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DATA
TECHNICAL
Manufacturer
DekTec Digital Video B.V., Van Riebeeckweg 43A,
1212 EH Hilversum, The Netherlands
Email sales
info@dektec.com
Internet
www.dektec.com
Model
DTU-215 Gold Edition
Function
USB 2.0 digital VHF/UHF Modulator
Frequency range
47 . . 1000 MHz (+/- 1ppm)
Bandwidth
2.7 .. 8 MHz
Modulations
ATSC VSB, ADTB-T/DTMB, CMMB, DVB-C, DVB-C2
DVB-T/DVB-H, DVB-T2, ISDB-T, QAM
MER (OFDM)
> 42dB
RF Connector
75 Ohm (F)
Return loss
15dB (47 .. 862 MHz)
Level (QAM)
-46 .. -15dBm (+/-2 dB)
Level (OFDM)
-49 .. -18dBm (+/-2 dB)
Amplitude Step Size
0.5dB
Adjacent Channel
-54dB (QAM), -52dB (OFDM)
Phase Noise
< -95dBc @ 10kHz
Spectral Purity
> 50dB ( 47 .. 1000MHz)
USB Port
USB 2.0
Power (through USB 2.0)
5V, 500mA
Dimensions
123 x 62 x 22 mm
+
–
Thomas Haring
TELE-satellite
Test Center
Austria
16
17
145
www.TELE-satellite.com —
12-01/2012 —
TELE-satellite International — The World‘s Largest Digital TV Trade Magazine
The DekTec DTU-215 is a professional signal
modulator for nearly every digital modula-
tion standard via satellite, terrestrial or cable.
Thanks to the multifaceted Stream Player
Software, it makes an exceptional test instru-
ment and can also be used for demonstration
purposes.
No information is provided on which of the many drivers
stored on the included USB stick are actually for use with
the modulator
Expert Opinion
a test signal in any of the
modulation standards as
well as an AWGN (Additive
White Gaussian Noise) sig-
nal. If you introduce this
AWGN signal to the actual
signal and manipulate its
amplitude according to a
Gauss curve, you can model
what would happen to the
original signal if it should get
disturbed by white noise.
During our tests we were
quite surprised at the high
efficiency of the modula-
tor and the relatively small
load it placed on the PC.
We were able to modulate
a transport stream with five
TV channels and multiple
radio channels along with
all of the additional services
and display them on a TV
via DVB-T.
It became interesting
though when we tried to
take an HDTV transpon-
der with a total of three HD
channels and modulate it in
DVB-T2. It was easy to see
that the USB 2.0 port was
at the limits of its capabili-
ties. But if you reduce the
number of HD channels in
the transport stream, it can
be processed without any
problems.
The DekTec DTU-215 is
available from the manufac-
turer in two versions: While
the DTU-215 Gold Edition
can handle every possible
modulation including future
versions and can simulate
a complex signal distribu-
tion network plus generate
an AWGN signal, these op-
tions are not available in the
DTU-215 SP nor are some
of the modulations (ISDB-T,
CMMB, DTMB).
If you have sufficient pro-
gramming experience, you
can develop your own soft-
ware with the help of the
C++ API available for down-
load from the manufacturer
that would access the at-
tached hardware through
the DekTec drivers.
This would seem to be a
good time to point out that
DekTec offers not only Win-
dows drivers but Linux driv-
ers as well although the
matching modulator control
software is not yet available
for Linux; the user must de-
velop it themselves using
the C++ API.