Before the

**Federal Communications Commission**

**Washington, D.C. 20554**

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| In the Matter of                 | * | WT Docket No. 96-86          |
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SIXTH NOTICE OF PROPOSED RULE MAKING

**Adopted**: September 27, 2002 **Released**: October 4, 2002

**Comment Date:** \[30 days after Federal Register Publication\]

**Reply Comment Date:** \[45 days after Federal Register Publication\]

By the Commission:

Table of Contents

Heading Paragraph

I. INTRODUCTION AND EXECUTIVE SUMMARY 1

II\. Background 2

III\. Discussion 5

A. Section 90.543(a) -- ACCP Values for the 37.5 kHz Frequency Offset 6

B. Section 90.543(a) -- ACCP Values for the 350 kHz Frequency Offset 8

C. Section 90.543(a) -- ACCP Values for Base Station Frequency Offsets
Greater than 400 kHz 9

D. Section 90.543(a) -- Clarification that Values for Offsets Greater
than 400 kHz Apply Above and Below Authorized Center Frequency 10

E. Section 90.543(a) -- Deletion of ACCP Absolute (dBm) Values for
Mobiles 15

F. Terminology Update 17

G. Section 27.53(d) -- Corresponding Changes to ACCP Values for
Transmitters Operating in the 700 MHz Guard Bands 18

IV\. Conclusion 19

V. PROCEDURAL MATTERS 20

A. Ex Parte Rules -- Permit-But-Disclose Proceeding 20

B. Paperwork Reduction Act 21

C. Regulatory Flexibility Act 22

D. Comment Dates 23

E. Further Information 26

VI\. Ordering Clauses 28

appendix a Proposed Rule Changes

APPENDIX B Initial Regulatory Flexibility Certification

# INTRODUCTION AND EXECUTIVE SUMMARY

1.  In this *Sixth Notice of Proposed Rule Making* (*Sixth NPRM*), we
    request comment on our tentative conclusion that adopting revisions
    to Section 90.543 of our Rules[^1] as proposed herein would serve
    the public interest. These proposed rule changes would align the
    Commission's rules with industry standards documents and revise the
    values for Adjacent Channel Coupled Power ("ACCP") emission limits
    for public safety transmitters operating in the 764-776 and 794-806
    MHz frequency bands ("700 MHz band"). The proposed values reflect an
    industry consensus in response to the Commission's request in the
    *Second Memorandum Opinion and Order* in this proceeding.[^2]

# Background

2.  Historically, public safety communications systems consisted of
    analog 25 kHz frequencies for voice communications. While recent
    years have seen the increased use of mobile data terminals, most
    data applications have been accommodated within the channel and
    technical requirements designed for voice transmissions. As a
    result, the Commission's requirements regarding emission limits
    generally have not distinguished between voice and data
    transmissions.

3.  In the *First Report and Order* in this proceeding, the Commission
    recognized that the 700 MHz band offers the opportunity for public
    safety agencies to enter full-scale into digital communications. In
    this regard, it noted that it was critical that its rules keep pace
    with and recognize the diversity of equipment that will become
    available in the future.[^3] Consequently, rather than setting
    emission masks for the various types of communications, the
    Commission adopted Section 90.543, which sets forth emission limits
    for the 700 MHz band based on ACCP.[^4] ACCP is an emission limit
    based upon the absolute and relative levels of coupled power as a
    function of frequency that ensures that the adjacent channel
    interference potential of transmitters at various bandwidths is
    consistent and predictable.[^5]

4.  Several parties filed petitions for reconsideration regarding
    Section 90.543 as adopted by the *First R&O*. Although generally
    supportive of the ACCP concept, these petitioners contended that
    further analysis was required to establish the appropriate
    intercepted adjacent band power levels that will cause interference
    to an adjacent channel receiver, and to translate these values into
    corresponding ACCP requirement values.[^6] The Commission resolved
    these petitions by retaining Section 90.543 as adopted in the *First
    R&O* and inviting the industry to develop consensus recommendations
    for ACCP values.[^7] In response, the Private Radio Section ("PRS")
    of the Wireless Communications Division of the Telecommunications
    Industry Association ("TIA") filed industry consensus
    recommendations for changes to Section 90.543.[^8] PRS states that
    these recommendations are "the consensus opinion of manufacturers
    interested in building 700 MHz public safety band equipment based on
    current technology."[^9]

