Goto Section: 15.257 | 15.301 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 15.258 Operation in the bands 116-123 GHz, 174.8-182 GHz, 185-190 GHz and
(a) Operation on board an aircraft or a satellite is prohibited.
(b) Emission levels within the 116-123 GHz, 174.8-182 GHz, 185-190 GHz
and 244-246 GHz bands shall not exceed the following equivalent
isotropically radiated power (EIRP) limits as measured during the
(1) The average power of any emission shall not exceed 40 dBm and the
peak power of any emission shall not exceed 43 dBm; or
(2) For fixed point-to-point transmitters located outdoors, the average
power of any emission shall not exceed 82 dBm and shall be reduced by 2
dB for every dB that the antenna gain is less than 51 dBi. The peak
power of any emission shall not exceed 85 dBm and shall be reduced by 2
dB for every dB that the antenna gain is less than 51 dBi. The
provisions in this paragraph (b)(2) for reducing transmit power based
on antenna gain shall not require that the power levels be reduced
below the limits specified in paragraph (b)(1) of this section.
(3) The peak power shall be measured with a detection bandwidth that
encompasses the entire occupied bandwidth within the intended band of
operation, e.g., 116-123 GHz, 174.8-182 GHz, 185-190 GHz or 244-246
GHz. The average emission levels shall be measured over the actual time
period during which transmission occurs.
(4) Transmitters with an emission bandwidth of less than 100 MHz must
limit their peak radiated power to the product of the maximum
permissible radiated power (in milliwatts) times their emission
bandwidth divided by 100 MHz. For the purposes of this paragraph
(b)(4), emission bandwidth is defined as the instantaneous frequency
range occupied by a steady state radiated signal with modulation,
outside which the radiated power spectral density never exceeds 6 dB
below the maximum radiated power spectral density in the band, as
measured with a 100 kHz resolution bandwidth spectrum analyzer. The
center frequency must be stationary during the measurement interval,
even if not stationary during normal operation (e.g., for frequency
(c) Spurious emissions shall be limited as follows:
(1) The power density of any emissions outside the band of operation,
e.g., 116-123 GHz, 174.8-182 GHz, 185-190 GHz or 244-246 GHz, shall
consist solely of spurious emissions.
(2) Radiated emissions below 40 GHz shall not exceed the general limits
in § 15.209.
(3) Between 40 GHz and the highest frequency specified in § 15.33, the
level of these emissions shall not exceed 90 pW/cm2 at a distance of 3
(4) The levels of the spurious emissions shall not exceed the level of
the fundamental emission.
(d) Fundamental emissions must be contained within the frequency bands
specified in this section during all conditions of operation. Equipment
is presumed to operate over the temperature range −20 to + 50 degrees
Celsius with an input voltage variation of 85% to 115% of rated input
voltage, unless justification is presented to demonstrate otherwise.
(e) Regardless of the power density levels permitted under this
section, devices operating under the provisions of this section are
subject to the radiofrequency radiation exposure requirements specified
in § § 1.1307(b), 2.1091, and 2.1093 of this chapter, as appropriate.
Applications for equipment authorization of devices operating under
this section must contain a statement confirming compliance with these
requirements for both fundamental emissions and unwanted emissions.
Technical information showing the basis for this statement must be
submitted to the Commission upon request.
(f) Any transmitter that has received the necessary FCC equipment
authorization under the rules of this chapter may be mounted in a group
installation for simultaneous operation with one or more other
transmitter(s) that have received the necessary FCC equipment
authorization, without any additional equipment authorization. However,
no transmitter operating under the provisions of this section may be
equipped with external phase-locking inputs that permit beam-forming
arrays to be realized.
(g) Measurement procedures that have been found to be acceptable to the
Commission in accordance with § 2.947 of this chapter may be used to
[ 84 FR 25691 , June 4, 2019]
Subpart D—Unlicensed Personal Communications Service Devices
Source: 58 FR 59180 , Nov. 8, 1993, unless otherwise noted.
Goto Section: 15.257 | 15.301
Goto Year: 2020 |
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