Rover OMNIA 7000, User Manual

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Fig. 4:
DVB-T-64Q CONSTELLATION:
The table to the right shows all the
received modulation parameters
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WKLVGDWDLVVKRZQRQ529(5PHWHUV
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ECHO & MICROECHO MEASUREMENT in “SFN” TV NETWORKS
฀ ฀ ฀ ฀ ฀ ฀
DVB-T 2.000 carriers (2K DVB-T)
*8$5',17(59$/
PD[WLPHPLFURVHFRQGL
PD[GLVWDQFH.P
DVB-T 8.000 carriers (8K DVB-T)
*8$5',17(59$/
PD[WLPHPLFURVHFRQGL
PD[GLVWDQFH.P
TEMPORAL GUARD INTERVAL WIDTH
DOUHDG\DXWRPDWLFDOO\KLJKOLJKWHGE\WKH*5((1PDVN
Fig. 1:
OPTIMUM RECEPTION:*
no ECHO present either outside or inside
the guard interval mask (green area)
Fig. 2:
GOOD RECEPTION:*
2 ECHOES present,
but within the guard interval mask (green
area) coming from a distance of:
1st echo: 15 Km, the same as a 50 µs delay
2nd echo: 25 Km, the same as a 83 µs delay
Fig. 3:
MARGINAL RECEPTION (or IMPOSSIBLE):*
2 ECHOES present outside the guard interval
mask (green area), coming from a distance of:
1st echo: 40 Km, the same as a 133 µs delay
2nd echo: 45 Km, the same as a 150 µs delay
Fig. 1 Fig. 2 Fig. 3