DG-OHM
UNAOHM Srl Rev. 4.0
19
10.2 OPTIMISATION (phase 2
button)
After verification of the correct satellite dish position by reading the orbital position from the
NIT, we will need to optimise signal quality, to ensure viewing even in critical conditions, by
slightly moving the dish.
Digital satellite screen picture.
LOCKED:
SIGNAL LOCKED ON
UNLOCKED / NO CARR:
SIGNAL NOT LOCKED ON : due to poor quality or absence of
signal, no TV pictures can be seen.
Ch BER:
BER channel measurement (bit error ratio, or rather the number of
bit errors over time).
Pv BER:
Post Viterbi BER measurement (bit errors over time after the
correction of Viterbi).
MER:
Modulation error ratio (errors on modulation)
NM:
Noise Margin (guarantee margin in dB).
CFO:
Central frequency offset (indicates the conversion error of the LNB
local oscillators).
10.3 CLEAR NIT AND TV PICTURES VIEWING (phase 3
button)
Once phase 2 has been completed and, therefore, the best quality and quantity signal has
been obtained, simply press the
button to activate the MPEG4 board, which will
communicate the N.I.T. network information table and will allow for selection of a television
broadcaster to display clear pictures (see paragraph 9.3).
