eng TELE-audiovision 1411
The World’s Largest Digital TV Trade Magazine
The World’s Largest Digital TV Trade Magazine
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11 12<br />
13 14<br />
Blindscan<br />
11. Blindscan Tool for the TBS QBOX 5925<br />
12. The BlindScan tool can recognize transponders with very low<br />
as well as very high symbolrates. Even MIS transponders were<br />
instantly recognized.<br />
13. TS Recorder can store the selected transponder stream in a TS<br />
file on the hard drive of a PC.<br />
14. Results of a BlindScan of HOTBIRD at 13° east. A total of 120<br />
active transponders were found.<br />
standard a satellite channel<br />
is transmitted with a fixed<br />
modulation mode and error<br />
correction code. In other<br />
words, all of the receivers<br />
wherever they may be in<br />
the footprint of the satellite<br />
receive the same signal and<br />
process it identically.<br />
At first glance this technology<br />
appears to be logical and<br />
correct but if you look again<br />
you‘ll recognize the disadvantage:<br />
since they are all<br />
receiving the same signal,<br />
the receivers cannot react<br />
the same way to especially<br />
strong signals in a satellite‘s<br />
primary footprint as they<br />
can with especially weaker<br />
signals in the outer edges<br />
of the same satellite‘s footprint.<br />
With stronger signals<br />
a smaller error correction<br />
is required and a more efficient<br />
modulation would suffice<br />
but with weaker signals<br />
it‘s the other way around: a<br />
46 <strong>TELE</strong>-<strong>audiovision</strong> International — The World‘s Leading Digital TV Industry Publication — 11-12/2014 — www.<strong>TELE</strong>-<strong>audiovision</strong>.com
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