Philips 14AA3322/40B Guía de instalación Pagina 107

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Generation of a transport stream for DVB and realisation of a HF-modulated DVB-signal
107 | P a g e
Figure 1.5: Whole Spectrum Detail
Question11
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.
Question 12
Go to the Spectrum Detail tab and copy the image. What do you see? Do you think it is a digital
signal?
We can see a perfect DVB-T flat signal with 8MHz BW.
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