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Section 2 - Minimum Installation Requirements
(E-Compact ATSC Transmitters)
Section 2
Minimum Installation Requirements
2.1
Introduction
This section describes the minimum requirements for the E-Compact ATSC transmitters installation,
including recommendations about shelter, tower, antennas, cables, grounding, electric network,
transient prevention, etc.
2.2
Minimum Requirements
2.2.1 Electric Power
2.2.1.1 Grounding
The grounding system to which the Hitachi Kokusai Linear TV transmitter will be connected
must be designed and installed by qualified professionals. A deficient grounding system could
represent a danger not only for the equipment, but also for people working in the shelter. Moreover,
the transmitted signal quality can be remarkably impaired by a deficient grounding system, which
usually takes the form of "rames", i.e. vertical bars moving upwards in a television set screen. A
satisfactory grounding system should have maximum 5 resistance between the grounding and
neutral terminals.
An important aspect is that all the devices involved in a transmission system should have the
same potential in order to avoid DDP and enable a balanced flow of eventual atmospheric
discharges.
It must be borne in mind that, if it is necessary to change the chemical characteristics of the soil
in order to lower the impedance, a temporary condition would be created (as it would not be the
natural local chemistry), which will be naturally absorbed over time. In this case, periodic preventive
checking should be made during maintenance activities.
2.2.1.2 Stability
The voltages delivered to each phase of the Hitachi Kokusai Linear TV transmitter must be
purely sinusoidal and stabilized. For this reason, it is necessary to use voltage stabilizers or
stabilized uninterrupted power systems (UPS), since such devices protect the TV transmitter
from power surges. It must be kept in mind that input voltage variations more than 15% above
the transmitter specification can damage the equipment, and such damages are not covered by
the factory guarantee. Moreover, it must be checked the potential difference between the ground
and neutral (if any) terminals to be connected to the Hitachi Kokusai Linear TV transmitter. Such
potential difference must be maximum 3V. The voltage stabilizer or UPS must be dedicated to
the Hitachi Kokusai Linear TV transmitter. The voltage stabilizer or UPS device must be designed
for at least 30% above the consumption (in kVA) specified for the TV transmitter. Therefore, in
the case of the TV transmitter LD710K, whose maximum consumption is 38 kVA, the voltage
stabilizer or UPS device capacity must be 50 kVA.
Manual Rev. 0.0 – April 2016
2
2-1
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