User Manual

1.4 Operational Environment
The SSR has been designed to operate properly in a temperature and humidity
controlled indoor environment. Operation in environments where the ambient
temperature is outside the 30
o
-105
o
F range or the relative humidity is greater than
50% may result in unsatisfactory performance. Exposure to temperatures outside the
10
o
-120
o
F range or relative humidity greater than 90% may result in permanent
damage to the unit.
2.0 Installation Guide Lines
2.1 Location
Proper operation of the SSR cannot be achieved if the following installation location
guide lines are not followed.
The prevention of signal feedback from the transmit antenna on one side of the SSR
to the same path’s receive antenna on the opposite side of the SSR is paramount to
proper operation of the SSR. Any matter in the surrounding environment of the SSR
will produce undesirable feedback signals. Any object with any physical dimension
that is greater than 2 inches may cause undesirable signal reflections and/or
refractions severe enough to cause unstable operation of the SSR. Metal objects
normally cause worse reflections and/or refraction than non-metallic objects. The
level of undesired reflected and/or refracted signals is directly proportional to the size
of the object and inversely proportional to the distance between the SSR and the
reflecting/refracting object. Obviously, a perfect “free space” environment for the
SSR is the ideal location, but not practical. However, a major goal of the operating
location selection process is to find a place that approximates a “free space”
environment as closely as possible.
A location that provides a “clear” communication link with a suitable base station
when using a typical handset is also required for proper operation of the SSR. Base
station signal level at various candidate locations should be measured using the RSSI
on a handset or more precise instrumentation. Experience indicates that a location
with the highest base station signal level that is free of any object within a hemisphere
of 15-20 foot radius centered on one side of the SSR should provide suitable SSR
operation.
Figures 3 thru 5 show typical installation locations that have been found to provide a
stable operating environment for the SSR.
Figure 3 is the preferred installation location: on or very near an exterior window.
Extensive testing has show that when mounted directly on the surface of the window
glass of an exterior window well above the floor (8’ minimum) the SSR operates in a
stable fashion for both gain settings if the area outside the window is free of signal
reflecting objects within a 40 foot radius. If mounted near but not on the surface of