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use the passive equalizer ERZ 60 to adjust the level (use one ERZ 60 for each satellite
polarisation). If a long coaxial cable is used between the LNB and the OSC 100, you can
adjust the level and the gain slope (for each satellite polarisation) with the VWS 2500. If
several transmitters (OSC 100) are cascaded, a VWS 2500 satellite distribution ampli
fi
er
must be connected between the third and the fourth OSC 100 and also between the
fi
fth
and sixth in the cascade. The maximum quantity is seven in the OSC 100 cascade.
All unused F-type connectors must be terminated with EMK 03, with exception of the 4
SAT-inputs of the OSC 100, which due to DC voltage must be terminated with EMK 05.
All unused optical connectors of the optical network must also be terminated with the
OTC 1.
Note:
Please note that 1 dB of attenuation in the optical transmission path corresponds to
2 dB less signal level in the electrical path (RF).
The output level of the optical receiver OEC 40 and OEC 44 is dependent on the number of
signals transmitted through the optical
fi
bre and the optical attenuation of the section.
The following are reference values for the signals at the receiver:
TV (DTT/CATV)
→
DVB-T, Cable TV
The total output power of the OEC 40 is -27 dBm (82 dB
μ
V) and -32 dBm (77 dB
μ
V) for the
OEC 44 with 21 dB of optical attenuation. That means, that the fewer the digital television
channels transmitted, the higher the output level (per digital channel) and the quality.
Output level optical receiver OEC 40/OEC 44
To ensure reception using the OEC 40 or OEC 44 receiver, the optimal level must lie bet-
ween -14 dBm and -8 dBm. Therefore the attenuation of the distribution system should lie
between 15-21 dB.
Input level of the optical receivers OEC 40/OEC 44
