Goto Section: 73.625 | 73.635 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 73.626 DTV distributed transmission systems.
(a) A DTV station may be authorized to operate multiple synchronized
transmitters on its assigned channel to provide service consistent with
the requirements of this section. Such operation is called a
distributed transmission system (DTS). Except as expressly provided in
this section, DTV stations operating a DTS facility must comply with
all rules applicable to DTV single-transmitter stations.
(b) For purposes of compliance with this section, a station's
“authorized service area” is defined as the area within its predicted
noise-limited service contour determined using the facilities
authorized for the station in a license or construction permit for
non-DTS, single-transmitter-location operation.
(c) Table of Distances. The following Table of Distances describes (by
channel and zone) a station's maximum service area that can be obtained
in applying for a DTS authorization and the maximum interference area
that can be created by its facilities.
Table 1 to Paragraph (c)
Channel Zone Service
(dBu) Distance from reference point Reference
(dBu) Distance from
(km) Node interfering
2-6 1 28 108 132 28 183 18.8
2-6 2 and 3 28 128 158 28 209 18.8
7-13 1 36 101 121 33 182 23.8
7-13 2 and 3 36 123 149 33 208 23.8
14-36 1, 2, and 3 41 103 142 36 246 26.8
(1) DTV station zones are defined in § 73.609.
(2) DTS reference point. A station's DTS reference point is established
in the FCC Order that created or made final modifications to the
Post-Transition DTV Table of Allotments, § 73.622(i), and the
corresponding facilities for the station's channel assignment as set
forth in that FCC Order.
(d) Determining DTS coverage. The coverage for each DTS transmitter is
determined based on the F(50,90) field strength given in the Table of
Distances (in paragraph (c) of this section), calculated in accordance
with § 73.625(b). The combined coverage of a DTS station is the logical
union of the coverage of all DTS transmitters.
(e) DTS protection from interference. A DTS station must be protected
from interference in accordance with the criteria specified in § 73.616.
To determine compliance with the interference protection requirements
of § 73.616, the population served by a DTS station shall be the
population within the station's combined coverage contour, excluding
the population in areas that are outside both the DTV station's
authorized service area and the Table of Distances area (in paragraph
(c) of this section). Only population that is predicted to receive
service by the method described in § 73.622(e)(2) from at least one
individual DTS transmitter will be considered.
(f) Applications for DTS. An application proposing use of a DTS will
not be accepted for filing unless it meets all of the following
(1) The combined coverage from all of the DTS transmitters covers all
of the applicant's authorized service area;
(2) Each DTS transmitter's coverage is contained within either the DTV
station's Table of Distances area (pursuant to paragraph (c) of this
section) or its authorized service area, except where such extension of
coverage beyond the station's authorized service area meets the
(i) In no event shall the F(50,50) service contour of any DTS
transmitter extend beyond that of its reference facility; and
(ii) In no event shall the F(50,10) node-interfering contour of any DTS
transmitter, aside from one located at the reference point, extend
beyond the F(50,10) reference-interfering contour of its reference
(iii) In no event shall the F(50,10) reference-interfering contour of a
facility at the reference point extend beyond the F(50,10)
reference-interfering contour of its reference facility;
(3) Each DTS transmitter's coverage is contiguous with at least one
other DTS transmitter's coverage;
(4) The coverage from one or more DTS transmitter(s) is shown to
provide principal community coverage as required in § 73.625(a);
(5) The “combined field strength” of all the DTS transmitters in a
network does not cause interference to another station in excess of the
criteria specified in § 73.616, where the combined field strength level
is determined by a “root-sum-square” calculation, in which the combined
field strength level at a given location is equal to the square root of
the sum of the squared field strengths from each transmitter in the DTS
network at that location.
(6) Each DTS transmitter must be located within either the DTV
station's Table of Distances area or its authorized service area.
(g) All transmitters operating under a single DTS license must follow
the same digital broadcast television transmission standard.
[ 73 FR 74063 , Dec. 5, 2008, as amended at 83 FR 5022 , Feb. 2, 2018; 86 FR 21226 , Apr. 22, 2021]
Goto Section: 73.625 | 73.635
Goto Year: 2020 |
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