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05-06/2015 —

TELE-audiovision International —


for my test from Eutelsat 5 West

A. The transponder is used

by Fransat, a French bouquet

that transmits with Viaccess


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


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


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:



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


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