Chapter 3
General safety instructions
3.4 Proper installation, use and maintenance of TEL-MARequipments
◊
TEL-MAR equipments shall be transported and stored according to the prescribed
information, which is given in this Manual.
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The AC supply line voltage shall be in accordance with the rated value and tolerance
stipulated by the manufacturer; generally within ±10% of the nominal value specified by
TEL-MAR , unless stated otherwise.
◊
If normal AC line voltage variations exceed this tolerance, it is essential to employ a
voltage stabiliser, or line conditioner.
◊
If there is likely to be instantaneous line over voltage; for example, transients caused by
electrical machinery connected to the same line, or by nearby electrical discharges,
lightning etc.; it is desirable to install a grounded screen shot isolating transformer to avoid
damage to the Equipment. It is also always recommended to use AC line surge protectors
to minimise lightning damage.
◊
TEL-MAR equipments are designed for indoor use, unless stated otherwise. So they
must be protected from rain, water or bad weather conditions.
Variations of weather
conditions must not be too rapid and must be so slow to avoid forming of
condensate.
◊
For TEL-MAR equipment designed for indoor use, the ambient temperature where
equipment is used shall be within -10°C and +45°C, unless stated otherwise.
Operating the Equipment for long periods at high temperature (i.e. 40-45°C) greatly
reduces the lifetime of some components, so it is important to provide the Transmitter
area with forced air ventilation system. TEL-MAR ’s Technical Office is available to
suggest the most suitable air cooling system in particular cases.
◊
Dust and high humidity cause deterioration and damage to electronic equipment. It pays
therefore to give prepare the area in which the Equipment is to be used by installing air
filters and adequate ventilation. This to avoid an excessive degree of humidity or dust,
which will never exceed the specified limits.
Again, Customers may contact TEL-MAR ’s Technical Office for
suitable advice.
◊
Before switching on a Transmitter or Power Amplifier (even though VSWR protection is
fitted) the output connector shall be connected to a suitable load, antenna or to
successive equipment which has been tested and is ready to work.
◊
Antennas or loads shall have a VSWR better than 1.5:1 (14 dB return loss) unless
otherwise specified.
◊
TEL-MAR ’s equipments never can be used with output power higher than the nominal
one or with driving signals different from those specified in the
technical data
. Input
signal peaks higher that the ones specified can cause permanent damage to the
equipments.
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