Federal Communications Commission
Before the
Federal Communications Commission
Washington, D.C. 20554
In the Matter of
Unlicensed Operation in the TV Broadcast Bands
Additional Spectrum for Unlicensed Devices
Below 900 MHz and in the 3 GHz Band
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ET Docket No. 04-186
ET Docket No. 02-380 
ERRATUM
Released:  October 19, 2010
By the Chief, Office of Engineering and Technology:
1. This Erratum corrects certain text and amendments to the Commission’s rules in the Second 
Memorandum Opinion and Order (MO&O) in the above captioning proceedings, FCC 10-174, that was 
adopted and released September 23, 2010.
2. Footnote 65 in paragraph 35 of the text of the MO&O is corrected to read:
Mode I personal/portable devices will use the same set of available channels as the fixed or Mode II 
device with which they communicate and our presumption under the rules is that the specific geographic 
location of these devices will not be known.  Therefore, the distance between a Mode I device and a 
protected (registered) wireless microphone site cannot be identified with any more accuracy than the 
location of the fixed or Mode II device with which the Mode I device communicates.  We will therefore 
treat Mode I devices the same as fixed and Mode II devices for purposes of protecting wireless 
microphones – in this respect the list of channels they obtain from their fixed or Mode II device will 
reflect at least a 1 km or 400 m separation from a protected wireless microphone site.  However, Mode I 
devices will in fact as often as not be located closer to a protected site than their fixed or Mode II device.
3. The last sentence of paragraph 83 of the text of the MO&O is corrected to read: 
We are also clarifying that a device that operates across more than one 6 MHz TV channel is still subject 
to the maximum power limits in Sections 15.709(a)(1) and (a)(2) of the rules per channel – the allowable 
power per channel does not increase with use of additional bandwidth beyond 6 megahertz.169
4. The last sentence of paragraph 87 of the text of the MO&O is corrected to read:
Thus, we are revising the required adjacent channel attenuation to be 72.8 dB.
5. In Appendix A, Sections 15.709(a)(1) and a(2) are corrected to read: 
(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 
  
169 See 47 C.F.R. § 15.709(a)(1) and (a)(2).
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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.
6. In Appendix A, Section 15.709(c)(2) is corrected to read:
(2) Emission measurements in the channel of operation shall be performed over a reference bandwidth of 
6 megahertz with an average detector.  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.
7. In Appendix A, Section 15.712(b) is corrected to read as follows:
(b) TV translator, Low Power TV (including Class A) and Multi-channel Video Programming Distributor 
(MVPD) receive sites.  MVPD, TV translator station and low power TV (including Class A) station 
receive sites located outside the protected contour of the TV station(s) being received may be registered in 
the TV bands database if they are no farther than 80 km outside the nearest edge of the relevant 
contour(s).  Only channels received over the air and used by the MVPD, TV translator station or low 
power/Class A TV station may be registered.  TVBDs may not operate within an arc of +/-30 degrees 
from a line between a registered receive site and the contour of the TV station being received in the 
direction of the station’s transmitter at a distance of up to 80 km from the edge of the protected contour of 
the received TV station for co-channel operation and up to 20 km from the registered receive site for 
adjacent channel operation, except that the protection distance shall not exceed the distance from the 
receive site to the protected contour.  Outside of this +/-30 degree arc, TVBDs may not operate within 8 
km from the receive site for co-channel operation and 2 km from the receive site for adjacent channel 
operation.  For purposes of this section, a TV station being received may include a full power TV station, 
TV translator station or low power TV/Class A TV station.
8. In Appendix A, Section 15.713(b)(2)(i) is corrected to read as follows:
(i) MVPD receive sites.
9. In Appendix A, Section 15.713(c) is corrected to read as follows:
(c) Restrictions on registration.
(1) Television translator, low power TV and Class A TV station receive sites within the protected contour 
or more than 80 kilometers from the nearest edge of the protected contour of the station being received 
are not eligible for registration in the database.
(2) MVPD receive sites within the protected contour or more than 80 kilometers from the nearest edge of 
the protected contour of a television station being received are not eligible to register that station’s 
channel in the database.
