/usr/share/dvb/atsc/us-NTSC-center-frequencies is in dtv-scan-tables 0+git20171226.07b18ec-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# primarily of historical interest, many of these channels are no longer used
#
# see also: us-ATSC-center-frequencies-8VSB
#
# VHF low-band, channels 2 to 6, not used for digital
#
[CHANNEL 2]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 57028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 3]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 63028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 4]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 69028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 5]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 79028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 6]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 85028615
MODULATION = VSB/8
INVERSION = AUTO
#
# VHF high-band, channels 7 to 13. not common but a few digital stations use it
# potentially hard to receive because modern antennas are tuned for UHF
#
[CHANNEL 7]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 177028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 8]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 183028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 9]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 189028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 10]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 195028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 11]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 201028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 12]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 207028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 13]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 213028615
MODULATION = VSB/8
INVERSION = AUTO
#
# UHF, channels 14 to 51, most existing stations, almost all digital
#
[CHANNEL 14]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 473028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 15]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 479028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 16]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 485028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 17]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 491028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 18]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 497028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 19]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 503028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 20]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 509028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 21]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 515028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 22]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 521028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 23]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 527028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 24]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 533028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 25]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 539028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 26]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 545028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 27]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 551028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 28]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 557028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 29]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 563028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 30]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 569028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 31]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 575028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 32]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 581028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 33]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 587028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 34]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 593028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 35]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 599028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 36]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 605028615
MODULATION = VSB/8
INVERSION = AUTO
#channel 37, not used in North America due to interference with radio astronomy bands
[CHANNEL 37]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 611028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 38]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 617028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 39]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 623028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 40]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 629028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 41]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 635028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 42]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 641028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 43]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 647028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 44]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 653028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 45]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 659028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 46]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 665028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 47]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 671028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 48]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 677028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 49]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 683028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 50]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 689028615
MODULATION = VSB/8
INVERSION = AUTO
#
# the following frequencies were formerly part of the UHF band before the digital transition
# but were sold off to cell carriers in 2010 as the 700 MHz band and are no longer used for television
#
#channel 51 was originally included in the digital transition but
# no longer used to clear interference with 700 MHz cell bands
[CHANNEL 51]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 695028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 52]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 701028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 53]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 707028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 54]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 713028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 55]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 719028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 56]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 725028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 57]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 731028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 58]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 737028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 59]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 743028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 60]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 749028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 61]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 755028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 62]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 761028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 63]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 767028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 64]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 773028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 65]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 779028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 66]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 785028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 67]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 791028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 68]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 797028615
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 69]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 803028615
MODULATION = VSB/8
INVERSION = AUTO
# UHF formerly had channels 70 through 83 as well
[CHANNEL 70]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 809000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 71]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 815000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 72]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 821000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 73]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 827000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 74]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 833000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 75]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 839000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 76]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 845000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 77]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 851000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 78]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 857000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 79]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 863000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 80]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 869000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 81]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 875000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 82]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 881000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL 83]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 887000000
MODULATION = VSB/8
INVERSION = AUTO
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