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Section 2 - Minimum Installation Requirements
(E-Compact ATSC Transmitters)
2.3
Atmospheric Discharge Protection System
2.3.1 Lightning Arresters
The Atmospheric Discharge Protection System comprises the lightning arresters and their
elements. The tower and the shelter where the equipment is installed must be protected against
atmospheric discharges by means of FRANKLIN-type lightning arresters, which must be designed
and installed by the USER in accordance with the criteria set forth by standard NBR 5419 (in its
latest version) and in such a way that the whole station is covered by the protection zone as
defined by the electrogeometric model of rolling spheres Level I.
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.
Manual Rev. 0.1 - February 2018
DELTA
TRANSFORMER
CA
CC
DELTA CONVERTER
Figure 2-3 - No-Break on-line Delta Conversion
STATIC BYPASS
KEY
CC
MAIN INVERTER
BATTERY
CA
2-4
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