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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.
perfect synchronization. The
DTA-2115 also shines bright-
ly here; there are two 50-
Ohm BNC connectors avail-
able to provide 10 MHz/1pps
input signals. This could be
important, for example,
when testing SFN networks
where different antennas
transmit synchronously on
the same frequency. This
makes the DTA-2115 also
interesting for use in broad-
casting applications; it sup-
ports a frequency range of
32 MHz to 2186 MHz and the
symbolrate can be set from
0.088MBd to 85MBd. It has
a maximum bandwidth of 72
MHz.
The DTA-2115 is available
in two different versions; the
hardware in both versions is
the same, just the included
licenses are different.
The DTA-2115-SP supports
the following modulations:
ADTB-T, ATSC, DVB-C, DVB-
H, DVB-S, DVB-S2, DVB-T,
QAM-B and QAM-C.
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