Harris Platinum HT EL 2000LS, Technical Manual

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Section II
Installation
2.1
Introduction
This section contains information necessary for installation
planning, installation, and initial checkout procedures on Plati-
num™ Series HT EL2000LS/HS television transmitters. The
information in this section is intended to be used only as a
general guideline in planning the installation. Since all installa-
tions differ in some respects, and in order to conform to local
building and electrical codes, the information contained must be
adapted for each installation.
2.1.1
Test Equipment Requirement Planning
See Table 2-1 for a list of recommended test equipment.
2.2
Mechanical Installation Planning
2.2.1
Space Requirements
(Refer to Transmitter Outline drawing: 843-5285-110)
Planning for the transmitter room should allow space for pro-
gram input, monitoring, remote control, and test equipment as
well as the transmitter. Additional area may also be required for
tower lighting, HVAC (heating, ventilation and air-condition-
ing) equipment, storage, and a workbench. To allow for servic-
ing the transmitter, a minimum clearance of 3 feet (92 cm) in
front of and 20 inches (51 cm.) behind the cabinet is recom-
mended.
The Transmitter Outline drawing, shows the air exhaust hole
pattern locations, do not obstruct these exhaust areas. Leave side
exhaust areas unobstructed for at least 8 inches (20 cm.).
2.2.2
Approximate Shipping Weights
(lb) (kg)
Cabinet 435 198
Exciter 55 25
RF modules each 26 12
Power module 125 57
Be sure to include this information in your planning for the
building and verify that the structure is capable of safely sup-
porting the total weight of the transmitter and peripheral equip-
ment.
2.2.3
RF System Layout
The 1 5/8 EIA unflanged visual RF output and the N connector
aural output are on the top of the cabinet. Adapters are furnished
where needed to connect RF coax cables to 1 5/8 EIA compo-
nents. The outline drawings of typical RF notch diplexers and
harmonic filters are included. Use the block diagrams and
component outline drawings (Fig 2-2 through 2-11) to plan the
installation for the site requirements. Locate the transmitter
close to the diplexer to minimize the interconnection line losses.
A support system should be installed so that the RF components
are completely supported, to minimize the weight carried by the
output connectors. This will prevent possible damage to com-
ponents and connectors. Notch diplexers are generally supplied
in a frame which rests on or is bolted to the floor.
Directional couplers for metering are in the transmitter cabinet.
Optional directional couplers for monitoring are on the block
diagram and should be ordered with the transmitter. Be sure all
components necessary for installation are available on site.
2.2.4
Air System
Minimum transmitter air cooling requirements are 1200 cubic
feet per minute (34 cubic meters per minute). Additional flush-
ing air is recommended for the removal of heat from any
equipment surrounding the transmitter. A good guideline is to
keep input air no greater than 5°C above ambient. The maximum
transmitter operating temperature is 45°C at sea level (derate
2°C for each 1000 feet (300 meters) above sea level. Hot air
rises, one approach would be to use exhaust duct(s) or louvers
at the highest point of the room and use a supply fan and filter
frame to keep the room at a positive pressure.
Appendix B contains information useful to those intending to
use air conditioning equipment to control transmitter building
temperature.
2.3
Electrical Installation Planning
Each country establishes standards for AC power systems. The
national and local applicable standard for the installation should
be followed.
See Appendix C for information about lightning and surge
protection.
2.3.1
Power Requirements
The transmitter is designed to operate from 208 to 240 volts, 50
or 60 Hz, single phase. If voltage variations in excess of +10%
are anticipated, it is recommended that the transmitter AC mains
be equipped with automatic voltage regulators capable of cor-
recting the primary voltage.
All control wiring and signal inputs are located at the I/O panel
in the cabinet. Additional access is provided in the cabinet floor
for AC wiring only. AC power to the transmitter should be run
in metallic conduit, connected to earth ground for safety and to
provide shielding against interference. The power wiring must
be terminated in a power distribution panel, this panel must also
be connected to earth ground. A transmitter cabinet ground strap
connection is located at the lower rear edge.
2.3.2
Circuit Breaker Selection
The transmitter requires a relatively stable source of input
power. For this reason, the primary power for the transmitter
should originate at the main power distribution system and
remain isolated from other electrical distributions.
888-2457-001 2-1
WARNING: Disconnect primary power prior to servicing.