#  Discussion

5.  Section 90.543 sets forth absolute and relative ACCP limits for
    mobile transmitters and base transmitters operating, *inter alia*,
    on bandwidths of 6.25 kHz, 12.5 kHz or 25 kHz. For each mobile or
    base bandwidth, the rule provides ACCP maximum values measured at a
    series of frequencies offset from the center frequency of the
    transmitter's authorized channel, *e.g.,* at a frequency offset from
    the center frequency by 6.25, 12.5, 18.75, 25, 37.5 kHz.[^10]
    Accordingly, the industry consensus consists of various proposals to
    revise the values now specified in Section 90.543(a). We address
    each recommendation below.

## Section 90.543(a) -- ACCP Values for the 37.5 kHz Frequency Offset

6.  Section 90.543(a) specifies a maximum ACCP relative value of --65dBc
    for the measurement taken at a frequency offset 37.5 kHz from the
    center frequency of 12.5 kHz and 25 kHz mobile transmitters. PRS
    notes that this value is more stringent than the --60 dBc value that
    governs corresponding base stations.[^11] PRS opines that the --65
    dBc value for mobiles may have been an error because mobile stations
    are not normally required to meet requirements more stringent than
    those required of base stations.[^12] In this connection, PRS
    recommends we harmonize the requirement for base and mobile
    transmitters by modifying the ACCP table value for the 37.5 kHz
    frequency offset from a limit of --65 dBc to --60 dBc.[^13]

7.  We agree with PRS that emission limitation requirements for base
    stations are usually more stringent than those of mobile stations
    because base stations are more likely to cause harmful interference
    than mobile stations. Further, we concur that the ACCP values for
    the 37.5 kHz frequency offset for mobile transmitters should be less
    stringent than those for the corresponding base stations.
    Accordingly, we propose to revise Section 90.543(a) to provide that
    the Maximum ACCP Relative value for the 37.5 kHz frequency offset is
    --60 dBc for 12.5 kHz and 25 kHz mobile transmitters. We seek
    comment on this proposal.

## Section 90.543(a) -- ACCP Values for the 350 kHz Frequency Offset 

8.  PRS states that none of the ACCP tables contained in Section 90.543
    limit emissions in the frequency offset range between 300 and 400
    kHz.[^14] In this connection, PRS recommends that a new row be added
    to these tables to specify an ACCP limit of --65 dBc at the 350 kHz
    offset using 100 kHz measurement bandwidth.[^15] We note that the
    recommendation reflects industry consensus and that it is equivalent
    to the value currently governing the frequency offset at 250 kHz
    center frequency. Accordingly, we propose to amend Section 90.543 in
    accordance with this recommendation and we request comment on this
    proposal.

## Section 90.543(a) -- ACCP Values for Base Station Frequency Offsets Greater than 400 kHz

9.  For base stations, Section 90.543(a) uses a formula to set maximum
    ACCP limits for measurements at offsets ("displacements") from the
    authorized center frequency greater than 400 kHz up to the receive
    band. The values are --80 dBc at 400 kHz and continue at the rate of
    --6dB/octave up to the receive band. As the industry correctly
    notes, this could result in a required ACCP limit of --116 dBc
    before reaching the base receive band,[^16] which is located between
    30 MHz and 42 MHz away from base transmitter band.[^17] However,
    under Section 90.543(a), the maximum ACCP limit for frequency
    displacements in the receive band is --100 dBc.[^18] We believe
    implementing a --80 dBc limit for frequency displacements between
    400 kHz and the receive band, and a --100 dBc limit for frequencies
    in the receive band would eliminate the potential for conflicting
    requirements. We seek comment on this proposal.

