Goto Section: 15.209 | 15.212 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 15.211 Tunnel radio systems.
An intentional radiator utilized as part of a tunnel radio system may
operate on any frequency provided it meets all of the following
(a) Operation of a tunnel radio system (intentional radiator and all
connecting wires) shall be contained solely within a tunnel, mine or
other structure that provides attenuation to the radiated signal due to
the presence of naturally surrounding earth and/or water.
(b) Any intentional or unintentional radiator external to the tunnel,
mine or other structure, as described in paragraph (a) of this section,
shall be subject to the other applicable regulations contained within
(c) The total electromagnetic field from a tunnel radio system on any
frequency or frequencies appearing outside of the tunnel, mine or other
structure described in paragraph (a) of this section, shall not exceed
the limits shown in § 15.209 when measured at the specified distance
from the surrounding structure, including openings. Particular
attention shall be paid to the emissions from any opening in the
structure to the outside environment. When measurements are made from
the openings, the distances shown in § 15.209 refer to the distance from
the plane of reference which fits the entire perimeter of each above
(d) The conducted limits in § 15.207 apply to the radiofrequency voltage
on the public utility power lines outside of the tunnel.
Goto Section: 15.209 | 15.212
Goto Year: 2020 |
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