FCC 74.793 Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 74.793 Digital low power TV and TV translator station protection of
broadcast stations.
(a) An application to construct a new digital low power TV or TV translator
station or change the facilities of an existing station will not be accepted
if it fails to meet the interference protection requirements in this
section.
(b) Except as provided in this section, interference prediction analysis is
based on the interference thresholds (D/U signal strength ratios) and other
criteria and methods specified in Sec. 73.623(c)(2) through (c)(4) of this
chapter. Predictions of interference to co-channel DTV broadcast, digital
Class A TV, digital LPTV and digital TV translator stations will be based on
the interference thresholds specified therein for “DTV-into-DTV.”
Predictions of interference to co-channel TV broadcast, Class A TV, LPTV and
TV translator stations will be based on the interference threshold specified
for “DTV-into-analog TV.” Predictions of interference to TV broadcast, Class
A TV, LPTV and TV translator stations with the following channel
relationships to a digital channel will be based on the threshold values
specified for “Other Adjacent Channels (Channels 14–69 only),” where N is
the analog channel: N–2, N+2, N–3, N+3, N–4, N+4, N–7 , N+7, N–8, N+8, N+14,
and N+15.
(c) The following D/U signal strength ratios (dB) shall apply to the
protection of stations on the first adjacent channel. The D/U ratios for
“Digital TV-into-analog TV” shall apply to the protection of TV broadcast,
Class A TV, LPTV and TV translator stations. The D/U ratios for “Digital
TV-into-digital TV” shall apply to the protection of DTV, digital Class A
TV, digital LPTV and digital TV translator stations. The D/U ratios
correspond to the digital LPTV or TV translator station's specified
out-of-channel emission mask.
------------------------------------------------------------------------
Simple Stringent
mask mask
------------------------------------------------------------------------
Digital TV-into-analog TV..................... 10 0
Digital TV-into-digital TV.................... -7 -12
------------------------------------------------------------------------
(d) For analysis of predicted interference from digital low power TV and TV
translator stations, the relative field strength values of the assumed
antenna vertical radiation pattern in Table 8 in OET Bulletin 69 shall be
doubled up to a value of 1.0.
(e) Protection to the authorized facilities of DTV broadcast stations shall
be based on not causing predicted interference to the population within the
service area defined and described in Sec. 73.622(e) of this chapter, except
that a digital low power TV or TV translator station must not cause a loss
of service to 0.5 percent or more of the population predicted to receive
service from the authorized DTV facilities.
(f) Protection to the authorized facilities of TV broadcast stations shall
be based on not causing predicted interference to the population within the
Grade B field strength contours defined and described in Sec. 73.683 of this
chapter, except that a digital low power TV or TV translator station must
not cause a loss of service to 0.5 percent or more of the population
predicted to receive service from the authorized TV broadcast facilities.
(g) Protection to the authorized facilities of Class A and digital Class A
TV stations shall be based on not causing predicted interference to the
population within the service area defined and described in Sec. 73.6010 (a)
through (d) of this chapter, respectively, except that a digital low power
TV or TV translator station must not cause a loss of service to 0.5 percent
or more of the population predicted to receive service from the authorized
Class A TV or digital Class A TV facilities.
(h) Protection to the authorized facilities of low power TV and TV
translator stations and digital low power TV and TV translator stations
shall be based on not causing predicted interference to the population
within the service area defined and described in Sec. Sec. 74.707(a) and 74.792,
respectively, except that a digital low power TV or TV translator station
must not cause a loss of service to 2.0 percent or more of the population
predicted to receive service from the authorized low power TV, TV
translator, digital low power TV or digital TV translator station.
[ 69 FR 69335 , Nov. 29, 2004]
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