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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 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 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, 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 amplifier must be connected
between the third and the fourth OSC 100 and also between the fifth and sixth in the
cascade.
The maximum quantity is seven in the OSC 100 cascade. All unused F-type connec-
tors must be terminated with EMK 03, with the 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.
Input level optical receivers OEC 40 mini/OEC 44 mini
To ensure reception using the OEC 40 mini or OEC 44 mini receiver, the optimal level must
lie between -14 dBm and -8 dBm. Therefore the attenuation of the distribution system
should lie between 15-21 dB.
Output level optical receiver OEC 40 mini/OEC 44 mini
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 mini and OEC 44 mini is dependent on the
number of signals transmitted through the optical fibre and the optical attenuation of the
section. The following are reference values for the signals at the receiver:
TV (DTT/CATV)
a
DVB-T, Cable TV
The total output power of the OEC 40 mini is -27 dBm (82 dBμV) and -32 dBm (77 dBμV)
for the OEC 44 mini 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.
