- -
7
The gate is to be mounted on the wall using 2 holes in the
yoke on the back.
A suitable position for the gate should be selected on the basis
of several factors:
•
The distance from the exchange – potential interference
with other lines on the exchange by GSM emitting.
•
Availability of the mains 230V for GSM gate feed.
•
The GSM signal quality in the place of gate installation
(see below).
Necessary GSM signal quality:
The sound quality of connection depends strongly on setting of
BTS to which you are connected with your GSM gate and
phase offsets of the signal on the aerial caused by echoes
from the surrounding environment. This phenomenon is well
known from normal use of mobile telephones and, especially,
from use in cars. We recommend trying other locations for the
aerial (with respect to a very short wave length, even a
replacement by a mere ten centimetres can help according to
experience from practice). When looking for a suitable
position, the signal “quality” is more important than its strength
(analogy with ghost images in case of TV aerials). If you are
not successful, we recommend using a directional aerial for
GSM that eliminates reflections in a considerable extent. The
signal strength for reliable operation is sufficient within the
range of approximately 2 to 3 degrees on the strength indicator
of the GSM telephone field. However, even in this case, the
situation depends on setting of BTS to which you are
connected. We encountered also the places where the
incoming calls were connected without problems with such
signal strength; however, the outgoing signal s were refused by
BTS – BTS probably “selected” the requirements with stronger
signals during more busy operation.