## Section 90.543(a) -- Clarification that Values for Offsets Greater than 400 kHz Apply Above and Below Authorized Center Frequency

10. In another suggestion intended to clarify the Commission's Rules,
    the industry, through PRS, recommends replacement of the row
    entitled "\>400 to receive Band" in the ACCP tables contained in
    Section 90.543 with two new, more specific, rows.[^19] For example,
    Section 90.543(a) now specifies a mobile value of --75 dBc for
    offsets "greater than 400 kHz to receive band." For mobiles, the
    receive band is at 764-776 MHz, which ends 18 megahertz below the
    start of the mobile transmit band at 794-806 MHz. Under the current
    rule, it is arguable that mobiles need only meet the ‑75dBc limit
    for offsets greater than 400 kHz that fall between 776 MHz and 794
    MHz. Alternatively stated, it is arguable under the current rule
    that mobiles operating near 794 MHz need not meet the ‑75dBc limit
    for offsets greater than 400 kHz that fall between 794 MHz and 806
    MHz. Such interpretation is premised on the notion that the "to
    receive band" language in the rule implies that the value only
    applies relative to the receive band.

11. PRS recommends that we replace the row entitled "\>400 to receive
    Band" in the mobile transmitter tables with two new rows, to ensure
    consideration of unwanted emissions offset more than 400 kHz above
    the mobile station carrier.[^20] The first row would govern offsets
    greater than 400 kHz up to 12 MHz, which would include all emissions
    within 12 MHz (plus or minus) from a mobile transmitter, including
    the entire 794-806 MHz band.[^21] The second row would govern the
    remaining range from 12 MHz below the transmitter frequency to the
    764-776 MHz mobile receive band.[^22] PRS recommends that the ACCP
    limit remain at --75 dBc.[^23]

12. We agree that PRS's recommendations better reflect the underlying
    purpose of the rule. The purpose of the rule is to control in-band
    emissions on adjacent public safety channels by clarifying that the
    ACCP values for offsets greater than 400 kHz govern emissions both
    above and below the authorized center carrier.[^24] Given that the
    mobile segment of the 700 MHz band spans twelve megahertz of
    spectrum (794-806 MHz), we believe that specifying ACCP values for
    "\>400 kHz to 12 MHz" would clarify that mobiles operating near 794
    MHz must not exceed the ACCP values intended to protect public
    safety mobiles operating at frequencies up to 806 MHz. We therefore
    tentatively conclude that we should revise Section 90.543
    accordingly. We seek comment on this tentative conclusion.

13. In addition, PRS recommends that we replace the row entitled "\>400
    to receive Band" in the base transmitter tables with two rows for
    reasons similar to those underlying its request for the mobile
    transmitter tables, *i.e.*, to ensure consideration of unwanted
    emissions offset more than 400 kHz below the base station
    carrier.[^25] The first row would govern offsets greater than 400
    kHz up to 12 MHz, which would apply to all emissions within 12 MHz
    from base transmitter, including the 764-776 MHz band.[^26] The
    second row would govern the remaining range from above 12 MHz to the
    base receive band (794-806 MHz).[^27] PRS recommends that the ACCP
    limit remain at --80 dBc.[^28]

14. Given that the base segment of the 700 MHz band also spans twelve
    megahertz of spectrum (764-776 MHz), we agree with these
    recommendations for the same reasons that we agree with the
    recommended changes to the mobile transmitter tables described
    above.[^29] We therefore tentatively conclude that we should revise
    Section 90.543 in accordance with the recommendations. We seek
    comment on this tentative conclusion.

## Section 90.543(a) -- Deletion of ACCP Absolute (dBm) Values for Mobiles 

15. In the *First R&O*, the Commission adopted Section 90.531(d) which
    required all mobile and portable transmitters operating in the 700
    MHz band to employ automatic power control ("APC").[^30] The
    Commission simultaneously adopted Section 90.543 which, *inter
    alia*, set absolute emission limitations specifying how mobiles and
    portables could meet ACCP requirements using APC.[^31] In the
    *Second MO&O*, however, the Commission, persuaded by petitions for
    reconsideration asserting that APC was incompatible with most public
    safety dispatch systems, made APC optional for 700 MHz band mobiles
    and portables.[^32] The Commission, however, did not amend Section
    90.543 to account for this change.

