Polytron SCA 508- 4, Руководство по эксплуатации

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5 Recommendations for optimized operation
It is particularly important to ensure that each frequency available at the out-
put of the multiswitch is occupied only once; otherwise the receivers will in-
terfere with each other. The assignment of the frequencies is done in the set-
ting menu of the receiver. Depending on the type, this can be done manually
or automatically.
Twin tuner needs the assignment of two user band frequencies! The signal
must not be looped through from >Output Tuner 1< to >Input Tuner 2< but
should be splitted by a 2-way splitter e.g. (Polytron-Type: FVS2P) and con-
nected to both tuner inputs directly.
It is recommended that the wall sockets with the shorter length connections
are assigned to the higher frequencies.
The low SCR frequencies should preferably be used.
On some receivers the user band counting begins at „0“. In the case of such
specific devices you have to counting down accordingly.
Example: either „0 up to 3“ or „1 up to 4“.
Use at least double shielded antenna cable with high quality and a screening
capability not less than 90 dB.
Please ensure that the used antenna sockets are compatible with the latest
SCR technology and enable a bidirectional signal transfer.
At least one DC decoupled terminating resistor is needed if the SCA x08-4 is
mounted inside a tree structure with pass-through sockets. As last socket in
such a distribution system a pass-through socket has to be mounted, this
one is completed by means of a terminating resistor. This resistor has to be
DC decoupled (Polytron-Type: AW75DC).
Before commissioning, please check the system for possible short circuits of
the coaxial cables. The mounting ground should be:

even and flame proof

dust-free

protected against humidity

not under direct impact of sunlight

not adjacent to heating sources
The ventilation slots of the associated power supply unit may not be covered.
Pay attention to the input levels of the SAT-polarizations having the equiva-
lent level. All installation and fixing of components should only be executed
when the units are disconnected from the mains supply. Avoid short-circuits!
The instructions for operating the device must be observed.