10. In Appendix A, Section 15.713(f)(3)(iv) is corrected to read as follows:
(iv) device’s antenna height above ground level (meters)
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11. In Appendix A, Section 15.713(h)(8) is corrected by replacing the existing paragraph (h)(8)  
and adding a new paragraph (h)(9) to read:
(8) Licensed low power auxiliary stations, including wireless microphones and wireless assist video 
devices.  Use of licensed low power auxiliary stations at well defined times and locations may be
registered in the database.  Multiple registrations that specify more than one point in the facility may be 
entered for very large sites.  Registrations will be valid for no more than one year, after which they may 
be renewed.  Registrations must include the following information:
(i) name of the individual or business responsible for the low power auxiliary device(s)
(ii) an address for the contact person
(iii) an email address for the contact person (optional)
(iv) a phone number for the contact person
(v) coordinates where the device(s) are used (latitude and longitude in NAD 83, accurate to +/- 50 m)
(vi) channels used by the low power auxiliary devices operated at the site
(vii) specific months, weeks, days of the week and times when the device(s) are used (on dates when 
microphones are not used the site will not be protected)
(viii) the stations call sign. 
(9) Unlicensed wireless microphones at venues of events and productions/shows that use large numbers of 
wireless microphones that cannot be accommodated in the two reserved channels and other channels that 
are not available for use by TVBDs at that location.  Such sites of large events and productions/shows 
with significant wireless microphone use at well defined times and locations may be registered in the 
database.  Entities responsible for eligible event venues registering their site with a TV bands data base 
are required to first make use of the two reserved channels and other channels that are not available for 
use by TVBDs at that location.  As a benchmark, at least 6 – 8 wireless microphones should be operating 
in each channel used at such venues (both licensed and unlicensed wireless microphones used at the event 
may be counted to comply with this benchmark).  Multiple registrations that specify more than one point 
in the facility may be entered for very large sites.  Sites of eligible event venues using unlicensed wireless 
microphones must be registered with the Commission at least 30 days in advance of the defined time of 
operation and the Commission will provide this information to the data base managers.  Parties 
responsible for eligible event venues filing registration requests must certify that they are making use of 
all TV channels not available to TV bands devices and on which wireless microphones can practicably be 
used, including channels 7-51 (except channel 37).  The Commission will make requests for registration 
of sites that use unlicensed wireless microphones public and will provide an opportunity for public 
comment or objections.  Registrations will be valid for one year, after which they may be renewed.  The 
Commission will take actions against parties that file inaccurate or incomplete information, such as denial 
of registration in the database, removal of information from the database pursuant to Section 15.713(i), or 
other sanctions as appropriate to ensure compliance with the rules.  Registrations must include the 
following information:
(i) name of the individual or business that owns the unlicensed wireless microphones
(ii) an address for the contact person
(iii) an email address for the contact person (optional) 
(iv) a phone number for the contact person
(v) coordinates where the device(s) are used (latitude and longitude in NAD 83, accurate to +/- 50 m)
(vi) channels used by the wireless microphones operated at the site and the number of wireless 
microphones used in each channel.  As a benchmark, least 6 – 8 wireless microphones must be used in 
each channel.  Registration requests that do not meet this criteria will not be registered in the TV bands 
data bases.
(vii) specific months, weeks, days of the week and times when the device(s) are used (on dates when 
microphones are not used the site will not be protected)
(viii) the name of the venue
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12. In Appendix A, Section 15.717(b) is corrected to read:
(b)  Power limit for devices that rely on sensing.  The TVBD shall meet the requirements for 
personal/portable devices in this subpart except that it will be limited to a maximum EIRP of 50 mW per 
6 megahertz of bandwidth on which the device operates and it does not have to comply with the 
requirements for geo-location and database access in § 15.711(b).  Compliance with the detection
threshold for spectrum sensing in § 15.717(c), although required, is not necessarily sufficient for 
demonstrating reliable interference avoidance.  Once a device is certified, additional devices that are 
identical in electrical characteristics and antenna systems may be certified under the procedures of Part 2, 
Subpart J of this chapter.
13. Accordingly, pursuant to the authority contained in Sections 4(i), 302, 303(e), 303(f), and 307 
of the Communications Act of 1934, as amended, 47 U.S.C. Sections 154(i), 302, 303(c), 303(f), and 307 
this Erratum IS ADOPTED.
FEDERAL COMMUNICATIONS COMMISSION
Julius P. Knapp
Chief, Office of Engineering and Technology