16. We concur with the consensus opinion that this omission could result
    in Section 90.543 being erroneously interpreted as requiring fixed
    power output transmitters (*e.g.*, those used for public safety
    applications based on Project 25's constant envelope modulation
    type) to meet two different ACCP requirements (relative ACCP and
    absolute ACCP) at the maximum output power of the radio.[^33] PRS
    suggests that we clarify Section 90.543 by making the requirement
    for mobile transmitters consistent with the requirement for base
    station transmitters, which must only meet relative ACCP
    requirements.[^34] We believe that we can accomplish this by
    deleting the "Maximum ACCP Absolute (dBm)" column from the mobile
    transmitter tables set forth in Section 90.543. We further note that
    equipment designed to comply with the current rules would comply
    with these changes. We therefore propose to amend our rules
    accordingly and seek comment on this proposal.

## Terminology Update

17. In the interest of harmonizing the terminology contained in the
    Commission's rules with that used by the industry, the industry,
    through PRS, recommends changing the ACCP terminology in our rules
    to the Adjacent Channel Power (ACP) terminology referenced in
    industry standards documents.[^35] Similarly, the industry
    recommends amending Section 90.543(c) to change the out of band
    emission limit reference from "unmodulated carrier power (P)" to
    "mean output power (P)."[^36] PRS notes that primary emissions in
    this band are required to be digital,[^37] which in some instances
    may utilize suppressed carrier modulation. Therefore, some
    transmitters may not normally generate, and may not be capable of
    generating, an unmodulated carrier.[^38] We agree with PRS and
    tentatively conclude to amend our rules accordingly. We seek comment
    on our proposed rule changes.

## Section 27.53(d) -- Corresponding Changes to ACCP Values for Transmitters Operating in the 700 MHz Guard Bands

18. Section 27.53(d) of our Rules[^39] requires transmitters operating
    in the 700 MHz guard bands (the 746-747 MHz, 762-764 MHz, 776-777
    MHz, and 792-794 MHz bands) to meet emission limits identical to
    those set forth in Section 90.543.[^40] Accordingly, for the same
    reasons discussed above relative to Section 90.543, we propose to
    adopt corresponding revisions to Section 27.53(d).[^41]

# Conclusion

19. We recognize and appreciate the amount of effort that the industry
    expended in responding to the Commission's request for an industry
    consensus on ACCP emission limits. Moreover, we welcome the
    industry's assistance in our continual campaign to clarify our rules
    and ensure that they accurately reflect our decisions. In view of
    the foregoing, we propose certain changes to the rules governing
    emission limits in the 700 MHz band. The proposed rule changes
    discussed in this *Sixth Notice of Proposed Rule Making* are
    intended to remove potentially conflicting regulations, enhance the
    clarity of the regulations and ensure that the terminology contained
    in these rules comports with the terminology utilized by the
    industry.

# PROCEDURAL MATTERS

## Ex Parte Rules -- Permit-But-Disclose Proceeding

20. This is a permit-but-disclose notice and comment rule making
    proceeding. *Ex parte* presentations are permitted, except during
    the Sunshine Agenda period, provided they are disclosed as provided
    in our Rules.[^42]

## Paperwork Reduction Act 

21. This *Sixth NPRM* does not contain either a proposed or modified
    information collection.

## Regulatory Flexibility Act

22. *Initial Regulatory Flexibility Certification*. We have prepared an
    Initial Regulatory Flexibility Certification concerning the impact
    on small entities of the policies and rules proposed by this *Sixth
    NPRM*. The Initial Regulatory Flexibility Certification is set forth
    in Appendix B.

## Comment Dates

23. Pursuant to Sections 1.415 and 1.419 of the Commission\'s rules, 47
    C.F.R. §§ 1.415, 1.419, interested parties may file comments on or
    before **\[insert date\]**, and reply comments on or before
    **\[insert date\]**. Comments may be filed using the Commission\'s
    Electronic Comment Filing System (ECFS) or by filing paper copies.
    [See]{.underline} [Electronic Filing of Documents in Rulemaking
    Proceedings]{.underline}, 63 Fed. Reg. 24121 (1998).

24. Comments filed through the ECFS can be sent as an electronic file
    via the Internet to \<http://www.fcc.gov/e-file/ecfs.html\>.
    Generally, only one copy of an electronic submission must be filed.
    If multiple docket or rulemaking numbers appear in the caption of
    this proceeding, however, commenters must transmit one electronic
    copy of the comments to each docket or rulemaking number referenced
    in the caption. In completing the transmittal screen, commenters
    should include their full name, U.S. Postal Service mailing address,
    and the applicable docket or rulemaking number. Parties may also
    submit an electronic comment by Internet e-mail. To get filing
    instructions for e-mail comments, commenters should send an e-mail
    to ecfs@fcc.gov, and should include the following words in the body
    of the message, \"get form \<your e-mail address\>.\" A sample form
    and directions will be sent in reply.

