Table of Contents
Advertisement
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. 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. 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, whose maximum consumption is 38 kVA, the voltage stabilizer or UPS device capacity
must be 50 kVA. 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.
Manual Rev. 0.1 - February 2018
2
2-1
Advertisement
Table of Contents
