Goto Section: 15.707 | 15.711 | Table of Contents
Revised as of October 1, 2009
Goto Year:2008 |
§ 15.709 General technical requirements.
(a) Power limits for TVBDs are as follows: (1) For fixed TVBDs, the
maximum conducted output power over the TV channel of operation shall
not exceed one watt. Transmitter power will be measured at the antenna
input to account for any cable losses between the transmitter and the
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
(2) For personal/portable TVBDs, the maximum conducted output power
over the TV channel of operation shall not exceed 100 milliwatts;
except that for personal/portable TVBDs that do not meet the adjacent
channel separation requirements in § 15.712(a), the maximum conducted
output power shall not exceed 40 milliwatts. If transmitting antennas
of directional gain greater than 0 dBi are used, the maximum conducted
output power shall be reduced by the amount in dB that the directional
gain of the antenna exceeds 0 dBi.
(3) TVBDs shall incorporate transmit power control to limit their
operating power to the minimum necessary for successful communication.
Applicants for certification shall include a description of a device's
transmit power control feature mechanism.
(4) Maximum conducted output power is the total transmit power in the
entire emission 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.
(b) Antenna requirements . (1) For personal/portable TVBDs, the antenna
shall be permanently attached.
(2) The receive antenna used with fixed devices shall be located
outdoors at least 10 meters above the ground. The antenna system shall
be capable of receiving signals of protected services equally in all
directions. The transmit antenna used with fixed devices may not be
more than 30 meters above the ground.
(3) For both fixed and personal/portable TVBDs, the provisions of
§ 15.204(c)(4) do not apply to an antenna used for transmission and
(4) For both fixed and personal/portable TVBDs with a separate sensing
antenna, compliance testing shall be performed using the lowest gain
antenna for each type of antenna to be certified.
(c) Undesirable emission limits for TVBDs are as follows:
(1) In the 6 MHz channels adjacent to the operating channel, emissions
from TVBD devices shall be at least 55 dB below the highest average
power in the band in which the device is operating.
(2) The above emission measurements 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 6 MHz from the edge of the operating channel,
radiated emissions from TVBD devices shall meet the requirements of
(4) Emissions in the band 602–620 MHz must also comply with the
following field strength limits at a distance of one meter.
(MHz) Field strength
(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.
Goto Section: 15.707 | 15.711
Goto Year: 2008 |
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