Atec Rohde-Schwarz-SMR Series - Manual (Page 3)

Microwave Signal Generator ¸SMR 3
Memory
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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
four models have a common lower fre-
quency limit of 1 GHz and provide fre-
quency 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).
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 afford-
able 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 sig-
nal generator or a synthesized sweep
generator featuring fast, fully synthe-
sized, 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 sup-
pression, both of which are for example
prerequisites for reliable receiver mea-
surements. 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-precision output level
Microwave signal generators are fre-
quently used for calibrating test receivers.
This task calls for a highly accurate and
stable output level settable with high reso-
lution. 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.
Stable output frequency
The crystal reference built in as standard
ensures an accurate, low-drift output fre-
quency. The ¸SMR can be fitted with
the optional OCXO Reference Oscillator
¸SMR-B1 to satisfy the most strin-
gent requirements in terms of accuracy
and aging.
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-
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.
Application-oriented frequency resolution
The standard frequency resolution of
1 kHz of the ¸SMR offers a comfort-
able margin for most applications, for
example frequency response measure-
ments in the laboratory and in production
and servicing. To satisfy more stringent
requirements, e.g. for scientific applica-
tions and research, the ¸SMR-B3
option is available to improve frequency
resolution to 0.1 Hz.
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.
These guaranteed values illustrate that
the ¸SMR is the ideal generator for
use in the development, production and
maintenance of radar equipment.
CW, signal or synthesized sweep generator
SSB phase noise at 10 GHz
10 Hz 100 Hz 1 kHz 10 kHz 100 kHz 1 MHz
2 4 6 8 2 4 6 8 2 4 6 8 2 4 6 8 2 4 6 8
–40.0
–50.0
–60.0
–70.0
–80.0
–90.0
–100.0
–110.0
–120.0
–130.0
–140.0
dBc (1 Hz)