User's Manual

KAIROS User Manual - version 1.3
Radio Activity S.r.l. 12/11/2014 26 / 41
The option boards are automatically detected and recognized at the equipment power on.
4 Installation and maintenance
4.1 Improper use
It is recommended to install the equipments in closed cabinet, to allow only authorized people to access to
them, in order to avoid handling or improper use of equipments and to avoid accidental contact with hot
surfaces.
4.2 Thermal dissipation
The repeater may be installed in any location suitable for electronic communications equipment, provided
that the environmental conditions do not exceed the equipment specifications for temperature and
humidity. Humidity conditions should not exceed 95% relative humidity at 50 °C (122 °F).
The temperature, measured in close proximity to the equipment, should not exceed -30 °C (-22 °F) to +60
°C (+140 °F). Therefore, if the equipment is mounted in a cabinet, the temperature within the cabinet
should be maintained within this range.
When planning the installation, observe the following ventilation guidelines:
∞ Outlet cabinet containing the equipments should be designed to ensure a good internal air flux for
heating dissipation. A free slot of at least 1TU is recommended between two adjacent equipments.
∞ If several equipments are installed in a single cabinet, ensure adequate cooling/ventilation to each
equipment. The cabinets should be equipped with ventilation slots or openings in the front (for air
entry) and back or side panels (for air to exit). The cabinet must have a least 15 cm (6 inches) of
open space between the air vents and any wall or other objects.
∞ In case RF transmitter is set for its maximum power, it is active with a duty-cycle near to 100% and
ambient temperature could be above 40°C, a larger respect area must be considered around the
rack and an air forced cooling system should be eventually designed (“FAN” contact of the
equipment can be used to switch on and off an external cooling system). The transmitter is
protected against over-temperature: if the RF mosfet temperature arises over 85°C, the
microprocessor will automatically decrease the generated RF power in order to make the amplifier
work in safety conditions. The nominal RF power will be restored as soon as the mosfet
temperature will decrease below 60°C.
4.3 Power supply system
Internal power supply voltage is nominally set to 13.2V dc from battery, with negative pole connected to
ground, and it is protected against polarity inversion, over-voltage, under-voltage, short-circuits.