FM TRANSMITTER
TR
EM
1000
HE
DIG
PLUS
COMPACT
Technical Manual 1v2 November 2019
16
• Room size should be such that the device can be placed in an upright position, and that
technical personnel can easily perform routine or extraordinary maintenance. Evaluate the
minimum size according to the power supplied by your model, taking into account that a
volume of 2.5x2.2m in height is required for a transmitter with 1 KW of power, and that no
other transmission or auxiliary devices should be present in the vicinity.
• Place the apparatus as close as possible to the antenna, in order to prevent excessive power
loss in the cables. If this is not feasible, use antenna cables with low loss and suitable cross-
section.
• Vents in the walls and any other openings must be fitted with metal gratings to keep
rodents and insects out, and must be equipped with a dust filter. Make absolutely sure that
no water can seep through the vents, the air exhaust duct, or the antenna cable grommet.
Also confirm that the floor is not at risk of flooding during heavy rainfall.
- Climatic conditions
• In order to achieve optimum performance in terms of power, life span, etc., the ideal room
temperature should range between 5°C and +25°C. As a general rule, the useful life span of
the device may be halved by a 10°C increase in room temperature, should the temperature
exceed 30°C. The pre-set over-temperature alarm will activate when the limit of 45°C is
exceeded. It is advisable to hang a minimum/maximum thermometer on the wall to indicate
variations in temperature.
• The room must be ventilated to ensure that the temperature never exceeds 35°C. Such
conditions can NOT generally be met when the exhaust cooling air is not pushed outside and
is instead fed back into the room. This is also occurring if more than one device is installed in
the same location. An efficient ventilation system with air exchange is thus required in the
room. For your reference, the air flow rate required for proper functioning of a 1KW
transmitter must be at least 500 cubic meters per hour.
Evaluate this element in proportion to the power supplied by the model you are installing.
• If the device is placed on a rack, the rear door of the rack can not usually be secured. If the
system must be completely enclosed, a ventilation and air removal system must be created.
To encourage air flow, a flange can be installed at the ventilation outflow, to which a hot air
discharge conduit can be connected to the exterior. In this case, it is important to remember
that the transmitter’s internal fans are low pressure units and that it is fundamental for an
exhaust fan to be installed on the air discharge conduit.
• The best solution is to keep the room at 20-25°C. Thermal insulation and effective
ventilation via a fan controlled by a thermostat generally present the most advantageous
solution.
• Excessive concentrations of moisture and/or dust in the air or in the room may cause a
condensation build-up in the transmitter. If the system is periodically switched on and off, this
can trigger destructive electric arcs and short circuits, and thus cause damage that is not
covered by warranty.
- Electrical conditions
• The mains capacity must be proportionately designed to adequately support the device’s
power consumption (including a sufficient safety margin).
