triggered, gate mode
◆ Pulse repetition 100 ns to 85 s
◆ Pulse width 20 ns to 1 s
Sweep capabilities
◆ Digital RF and level sweep
(standard version)
◆ Analog ramp sweep
(RF sweep, option ¸SMR-B4)
◆ Max. sweep rate for ramp sweeps
min. 600 MHz/ms
(frequency >2GHz)
◆ Digital sweep of LF generator
(with option ¸SMR-B5)
◆ 10 user-selectable frequency
markers for RF sweep
◆ Operating modes: automatic, single-
shot, manual, externally triggered
Optional IF input
(¸SMR-B23/-B24/-B25)
◆ Built-in upconverter for digitally
modulated IF signals (¸SMR-B23/
-B24: DC to 700 MHz, ¸SMR-B25:
40 MHz to 6 GHz for ¸SMR20
only)
◆ Ideal for use with Vector Signal
Generator ¸SMIQ and
I/Q Modulation Generator ¸AMIQ
2 Microwave Signal Generator ¸SMR
CW, signal or synthesized sweep generator
Memory
◆ Space for 50 complete instrument
setups
The CW generator
The ¸SMR family comprises four
base models designed as CW generators
with pulse modulation capability. The
High-precision output level
Microwave signal generators are frequently used for calibrating test receivers.
This task calls for a highly accurate and
stable output level settable with high resolution. This is ensured by a high-precision,
frequency-response-compensated level
control for levels higher than –20 dBm. The
setting range can be extended to –130 dB
with the optional RF Attenuator
¸SMR-B15 or ¸SMR-B17.
Application-oriented frequency resolution
The standard frequency resolution of
1 kHz of the ¸SMR offers a comfortable margin for most applications, for
example frequency response measurements in the laboratory and in production
and servicing. To satisfy more stringent
requirements, e.g. for scientific applications and research, the ¸SMR-B3
option is available to improve frequency
resolution to 0.1 Hz.
four models have a common lower frequency limit of 1 GHz and provide frequency coverage up to 20 GHz
(¸SMR20), 27 GHz (¸SMR27),
30 GHz (¸SMR30) and 40 GHz
(¸SMR40). The lower limit can be
expanded to 10 MHz by the optional
Frequency Extension 0.01 GHz to 1 GHz
(¸SMR-B11).
Stable output frequency
The crystal reference built in as standard
ensures an accurate, low-drift output frequency. The ¸SMR can be fitted with
the optional OCXO Reference Oscillator
¸SMR-B1 to satisfy the most stringent requirements in terms of accuracy
and aging.
Pulse modulator included
Pulse modulation is still the most impor-
tant modulation mode for microwave
applications. Each of our base units is,
therefore, equipped with a high-quality
pulse modulator. The on/off ratio is better
than 80 dB, the rise/fall time shorter than
12 ns. Pulse widths of up to 25 ns are
possible.
Offering an excellent price/performance
ratio, each of the four base models is
ideal for the user wishing to enter the
field of microwave testing at an affordable price. Should the measurement
tasks become more demanding, the base
models can be upgraded any time by
means of options to give an AM/FM signal generator or a synthesized sweep
generator featuring fast, fully synthesized, analog ramp sweep.
Excellent spectral purity
The ¸SMR stands out from other
generators for its excellent spectral
purity. Advanced frequency synthesis
with fractional-N divider makes for low
SSB phase noise and high spurious suppression, both of which are for example
prerequisites for reliable receiver measurements. Modern microwave filters in
the output path of the instrument ensure
excellent harmonics suppression. This is
necessary to obtain conclusive results in
scalar network analysis measurements.
High output level saves you real cash
All microwave test setups involve high
losses caused by the use of long cables,
power dividers, directional couplers and
RF relays. Expensive microwave amplifi-
These guaranteed values illustrate that
the ¸SMR is the ideal generator for
use in the development, production and
maintenance of radar equipment.
ers are usually the only means to remedy
this. But not with the ¸SMR: the high
output power provided by all models
eliminates the need for such a costly
component.
dBc (1 Hz)
–40.0
–50.0
–60.0
–70.0
–80.0
–90.0
–100.0
–110.0
–120.0
–130.0
–140.0
2 4 68 2 4 68 2 4 68 2 4 68 2 4 68
10 Hz 100 Hz 1 kHz 10 kHz 100 kHz 1 MHz
SSB phase noise at 10 GHz
Microwave Signal Generator ¸SMR 3
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