Goto Section: 15.707 | 15.711 | Table of Contents
FCC 15.709
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 15.709 General technical requirements.
(a) Power limits for TVBDs. (1) For fixed TVBDs, the maximum power delivered
to the transmitting antenna shall not exceed one watt per 6 megahertz of
bandwidth on which the device operates. The power delivered to the
transmitting antenna is the maximum conducted output power reduced by the
signal loss experienced in the cable used to connect the transmitter to the
transmit antenna. If transmitting antennas of directional gain greater than
6 dBi are used, the maximum conducted output power shall be reduced by the
amount in dB that the directional gain of the antenna exceeds 6 dBi.
(2) For personal/portable TVBDs, the maximum EIRP shall not exceed 100
milliwatts (20 dBm) per 6 megahertz of bandwidth on which the device
operates with the following exceptions; Mode II personal/portable TVBDs that
do not meet the adjacent channel separation requirements in § 15.712(a) and
Mode I personal/portable TVBDs that operate on available channels (provided
by a Mode II TVBD) that do not meet the adjacent channel separation
requirements of § 15.712(a) are limited to a maximum EIRP of 40 milliwatts
(16 dBm) per 6 megahertz of bandwidth on which the device operates.
(3) TVBDs shall incorporate transmit power control to limit their operating
power to the minimum necessary for successful communication. Applicants for
equipment certification shall include a description of a device's transmit
power control feature mechanism.
(4) Maximum conducted output power is the total transmit power over the
occupied bandwidth delivered to all antennas and antenna elements averaged
across all symbols in the signaling alphabet when the transmitter is
operating at its maximum power control level. Power must be summed across
all antennas and antenna elements. The average must not include any time
intervals during which the transmitter is off or is transmitting at a
reduced power level. If multiple modes of operation are possible (e.g.,
alternative modulation methods), the maximum conducted output power is the
highest total transmit power occurring in any mode.
(5) The power spectral density from the TVBD shall not be greater than the
following values when measured in any 100 kHz band during any time interval
of continuous transmission.
(i) Fixed devices: 12.6 dBm conducted power. If transmitting antennas of
directional gain greater than 6 dBi are used, this conducted power level
shall be reduced by the amount in dB that the directional gain of the
antenna exceeds 6 dBi.
(ii) Personal/portable device operating adjacent to occupied TV channels:
−1.4 dBm EIRP.
(iii) Sensing-only devices: −0.4 dBm EIRP.
(iv) All other personal/portable devices: 2.6 dBm EIRP.
(6) TVBDs shall incorporate adequate security measures to prevent the TVBD
from accessing databases not approved by the FCC and to ensure that
unauthorized parties can not modify the TVBD or configure its control
features to operate inconsistent with the rules and protection criteria set
forth in this subpart.
(b) Antenna requirements. (1) All transmit and receive antenna(s) of
personal/portable devices shall be permanently attached.
(2) The transmit antenna used with fixed devices may not be more than 30
meters above the ground. In addition, fixed devices may not be located at
sites where the antenna height above average terrain is more than 250
meters. The HAAT is to be calculated by the TV bands database that the
device contacts for available channels using computational software
employing the methodology in § 73.684(d) of this chapter.
(3) For personal/portable TVBDs operating under § 15.717, the provisions of
§ 15.204(c)(4) do not apply to an antenna used for transmission and
reception/spectrum sensing.
(4) For personal/portable TVBDs operating under § 15.717 that incorporate a
separate sensing antenna, compliance testing shall be performed using the
lowest gain antenna for each type of antenna to be certified.
(c) Emission limits for TVBDs. (1) In the television channels immediately
adjacent to the channel in which the TVBD is operating, emissions from the
TVBD shall not exceed the following levels.
(i) Fixed devices: −42.8 dBm conducted power.
(ii) Personal/portable device operating adjacent to occupied TV channels:
−56.8 dBm EIRP.
(iii) Sensing-only devices: −55.8 dBm EIRP.
(iv) All other personal/portable devices: −52.8 dBm EIRP.
(2) Emission measurements in the adjacent channels shall be performed using
a minimum resolution bandwidth of 100 kHz with an average detector. A
narrower resolution bandwidth may be employed near the band edge, when
necessary, provided the measured energy is integrated to show the total
power over 100 kHz.
(3) At frequencies beyond the television channels immediately adjacent to
the channel in which the TVBD is operating, the radiated emissions from
TVBDs shall meet the requirements of § 15.209.
(4) Emissions in the band 602-620 MHz must also comply with the following
field strength limits at a distance of one meter.
Frequency
(MHz) Field strength
dBµV/meter/120 kHz
602-607 120-5[F(MHz)-602]
607-608 95
608-614 30
614-615 95
615-620 120-5[620-F(MHz)]
(5) TVBDs connected to the AC power line are required to comply with the
conducted limits set forth in § 15.207.
(d) Compliance with radio frequency exposure requirements. To ensure
compliance with the Commission's radio frequency exposure requirements in
§ § 1.1307(b), 2.1091 and 2.1093 of this chapter, fixed TVBDs shall be
accompanied by instructions on measures to take to ensure that persons
maintain a distance of at least 40 cm from the device, as well as any
necessary hardware that may be needed to implement that protection. These
instructions shall be submitted with the application for certification.
Personal/portable TVBDs that meet the definition of portable devices under
§ 2.1093 of this chapter and that operate with a source-based time-averaged
output of less than 20 mW will not be subject to routine evaluation for
compliance with the radio frequency exposure guidelines, while devices that
operate with a source-based time-average output power greater than 20 mW
will be subject to the routine evaluation requirements.
[ 74 FR 7326 , Feb. 17, 2009, as amended at 75 FR 75836 , Dec. 6, 2010; 77 FR 29245 , May 17, 2012]
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Goto Section: 15.707 | 15.711
Goto Year: 2014 |
2016
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