Page 2-2
V10/V7.5/V5/V3.5 Installation and Operation Manual
Issue 3.5
Section 2 Preparation for Use and Installation
Table 2-1:
Cooling Requirements
Transmitter
Mode of
Operation
Rated
Power
(W)
Waste
Heat
(W)
Btu/hr
(x 1000)
Air Conditioning
Required In A Closed
System (Tonnes)
FM
10,000 5,600 19.1
1.59
FM+HD
7,300 7,300 24.9 2.08
V10
HD
2,800 6,500 22.2 1.85
FM
7,500 4,200 14.3
1.19
FM+HD
5,480 5,480 18.7
1.56
V7.5
HD
2,100 4,900 16.7
1.39
FM
5,000 2,800 9.5 0.79
FM+HD
3,650 3,650 12.5 1.04
V5
HD
1,400 3,250 11.1 0.93
FM
3,750 2,100 7.2
0.60
FM+HD
2,740 2,740 9.3
0.78
V3.5
HD
1,050 2,450 8.4
0.70
2.2.1.6 Work Area
Nautel recommends that a suitable work
area with an adequate table surface be
provided near the transmitter to permit
bench adjustment and repair of modules.
Static precautions must be observed.
2.2.1.7 Ac Power Switch
An ac power switching assembly should
be wall mounted in close proximity to the
transmitter.
2.2.2 Lightning Protection
Extremely high voltage and current
transients are produced when a lightning
strike occurs. These transients, which are
usually the most significant hazard to any
solid state transmitter, may be passed to
the transmitter through the wiring
connecting the transmitter to the power
source and the antenna system. All
practical precautions should be taken to
protect the transmitter from this
phenomenon. Refer to the
Lightning
Protection
section of Nautel’s
Recommendations for Transmitter Site
Preparation
booklet for specific protection
techniques. Installing Nautel’s surge
protection panel is highly recommended.
The following requirements are
considered to be essential and failure to
follow the site layout requirements may
void the transmitter warranty.
2.2.3 Station Reference Ground
The site must contain a station reference
ground, as defined in Nautel’s
Recommendations for Transmitter Site
Preparation
booklet. This ground must
provide a continuous, low impedance path
to the earth. The transmitter cabinet's
designated reference ground point, the
shield of the coaxial feed cable, and the
ground connection of the power source's
surge protection devices must be
connected directly to the station reference
ground using, as a minimum, 100 mm
(4 inch) copper strap.
2.2.4 Ac Power Source
All conductors from the ac power source
should be protected by bi-directional
surge protection devices that are
connected between each conductor and
the station reference ground. In addition,
the conductors, as a group, should pass
through a ferrite toroid. The inductance
formed by this toroid is transparent to the
ac voltages, but presents impedance to
transients originating in the power source.
Four toroids (Nautel Part # LP23) are
provided in the ancillary kit. A surge
protector panel, containing suitably rated
varistors, is available from Nautel for this
purpose. If used, the surge protector
panel should be installed in close
proximity to the station reference ground.
NOTE
The following
paragraphs discuss
customer required
connections to the
transmitter. Figure 2-2 is
provided as an aid for
various customer
interface connections
and should be
referenced while
planning and installing
these connections.