Atec Rohde-Schwarz-SMA100A - Manual (Page 9)

DME
transponder
Antenna
Coupler 20 dB Coupler 20 dB
Replay delay 50 μs/56 μs
¸SMA100A
Reply pulses from
DME transponder
¸NRP trigger out
t
Interrogation pulses
from ¸SMA100A
t
Video out
¸NRP trigger
t
Video out
50 μs/56 μs
¸NRP-Z81
t
t
20 dB 20 dB
Automatic DME pulse measurement with
the R&S®SMA-K28 pulse analysis option.
Rohde & Schwarz R&S®SMA100A Signal Generator 9
The R&S®SMA100A offers internal (linear) chirp generation
up to an 80 MHz chirp bandwidth without the need for
external synchronization. Frequency and pulse modulation
are synchronized internally. This feature can be used in
radar applications, for example.
When equipped with the R&S®SMA-K25 option, the
R&S®SMA100A can generate avionics signals (VOR/ILS) in
accordance with ICAO standards. Due to its low modula-
tion error and very high level accuracy, the R&S®SMA100A
is the optimal high-precision VOR/ILS signal source for
testing avionics receivers.
The R&S®SMA100A signal generator, together with the
R&S®SMA-K26 DME modulation option, lets the user cre-
ate standard-compliant distance measurement equipment
(DME) signals. The user can easily create the DME interro-
gation signal (simulation of an airplane interrogator) or the
ground station’s response signal and test the components
or DME receiver in a flexible manner.
The R&S®NRP-Z81 wideband power sensor can also be
connected directly to the R&S®SMA100A signal generator
to analyze DME signals. This provides a convenient way to
measure the reply delay and reply efficiency of the ground
station or the DME average peak power and pulse repeti-
tion rate.
Test setup for DME analysis