Atec Rohde-Schwarz-SMR Series - Manual (Page 4)

4 Microwave Signal Generator ¸SMR
Pulse generator option
The optional Pulse Generator
¸SMR-B14 is an ideal complement to
the pulse modulator. It generates single
and double pulses with pulse frequencies
up to 10 MHz. The pulse generator can
also be triggered externally and operated
in the external gate mode. The pulse
width and delay are user-selectable over
a wide range.
Digital frequency and level sweeps
The digital frequency sweep with step
times from 10 ms allows convenient
frequency response measurements on
microwave circuits. The start and stop
frequencies are user-selectable. A trigger
input enables synchronous operation
with external equipment.
The 20 dB level sweep allows, for exam-
ple, amplifier or mixer compression to be
determined.
The signal generator
AM/FM/Scan modulator option
The optional AM/FM/Scan Modulator
¸SMR-B5 added to the base models
turns them into fully-fledged signal
generators with AM and FM modulation
capability. The option also includes an LF
generator for sinewave and squarewave
signals from 0.1 Hz to 10 MHz.
FM and FSK
The FM modulator has a modulation
bandwidth from DC to 5 MHz. Digital fre-
quency shift keying (FSK) is possible with
data rates from 0 Hz to 2 MHz.
Simultaneous modulation modes
All modulation modes of the ¸SMR
can be combined. This allows the genera-
tion of complex modulation signals for
modern communication and location sys-
tems. The combination of pulse modula-
tion and FM simulates Doppler effects or
chirp signals. Simultaneous AM and
pulse modulation provides the types of
signal occurring in pulse radar applica-
tions with rotating antenna. The combi-
nation of FM and AM can be used to
check fading effects of FM receivers.
Typical max. output level as a function of frequency (with the options ¸SMR-B15 and
¸SMR-B17)
0.01 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
4
6
8
10
12
14
16
18
20
22
24
P in dBm
f in GHz
¸SMR 20
¸SMR 27/30/40
¸SMR 27/30/40
¸SMR 30/40
¸SMR 40
-3 dB
-60 dB
X output
X input
Spectrum or scalar network analyzer
DUT
600 MHz/ms
–60 dB
600 MHz/ms
–3 dB
Network analysis with the ¸SMR as a
synthesized sweep generator