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 type accepted equipment. Such equipment shall be 
operated in accordance with the emission specifications included in the 
type acceptance 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,

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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 log10 (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 
&177;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+10log10 (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. )

[43 155 FR 13576 , Mar. 31, 1978, as amended at  52 FR 2535 , Jan. 23, 1987]