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TELE-audiovision.com—
03-04/2015 —
TELE-audiovision International —
全球发行量最大的数字电视杂志
Constellation
Diagram
99. The Spaun Sparos 711
is capable of showing all
modulations as constellation
diagrams. Let’s start with
DVB-C: 16QAM.
100. DVB-C: 32QAM.
101. DVB-C: 64QAM.
102. DVB-C: 128QAM.
103. DVB-C: 256QAM.
104. DVB-T2: Shifted 16QAM
(shifted QPSK is also
supported, but we were unable
to create a corresponding
signal with high enough
resolution).
105. DVB-T2: Shifted 64QAM.
106. DVB-T2: Shifted 128QAM.
107. DVB-S: QPSK
108. DVB-S2: 8PSK.
109. DVB-S2: 16APSK.
110. DVB-S2: 32APSK.
test run will be initiated auto-
matically. What this means in
everyday use is that techni-
cians checking a distribution
network in a building that has
its own head-end only need
to set up this test routine at
the first wall outlet and can
then use the same protocol
for all additional wall outlets
in the building. All they need
to manually do is save the
measurement protocol for
each outlet, and the rest is
taken care of by the Spaun
Sparos 711. Once again, the
huge touchscreen display
proves its worth for such
jobs, as it allows you to eas-
ily give each saved protocol
a meaningful filename using
the virtual keyboard. If you’re
used to entering letters or
numbers with the T9 system
or a rotary knob then the
Spaun Sparos 711 will propel
you to a new age of meter
technology and user inter-
face. And Spaun has nothing
left to chance. For example,
we noticed that the meter al-
locates a sequential number
to the file name for each new
measurement so that you can
directly save it without hav-
ing to edit the name again
and again. And that’s another
few seconds of valuable time
that can be saved.
There is, however, a small
fly in the ointment when it
comes to the screen key-
board. No matter which lan-
guage you select, the Spaun
Sparos 711 always presents
the virtual keyboard in the
French AZERTY layout. We
hope that the common QW-
ERTY and QWERTZ variants
will be available as well with
an upcoming firmware up-
date.
Naturally, we went for a
real-world test of the Spaun
Sparos 711 and to that end
we decided to re-align a mo-
torised 1.8 m prime focus an-
tenna. What struck us most
– and was extremely helpful –
was the fast and high-resolu-
tion spectrum analyser of the
Spaun Sparos 711. But hunt-
ing for feeds and exotic tran-
sponders worked just as well,
thanks to the hugely efficient
Autoscan mode that identi-
fies reception parameters of
unknown transponders in re-
cord-breaking time. They say
that work can be boring, but
if you actually use the Spaun
Sparos 711 for work, then
that’s a whole different story!
We then proceeded to
measuring all wall outlets of
a house and later evaluated
the measurement protocols
on the PC. This helped us not
only look at the user concept
of this meter in detail, but
also check the actual signal
quality of distributed DVB-C
transponders at two different
locations in the same town in
order to find out whether the
local cable provider actually
delivers constant signal qual-
ity across its network. To that