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FM and DAB+
FM and DAB+ signal level should be at least 10 dB lower than the digital TV signals.
SAT
1. Input level:
At OSC 100 micro there must be a level of 69 and 86 dBμV per transponder, so that
the AGC functions properly.
2. Differing levels within a satellite level:
The level difference of a satellite transponder level (VL/VH/HL/HH) should not exceed 4
dB. If the transponders have a gain slope on the inputs of the OSC 100 micro and the
level is high enough, you can, in certain circumstances, 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 micro, you can adjust the level and
the gain slope (for each satellite polarisation) with the VWS 2500. If several transmit-
ters (OSC 100 micro) are cascaded, a VWS 2500 satellite distribution amplifi er must be
connected between the third and the fourth OSC 100 micro and also between the fi fth
and sixth in the cascade.
The maximum quantity is seven in the OSC 100 micro cascade. All unused F-type
connectors must be terminated with EMK 03, with the exception of the 4 SAT-inputs
of the OSC 100 micro, 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.
Input level optical receivers OEC 40 micro/OEC 44 micro
To ensure reception using the OEC 40 micro or OEC 44 micro receiver, the optimal level
must lie between -14 dBm and -8 dBm. Therefore the attenuation of the distribution sys-
tem should lie between 15-21 dB.
Output level optical receiver OEC 40 micro/OEC 44 micro
Please note that 1 dB of attenuation in the optical transmission path corre-
sponds to 2 dB less signal level in the electrical path (RF).
The output level of the optical receiver OEC 40 micro and OEC 44 micro 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 micro is -27 dBm (82 dBμV) and -32 dBm (77 dBμV)
for the OEC 44 micro 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.