25. Parties who choose to file by paper must file an original and four
    copies of each filing. If more than one docket or rulemaking number
    appear in the caption of this proceeding, commenters must submit two
    additional copies for each additional docket or rulemaking number.
    Filings can be sent by hand or messenger delivery, by commercial
    overnight courier, or by first-class or overnight U.S. Postal
    Service mail (although we continue to experience delays in receiving
    U.S. Postal Service mail). The Commission\'s contractor, Vistronix,
    Inc., will receive hand-delivered or messenger-delivered paper
    filings for the Commission\'s Secretary at 236 Massachusetts Avenue,
    N.E., Suite 110, Washington, D.C. 20002. The filing hours at this
    location are 8:00 a.m. to 7:00 p.m. All hand deliveries must be held
    together with rubber bands or fasteners. Any envelopes must be
    disposed of before entering the building. Commercial overnight mail
    (other than U.S. Postal Service Express Mail and Priority Mail) must
    be sent to 9300 East Hampton Drive, Capitol Heights, MD 20743. U.S.
    Postal Service first-class mail, Express Mail, and Priority Mail
    should be addressed to 445 12th Street, SW, Washington, D.C. 20554.
    All filings must be addressed to the Commission\'s Secretary, Office
    of the Secretary, Federal Communications Commission.

## Further Information

26. For further information, contact Roberto Mussenden, Esq.,
    <rmussend@fcc.gov>, Policy and Rules Branch, Public Safety and
    Private Wireless Division, Wireless Telecommunications Bureau,
    at (202) 418-0680, or TTY (202) 418-7233.

27. Alternative formats (computer diskette, large print, audiocassette
    and Braille) are available to persons with disabilities by
    contacting Brian Millin at (202) 418-0260, TTY 418-2555, or at
    <bmillin@fcc.gov>. This *Sixth* *Notice of Proposed Rule Making* can
    also be downloaded at http://www.fcc.gov/dtf/.

# Ordering Clauses

28. Accordingly, IT IS ORDERED, that pursuant to Sections 4(i), 303(f),
    332, and 403 of the Communications Act of 1934, as amended, 47
    U.S.C. §§ 154(i), 303(f), 332, 337, 405, this *Notice of Proposed
    Rulemaking* IS HEREBY ADOPTED.

29. IT IS FURTHER ORDERED THAT THE Commission's Consumer and Government
    Affairs Bureau, Reference Information Center, SHALL SEND a copy of
    this *Notice of Proposed Rule Making*, including the Regulatory
    Flexibility Certification, to the Chief Counsel for Advocacy of the
    Small Business Administration.

FEDERAL COMMUNICATIONS COMMISSION

Marlene H. Dortch

Secretary

# appendix a {#appendix-a .unnumbered}

# Proposed Rule Changes {#proposed-rule-changes .unnumbered}

Part 27 of Title 47 of the Code of Federal Regulations is proposed to be
amended as follows:

**PART 27 -- MICELLANEOUS WIRELESS COMMUNIATIONS SERVICES**

The authority citation for Part 27 continues to read as follows:

**Authority: 47 U.S.C. 154, 301, 302, 303, 307, 309, 332, 336, and 337
unless otherwise noted.**

Paragraph (d) of Section 27.53 is amended as follows:

§ 27.53 Emission limitations

\* \* \* \* \*

\(d\) For operations in the 746-747 MHz, 762-764 MHz, 776-777 MHz, and
792-794 MHz bands, transmitters must meet the following emission
limitations:

\(1\) The adjacent channel power (ACP) requirements for transmitters
designed for various channel sizes are shown in the following tables.
Mobile station requirements apply to handheld, car mounted and control
station units. The tables specify a value for the ACP as a function of
the displacement from the channel center frequency and measurement
bandwidth. In the following tables, \"(s)\" indicates a swept
measurement may be used.

