FCC 74.861 Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 74.861 Technical requirements.
(a) Transmitter power is the power at the transmitter output terminals and
delivered to the antenna, antenna transmission line, or any other
impedance-matched, radio frequency load. For the purpose of this subpart,
the transmitter power is the carrier power.
(b) Each authorization for a new low power auxiliary station shall require
the use of certificated equipment. Such equipment shall be operated in
accordance with the emission specifications included in the certification
grant and as prescribed in paragraphs (c) through (e) of this section.
(c) Low power auxiliary transmitters not required to operate on specific
carrier frequencies shall operate sufficiently within the authorized
frequency band edges to insure the emission bandwidth falls entirely within
the authorized band.
(d) For low power auxiliary stations operating in the bands other than those
allocated for TV broadcasting, the following technical requirements are
imposed.
(1) The maximum transmitter power which will be authorized is 1 watt.
Licensees may accept the manufacturer's power rating; however, it is the
licensee's responsibility to observe specified power limits.
(2) If a low power auxiliary station employs amplitude modulation,
modulation shall not exceed 100 percent on positive or negative peaks.
(3) The occupied bandwidth shall not be greater than that necessary for
satisfactory transmission and, in any event, an emission appearing on any
discrete frequency outside the authorized band shall be attenuated, at
least, 43+10 log ^10 (mean output power, in watts) dB below the mean output
power of the transmitting unit.
(e) For low power auxiliary stations operating in the bands allocated for TV
broadcasting, the following technical requirements apply:
(1) The power of the measured unmodulated carrier power at the output of the
transmitter power amplifier (antenna input power) may not exceed the
following:
(i) 54–72, 76–88, and 174–216 MHz bands—50 mW
(ii) 470–608 and 614–806 MHz bands—250 mW
(2) Transmitters may be either crystal controlled or frequency synthesized.
(3) Any form of modulation may be used. A maximum deviation of ±75 kHz is
permitted when frequency modulation is employed.
(4) The frequency tolerance of the transmitter shall be 0.005 percent.
(5) The operating bandwidth shall not exceed 200 kHz.
(6) The mean power of emissions shall be attenuated below the mean output
power of the transmitter in accordance with the following schedule:
(i) On any frequency removed from the operating frequency by more than 50
percent up to and including 100 percent of the authorized bandwidth: at
least 25 dB;
(ii) On any frequency removed from the operating frequency by more than 100
percent up to and including 250 percent of the authorized bandwidth: at
least 35 dB;
(iii) On any frequency removed from the operating frequency by more than 250
percent of the authorized bandwidth: at least 43+10log[10] (mean output
power in watts) dB.
(f) Unusual transmitting antennas or antenna elevations shall not be used to
deliberately extend the range of low power auxiliary stations beyond the
limited areas defined in Sec. 74.831.
(g) Low power auxiliary stations shall be operated so that no harmful
interference is caused to any other class of station operating in accordance
with Commission's rules and regulations and with the Table of Frequency
Allocations in part 2 thereof.
(h) In the event a station's emissions outside its authorized frequency band
causes harmful interference, the Commission may, at its discretion, require
the licensee to take such further steps as may be necessary to eliminate the
interference.
(Sec. 5, 48 Stat. 1068; 47 U.S.C. 155)
[ 43 FR 13576 , Mar. 31, 1978, as amended at 52 FR 2535 , Jan. 23, 1987; 63 FR 36605 , July 7, 1998]
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