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70 TELE-audiovision International — The World‘s Leading Digital TV Industry Publication — 05-06/2015 —
With the DTA-2115-GOLD
that we tested, the following
modulations are possible:
ADTB-T, ATSC, ATSC-M/H,
CMMB, DAB(+), DMB-T/H,
DVB-C, DVB-C2, DVB-H,
DVB-S, DVB-S2, DVB-S2X,
DVB-T, DVB-T2, I/Q, ISDB-
S, ISDB-T, QAM-B, QAM-C,
and T-DMB.
All of the available modu-
lation types can be set to
any desired frequency. You
can, for example, take a
DVB-S2 signal and output
it on a standard CATV fre-
quency.
Normally you‘d want to be
able receive perfect signals.
When it comes to testing a
receiver and its error cor-
rection, it can be extremely
critical to have the ability to
influence the signal quality.
The included StreamX-
press software makes it
possible to inject errors in
the modulated signal. Lost
packets, bit errors and byte
errors can be generated in-
dependent from each other.
The errors are created sta-
tistically, that is, one er-
ror in x packets where x is
specified by the user.
In the case of Bit and Byte,
errors can be given a maxi-
mum value of error bits or
bytes per packet so that the
error correction algorithm
can be tested to its limit.
Naturally, the signal level
at the 50-ohm output is ad-
justable between -63 dBm
and -3 dBm in 0.5 dBm
steps. Additionally, the sig-
nal-to-noise ratio function
can be turned on. It can be
set between 0.0 dB and 30.0
dB.
In the 05-06/2014 issue
of TELE-audiovision we re-
ported on the DekTec API
and showed how easy it is
to develop your own uses
for DekTec hardware in or-
der to create individual test
systems.
If, for example, receivers
need to undergo a quality
test at the end of the manu-