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3.1.2 Stations
Particular attention should be given to the following points during
installation.
* A desk-type, wall-mounting-type or desk/wall-type should be chosen
according to the user's need.
* If the all-call paging or talk-back function is adopted, precautions should
be taken to ensure against feedback due to interference between the
station (microphone) and the paging or talk-back speaker; that is, they
should be installed facing different directions or separated as far as
possible from each other.
* The "para-branching" operation or the connection of more than one
station to one circuit is not possible.
* Adjust the volume switch and volume control on the station for com-
fortable speaker output level or for avoiding troublesome acoustical
conditions (e.g., reverberation or echo).
Stations are compact for easy installation almost anywhere. However, areas
described below should be strictly avoided.
* An area where it will be exposed to fire, heat or direct sunlight.
* A dusty area where it will be exposed to metal dust or dirt.
* Near a storage place for chemicals, oil, etc.
* An area subject to vibration.
* Near high-voltage equipment.
* In a strong electric field.
* On the same circuit as a SCR type light dimmer.
3.1.3 TKU-11
The talk-back unit is to be installed with an optional amplifier (10W max.)
in the place where the talk-back function is desired.
The speaker is to be a Hi-Z trumpet speaker installed on the ceiling or wall.
The optimum installation site for the speaker is approximately 2m from
speaking position. The talk-back unit should be placed by the optional
amplifier. The speaker should be installed as close to the talk-back unit
as possible.
Be sure to use shielded cable or twisted cable for the speaker wires to
prevent interference caused by high-voltage cables, electromagnetic
induction and high-frequency waves.
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