69 / 164 
3
4
5
6
69
TELE-audiovision.com—
05-06/2015 —
TELE-audiovision International —
全球发行量最大的数字电视杂志
for my test from Eutelsat 5 West
A. The transponder is used
by Fransat, a French bouquet
that transmits with Viaccess
encryption.
5. Recording is started and
terminated manually. I normally
record 1 minute, sometimes 5
minutes. If you do recordings
shorter than 1 minute, you
will find that the contained
transport stream gets looped
too quickly and you don’t have
enough time on the receiver
to make the required tests. A
side note: the StreamXpress
software can loop the transport
stream file automatically,
but naturally there is an
interruption with each loop,
as the tuner must wait for new
headers. This takes about 3
seconds and can be annoying
with too small transport stream
files.
6. Once the recording is
terminated you can start
StreamXpress, select the file
you just created and output
a transponder. The picture
shows the image grabbed
from the official Fransat
satellite receiver next to the
StreamXpress window.
perfekten Synchronisation
ein externes 10 MHz Signal
zu verwenden. Auch hier
glänzt die DTA-2115, denn
es stehen zwei 50 Ohm BNC
Buchsen als Eingang für
ein 10 MHz / 1pps Signal
zur Verfügung. Dies kann
zum Beispiel für Tests in
SFN Netzen wichtig sein, in
welchen verschiedene An-
tennen synchron auf glei-
cher Frequenz ausstrahlen.
Damit wird die DTA-2115
auch für Broadcastingan-
wendungen
interessant;
sie unterstützt einen Fre-
quenzbereich von 32MHz
bis 2186MHz, die Symbol
Rate kann von 0.088MBd bis
85MBd eingestellt werden.
Die maximale Bandbreite
beträgt 72 MHz.
Die DTA-2115 wird in zwei
Versionen ausgeliefert, wo-
bei die Hardware in beiden
Fällen die gleiche ist – ledig-
lich die mitgelieferten Lizen-
zen unterscheiden sich.
Die DTA-2115-SP unter-
stützt folgende Modulatio-
nen: ADTB-T, ATSC, DVB-
C, DVB-H, DVB-S, DVB-S2,
How to
capture a
Transport Stream
1. One way to obtain a transport
stream is to simply record
one. This is what most users
want to do anyway, because
such a transport stream is
required to test or demonstrate
a receiver with authentic
data. To grab a transport
stream I used the EBSpro
software, which is popular
amongst DX enthusiasts. The
first step consists in tuning
to the desired satellite and
polarisation and do a spectrum
scan.
2. Next just double click on
the preferred transponder.
The Signal Analyser will try
to automatically tune into the
signal and upon success it will
show all reception parameters.
3. EBSpro even features an
integrated TS Analyser, which
shows all services available
in the transport stream of the
current locked transponder.
4. Further options include the
visualization of the stream with
VLC or TSReaderPro, which are
certainly familiar tools within
our readers. Also, you can just
use the TS Grabber option. This
simply writes the transport
stream to a file: exactly what
we need. In this case I am
recording a transport stream