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03-04/2015 —

TELE-audiovision International —


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


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.