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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
search is completed all
detected transponders find
their way into a new list and the
meter automatically launches
a protocol that measures all
transponders one after the
other. This measurement
protocol can of course be
saved and exported as a CSV
file which can then be edited
using MS Excel, for example.
No special PC software is
required, since the CSV file is
saved onto the USB storage
medium as is.
48. Measurements can be
presented as a bar diagram
as well. The different colours
indicate the signal level within
pre-defined limit values: As far
as DVB-C measurements are
concerned, the bar turns red
whenever the signal level falls
below 57 dBμV, it turns orange
when it exceeds the upper limit
of 74 dBμV, and it stays green
when it is between those two
limit values. While the limits
cannot be changed by users
we have to say that Spaun has
chosen ideal limit values to
begin with, so there is really no
need to interfere. If you look
at the screenshot closely you
will see that we have performed
a TILT measurement. If you
need to do that, you simply
move the markers on the
touchscreen with your
finger. The two markers are
connected with a straight line
and the difference in signal
strength is indicated by the
meter. TILT measurements
are particularly useful for
the correct adjustment of
amplifiers, so that constant
signal amplification across the
entire frequency spectrum can
be achieved.
49. Here we have initiated a
second TILT measurement.
50. The automatic measurement
protocol can be set up in a
way that it either launches a
single search run or several
runs in a loop. In both cases
the meter always saves each
single measurement result,
and if loop mode is selected
users can freely select an
interval between measurement
runs. This way it is possible
to detect and document
intermitting problem that are
not clearly visible all of the
time. Here too, Spaun has
looked at every detail and has
designed the Sparos 711 to add
a timestamp to each individual
measurement.
51. Here’s another outstanding
feature of the Spaun Sparos
711: You can create mixed
lists that include different
modulations. If that is the case
the automatic measurement
protocol will evaluate all pre-
defined transponders. This
is extremely useful if – for
example – a cable network
carries DVB-C transponders in
the UHF/VHF frequency range
and DVB-S/S2 transponders in
the 950 to 2150 MHz range. If
you know right from the start
that satellite transponders
are available on a different
cable, then you can define at
the outset of the measurement
protocol which modulations
on the list should be measured
and which shouldn’t. This way
it is possible to first measure
all DVB-C transponders, then
switch cables and look at the
DVB-S/S2 transponders.
52. The real-time spectrum
for the terrestrial and cable
frequency range reacts
incredibly fast and shows a
tremendous amount of detail.
Seen here is the full span from
5 to 900 MHz.
53. If you reduce the span to
500 MHz you’ll be able to gather
even more details. You’ll also
see analog transponders,
which can easily be detected
due to their separate video and
audio peaks.
54. The main measurement
screen for DVB-C transponders
looks the same as for all other
modulation. Here, too, all
important measurements are
shown alongside a section of
the real-time spectrum, live
video and channel information
– all at the same time.
55. Impressive: The 256QAM
constellation diagram created
with the Spaun Sparos 711.
This is when you truly learn to
appreciate the high resolution
of the 10-inch touchscreen
display. You don’t even have
to zoom in to collect all the
information you need. It just
doesn’t get any better than this.
56. The Spaun Sparos 711 is
not capable of demodulating
analog channels. But then
again, this is not required any
longer in this day and age. Still,
the meter can measure the
signal level and carrier-to-noise
ratio for analog channels too.
And that’s all you’ll ever need.