sparos sat hd - Spaun
sparos sat hd - Spaun
sparos sat hd - Spaun
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– SPAROS SAT HD Series –<br />
18.11 Equivalence between V, dBµV, dBmV and dBm<br />
dBµV (dBmV) is the logarithmic ratio between a measured voltage U d<br />
and a reference voltage U r<br />
.<br />
The reference voltage is U r = 1µV (1mV)<br />
N = 20 log (U d<br />
/U r<br />
)<br />
dBm is the logarithmic ratio between a measured power P d<br />
and a reference power P r<br />
.<br />
The reference power is P r = 1mW @ 75Ω<br />
N = 10 log (P d<br />
/ P r<br />
) with P d = Ud 2 / 75<br />
U d<br />
= 1µV N = 0dBµV N = -60dBmV N = -108.75dBm<br />
U d<br />
= 1mV N = 60dBµV N = 0dBmV N = -48.75dBm<br />
U d<br />
= 1V N = 120dBµV N = 60dBmV N = 11.25dBm<br />
18.12 Values to measure<br />
Minimum and maximum values for a good quality of signal.<br />
Measurements<br />
Terrestrial<br />
Level, power (dBµV)<br />
mini<br />
maxi<br />
C/N<br />
(dB)<br />
BER<br />
MER<br />
(dB)<br />
modulation<br />
Analogical TV 57 74 > 45 - - -<br />
FM 50 66 > 38 - - -<br />
DVB-T 35 70 > 26 BERo < 2 E -4 > 26 8K, 64QAM, 1/32, 2/3<br />
DVB-C, MCNS 57 74 > 31 BERo < 2 E -4 > 31 64QAM<br />
Satellite<br />
Analogical TV 47 77 > 15 - - -<br />
DVB-S, DSS 47 77 > 11 BERo < 2 E -4 > 11 QPSK, 3/4<br />
DVB-S2 47 77 > 8 PER < 1 E -7 > 8 8PSK, 2/3<br />
p. 91
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