TechniSat 11/20K - Manual (Page 7)

6 Installation Hints
> We recommend a star-form distribution originating in the attic, or near the centre of
the house/building.
> Please ensure that the levels of the various satellite signals fed into the system are
approximately equal in strength.
> The outputs for participants 5…10 and 16…20 supply a higher output level in the
satellite band. You should use these outputs to connect participants with longer cable
connections.
> Checking all cable connections before connectors are fitted (to identify short circuits)
saves a lot of time possibly searching for faults once everything has been installed.
> Ensure that connections coming from the LNB are not mixed up.
> If you are installing a fairly large set-up, draw up an input level diagram before you
start.
> Make your calculations based on the amplification values given in the technical speci-
fications as well as the appropriate cable damping factors as set out above.
> Try to use single uninterrupted lengths of coaxial cable to make your connections. F-
connector plugs may cause interference of DVB signals.
> Ensure the covers of the F-connectors are secured moderately tight. You should use
the adjustable spanner Art. No. 0000/3407.
> Do not use snap-tight F-connector covers!
> Some older models of LNB require an operating current of 12 V. In this case, be sure
to switch on the voltage limiter provided by the LNB manufacturer between the LNB
and the input of the multiswitch.
Distribution of terrestrial programmes:
> Ensure that output levels are approximately equal (recommended 75 dBµV/Maximal
90dBµV)
> When receiving several terrestrial channels from the same direction, you can utilise
one or more interference filters, eg. TSF 2169/2, Part. No. 000/6042 in order to adjust
signal levels. You will have to know the band allocation, and use an antenna (signal
strength) measuring instrument in order to set the levels of the interference filters in
such a way that weaker signals are not lost against the background noise.
> If additional diagonal compensation is required, TechniSat manufactures a BK com-
pensator, Part No. 0000/3166.
> It may be beneficial to insert a damping unit each at the FM input if FM or cable sig-
nals are being fed into the system.
> Signal strengths of < 55 dBµV are not suitable for distribution systems.
> Where input signals are weak, a low-noise pre-amplifier with high damping should be
employed.
> If a 11/20K unit is cascaded directly with a 11/20G basic unit it may be necessary,
depending on input levels, to insert a damping controller in the terrestrial signal path
between the two units.
> If it is your intention to supply a number of participants with only terrestrial signals,
you should distribute only the combined terrestrial input signal. If necessary, a pre-
amplifier can be included in the circuit before the signal reaches the multiswitch.
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