Goto Section: 90.185 | 90.201 | Table of Contents
FCC 90.187
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 90.187 Trunking in the bands between 150 and 512 MHz.
(a) Applicants for centralized and decentralized trunked systems operating
on frequencies between 150 and 512 MHz (except 220-222 MHz) must indicate on
their applications (radio service and class of station code, instructions
for FCC Form 601) that their system will be trunked. Licensees of stations
that are not trunked may trunk their systems only after modifying their
license (see § 1.927 of this chapter).
(b) Except as provided in paragraphs (c) and (d) of this section, trunked
systems operating under this section must employ equipment that prevents
transmission on a trunked frequency if a signal from another system is
present on that frequency. The level of monitoring must be sufficient to
avoid harmful interference to other systems.
(c) The monitoring requirement in paragraph (b) of this section does not
apply to trunked systems operating in the 470-512 MHz band that meet the
loading requirements of § 90.313 and have exclusive use of their frequencies
in their service area.
(d) The monitoring requirement in paragraph (b) of this section does not
apply if the application is accompanied by written consent from all affected
licensees.
(1) Affected licensees for the purposes of this section are licensees (and
previously filed pending applicants) meeting both a spectral and a contour
overlap as defined:
(i) Spectral overlap. Licensees (and filers of previously filed pending
applications) with an assigned (or proposed) frequency having a spectral
separation from a frequency of the proposed centralized trunked station that
does not exceed these values:
Proposed station Incumbent authorized bandwidth
25 kHz 12.5 kHz 6.25 kHz
25 kHz 15.0 kHz 15.0 kHz 15.0 kHz
12.5 kHz 15.0 kHz 7.5 kHz 7.5 kHz
6.25 kHz 15.0 kHz 7.5 kHz 5.0 kHz
The left column is the authorized bandwidth requested for the proposed
trunked station. The second row is the authorized bandwidth of the
incumbent. The other cells in the table show the frequency range above and
below the frequency of the proposed centralized trunked station that must be
considered.
(ii) Contour overlap. (A) Licensees (and filers of previously filed pending
applications) with a service contour (37 dBu for stations in the 150-174 MHz
band, and 39 dBu for stations in the 421-512 MHz band) that is overlapped by
the proposed centralized trunked station's interference contour (19 dBu for
stations in the 150-174 MHz band, and 21 dBu for stations in the 421-512 MHz
band). Contour calculations are required for base station facilities.
Contour calculations are required for associated mobile stations only in the
150-174 MHz band, with the associated base station's service contour used as
both the mobile station's service contour and its interference contour.
(B) The calculation of service and interference contours shall be performed
using generally accepted engineering practices and standards, including
appropriate derating factors, agreed to by a consensus of all certified
frequency coordinators. Frequency coordinators shall make this information
available to the Commission upon request.
(C) For purposes of this section, the authorized operating area of a station
or proposed station with no associated base station shall be used as both
the station's service contour and its interference contour.
(D) After January 1, 2013, licensees with an authorized bandwidth exceeding
12.5 kHz will not be deemed affected licensees, unless the licensee meets
the efficiency standard set forth in § 90.203(j)(3) or the licensee was
granted a waiver of § 90.209(b).
(2) The written consent from an affected licensee shall state all terms
agreed to by the parties and shall be signed by the parties. The written
consent shall be maintained by the operator of the centralized trunked
station and be made available to the Commission upon request. An application
for a centralized trunked station shall include either a certification from
the applicant that written consent has been obtained from all affected
licensees, or a certification from the frequency coordinator that there are
no affected licensees.
(3) In addition, the service contour for proposed centralized trunked
stations on Industrial/Business Pool frequencies shall not be overlapped by
an incumbent licensee's interference contour. An application filed for
Public Safety Pool frequencies, see § 90.20, for a proposed centralized
trunked station in which the service contour of the proposed station is
overlapped by the interference contour of the incumbent station(s) is
allowed, but the applicant must accept any resultant interference.
(e) The exclusive service area of a station that has been authorized for
centralized trunked operation will be protected from proposed centralized
trunked, decentralized trunked or conventional operations in accordance with
the standards of paragraph (d) of this section.
(f) Trunking of systems licensed on paging-only channels or licensed in the
Radiolocation Service (subpart F) is not permitted.
(g) Channel limits. (1) No more than 10 channels for new centralized trunked
operation in the Industrial/Business Pool may be applied for at a single
transmitter location or at locations with overlapping service contours as
specified in paragraph (d) of this section. Subsequent applications for
centralized trunked operation are limited to no more than an additional 10
channels, and must be accompanied by a certification, submitted to the
certified frequency coordinator coordinating the application, that all of
the applicant's existing channels authorized for centralized trunked
operation at that location or at locations with overlapping service contours
have been constructed and placed in operation. Certified frequency
coordinators are authorized to require documentation in support of the
applicant's certification that existing channels have been constructed and
placed in operation.
(2) Applicants for Public Safety Pool channels may request more than 10
centralized trunked channels at a single location or at locations with
overlapping service contours if accompanied by a showing of sufficient need.
The requirement for such a showing may be satisfied by submission of loading
studies demonstrating that requested channels in excess of 10 will be loaded
with 50 mobiles per channel within a five year period commencing with the
grant of the application.
(h) If a licensee authorized for centralized trunked operation discontinues
trunked operation for a period of 30 consecutive days, the licensee, within
7 days thereafter, shall file a conforming application for modification of
license with the Commission.
[ 78 FR 28754 , May 16, 2013, as amended at 80 FR 18146 , Apr. 3, 2015]
return arrow Back to Top
Subpart I—General Technical Standards
return arrow Back to Top
Goto Section: 90.185 | 90.201
Goto Year: 2014 |
2016
CiteFind - See documents on FCC website that
cite this rule
Want to support this service?
Thanks!
Report errors in
this rule. Since these rules are converted to HTML by machine, it's possible errors have been made. Please
help us improve these rules by clicking the Report FCC Rule Errors link to report an error.
hallikainen.com
Helping make public information public