Table of Contents
Advertisement
Modulator parameter setting DVB-T (or DVB-C)
(Right hand section of the screen)
Frequency: by setting the frequency of the fi rst channel, the frequency of the second, third and fourth
channel is automatically computed by adding the channel bandwidth (usually 8MHz).
Please use the proper frequencies according to the frequency plans used in the different regions of the
world. For Europe, please consult the Appendix2 Table and select the centre frequency.
For VHF tuners, you can select channels in the range 170-230MHz, for UHF tuners in the range 470-858MHz
T.S.Id (Transport Stream ID): enter a distinct integer number for each of the transport streams.
Const. (constellation): In DVB-T modulation, you have the choice between three constellations: QPSK,
QAM16 and QAM64, 2 bandwidths, 5 coding rates (FEC), and 4 guard interval choices.
Appendix 3 lists the achievable combined bitrate of the videostream for each of the constellation
combinations.
The higher the QAM number, the more bandwidth you get for the videostream, but the modulated signal is
more sensitive for interference.
Bandwidth, F.E.C. and Guard Int.: select the desired values
Level Att.: The output level of the RF modulated signals goes as high as 95dBµV. You can attenuate this
signal by 20dB by using the slider:
B.W.1, B.W.2, B.W.3, B.W.4 (Bandwidth): indication of the bandwidth use on the TV channels chosen for the
transport streams of the input signals.
DVB-T or DVB-C confi guration
N.I.T. (Network Information Table)
Vers: version number
ONID. (Original Network ID): corresponds to a
country code.
Please consult the Appendix1 table to choose the
proper decimal code for your country (example
8442=France, 8468 = Germany,...)
NID (Network ID): enter the same value as for ONID
LCN (Logical Channel Number): choose between
EACEM, ITC and NORDIG systems. You can enter a
distinct number for each of the sources directly in the
table (bottom section of screen).
This is the number that the TV set will show on screen
and use to organise the sequence of programs (in
this example programs 11, 12, 13, 14).
The four HDMI input streams will be modulated in
pairs (2 Transport Streams) on adjacent TV channels:
up to 3 channels in DVB-T mode, up to 4 channels in
DVB-C mode.
TV channels for transport streams
Logical Channel Number
not relevant
www.abitana.com
9
Advertisement
Table of Contents
