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Section 2 - Minimum Installation Requirements
(E-Compact ATSC Transmitters)
All the ferrous parts and accessories that make up the atmospheric discharge protection system
must be hot galvanized or plated with a 254-mm coat of copper.
The cable length from the lightning arrester up to the flowing pit cannot have any splices and the
cable path must be such so as to avoid angles smaller than 90º, which could create sparking
points.
2.3.2 Cable Protectors
It is advisable to use coaxial protectors for the cables that interconnect outdoor equipment
(antennas, microwave heads, tower converters) to indoor equipment. Such protectors are fitted
with a gas-filled spark arrester that short-circuits to earth any surge discharged in the coaxial
cable. They must be installed in a shelter next to the equipment and the grounding wire must be
connected to the grounding connector of the equipment rack.
If located in hilltops or areas with many transmission sources, it is recommended to use a
Faraday cage or ring to insulate the transmitter from electromagnetic fields and avoid induction
interferences.
2.4
Air Conditioning
2.4.1 Temperature
For optimum equipment performance and longer life the shelter temperature must be rigorously
controlled by means of air conditioning. Taking into consideration the heat dissipation (BTU/
hour) specified for the equipment and the shelter's internal area, the cooling system must be
designed in such a way that the incoming air volume is higher than the outgoing air volume in
order to avoid negative pressure. The shelter temperature must be determined as a function of
the transmission power, as follows:
• TV TRANSMITTERS UP TO 250W: from 0º to 35ºC
• TV TRANSMITTERS FROM 500 TO 1kW: from 0º to 30ºC
• TV TRANSMITTERS ABOVE 2kW: from 0º to 25ºC
If a Hitachi Kokusai Linear equipment is damaged due to the lack or inefficiency of the air
conditioning system, it shall NOT be covered by the guarantee.
2.4.2 Humidity
The relative air humidity inside the shelter is also a very important factor to improve the equipment
performance and extend its life. Hitachi Kokusai Linear equipment must operate in a dry
environment, which can be ensured by means of a suitable air conditioning system. Depending
on the transmission power, the shelter's relative humidity should be as follows:
• TV TRANSMITTERS UP TO 500W: from 0 to 90%
• TV TRANSMITTERS ABOVE 1kW: from 0 to 80%
Manual Rev. 0.1 – September 2014
2-5
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