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 MIL-HDBK-1012/1
8.2.3.4
Cable Trays. Provisions shall be made for installation of cable
trays as required by the BESEP.
8.2.3.5
Emergency Power.
An emergency power source shall be provided as
set forth in the BESEP.
a) No-break power. Class D no-break shall be provided as
designated in the BESEP.
b) All communication equipment not connected to no-break power
shall be fed from the technical load bus.
8.2.3.6
Grounding. Red/black grounding in accordance with MIL-HDBK-419 is
normally required in communication centers.
8.2.3.7
Shielding. When required, shielded rooms and attenuation
requirements shall be as set forth in the BESEP.
8.3
Transmitter Buildings. A transmitter station consists of
transmitting antennas and one or more buildings to house electronic equipment.
The transmitter station is provided with communication links using microwave
radio and land lines between the facility, the communication center, the
receiver site, and the control tower, as required. Helix houses associated
with low-frequency systems are discussed in Section 9 of this manual. For
further information, refer to NAVELEX 0101,102. For one type of building
layout, refer to Figure 11.
8.3.1
Architectural and Structural. In addition to the general
requirements of Section 3, ventilated transmitter buildings normally are
cruciform in shape, allowing for two rows of transmitters in the wings. A
truck-loading platform shall be provided at the end of each transmitter wing
to permit access for the largest equipment or equipment subsection. The
control area shall be centrally located between the wings and the
administrative, shop, and maintenance areas in adjacent space. Details will
be set forth in the BESEP.
8.3.2
Mechanical. Transmitters liberate significant quantities of waste
heat making air conditioning impracticable except where very small or very few
transmitters are involved. The waste heat from large transmitter facilities
should be removed either by ventilation or by heat exchange methods. The
features of each are specified in paras. 8.3.2.1 and 8.3.2.2.
8.3.2.1
Ventilation. Requires the system to be arranged so that tempered
ventilating air can enter the intake on the rear of the transmitter and so
that the hot exhaust air at the top of the transmitter can be removed without
the use of ducting that would, or could, exceed the static pressure capability
of the fans within the transmitter and without short circuiting hot air into
the transmitter intake or into the operators space.
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