Philips 14AA3322/40B Guia de Instalação descarregar pdf (Página 30)

Generation of a transport stream for DVB and realisation of a HF-modulated DVB-signal

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 At question 28 there was an extra sub-question added to make the students more

familiar with the software.

The original questions and answers were:

Which is the constellation, Guard Interval and Code Rate of the multiplex?

The constellation is 64-QAM, the Guard Interval is ¼ and Code Rate is 1/2.

And they became:

What is the constellation, Guard Interval and Code Rate of the multiplex? Which is the

bandwidth of the channel?

The constellation is 64-QAM, the Guard Interval is ¼ and the Code Rate is 1/2. The bandwidth of

the channel is 8MHz.

9.3.2 DecTek DTU-235 exercise:

 A general remark about the DekTec exercise is that nowadays in the area we can only

receive channel number 22. Every other channel is not available anymore.

 At question 11 because of the non-availability of the channels the answer had to be

changed.

The original question and answer were:

By seeing the system spectrum: how many DVB-T signals are we receiving? Write

(approx.) their frequencies:

We are receiving 4 DVB-T multiplex. Their frequencies are (approx.) 480Mhz, 620Mhz,

660Mhz and 670Mhz.

And they became:

By observing the system spectrum: how many DVB-T signals do we receive? Write

(approximately) their frequencies:

We receive a lot of signals. Because nowadays at the area there is only channel no.22

broadcasting, this is the only DVB-T signal that we receive. Every other signal is noise or

interference. The frequency of channel no.22 is 480MHz and it’s the highest frequency

that we receive in this graph.

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Philips 14AA3322/40B Guia de Instalação Página 30