6.25 kHz Mobile Transmitter ACP Requirements

+----------------------------+-----------------+----------------------+
| Offset from\               | Measurement     | Maximum              |
| Center Frequency (kHz)     |                 |                      |
|                            | Bandwidth       | ACP                  |
|                            |                 |                      |
|                            | (kHz)           | (dBc)                |
+----------------------------+-----------------+----------------------+
| 6.25                       | 6.25            | -40                  |
+----------------------------+-----------------+----------------------+
| 12.5                       | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 18.75                      | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 25.00                      | 6.25            | -65                  |
+----------------------------+-----------------+----------------------+
| 37.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 62.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 87.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 150.00                     | 100.00          | -65                  |
+----------------------------+-----------------+----------------------+
| 250.00                     | 100.00          | -65                  |
+----------------------------+-----------------+----------------------+
| 350.00                     | 100.00          | -65                  |
+----------------------------+-----------------+----------------------+
| \>400 kHz to 12 MHz        | 30 (s)          | -75                  |
+----------------------------+-----------------+----------------------+
| 12 MHz to paired receive   | 30 (s)          | -75                  |
| band                       |                 |                      |
+----------------------------+-----------------+----------------------+
| In the paired\             | 30 (s)          | -100                 |
| receive band               |                 |                      |
+----------------------------+-----------------+----------------------+

**12.5 kHz Mobile Transmitter ACP Requirements**

+----------------------------+-----------------+----------------------+
| Offset from\               | Measurement     | Maximum              |
| Center Frequency (kHz)     |                 |                      |
|                            | Bandwidth       | ACP                  |
|                            |                 |                      |
|                            | (kHz)           | (dBc)                |
+----------------------------+-----------------+----------------------+
| 9.375                      | 6.25            | -40                  |
+----------------------------+-----------------+----------------------+
| 15.625                     | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 21.875                     | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 37.50                      | 25.00           | -60                  |
+----------------------------+-----------------+----------------------+
| 62.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 87.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 150.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 250.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 350.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| \>400 to 12 MHz            | 30 (s)          | -75                  |
+----------------------------+-----------------+----------------------+
| 12 MHz to paired receive   | 30 (s)          | -75                  |
| band                       |                 |                      |
+----------------------------+-----------------+----------------------+
| In the paired\             | 30 (s)          | -100                 |
| receive band               |                 |                      |
+----------------------------+-----------------+----------------------+

25 kHz Mobile Transmitter ACP Requirements

+----------------------------+-----------------+----------------------+
| Offset from\               | Measurement     | Maximum ACP (dBc)    |
| Center Frequency (kHz)     |                 |                      |
|                            | Bandwidth (kHz) |                      |
+----------------------------+-----------------+----------------------+
| 15.625                     | 6.25            | -40                  |
+----------------------------+-----------------+----------------------+
| 21.875                     | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 37.50                      | 25              | -60                  |
+----------------------------+-----------------+----------------------+
| 62.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 87.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 150.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 250.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 350.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| \>400kHz to 12 MHz         | 30 (s)          | -75                  |
+----------------------------+-----------------+----------------------+
| 12 MHz to paired receive   | 30 (s)          | -75                  |
| band                       |                 |                      |
+----------------------------+-----------------+----------------------+
| In the paired\             | 30 (s)          | -100                 |
| receive band               |                 |                      |
+----------------------------+-----------------+----------------------+

150 kHz Mobile Transmitter ACP Requirements

+---------------------+-------------+----------------+----------------+
| Offset from\        | Measurement | Maximum ACP    | Maximum ACP    |
| Center Frequency    |             | Relative (dBc) | Absolute (dBc) |
| (kHz)               | Bandwidth   |                |                |
|                     | (kHz)       |                |                |
+---------------------+-------------+----------------+----------------+
| 100                 | 50          | -40            | Not specified  |
+---------------------+-------------+----------------+----------------+
| 200                 | 50          | -50            | -35            |
+---------------------+-------------+----------------+----------------+
| 300                 | 50          | -50            | -35            |
+---------------------+-------------+----------------+----------------+
| 400                 | 50          | -50            | -35            |
+---------------------+-------------+----------------+----------------+
| 600-1000            | 30(s)       | -60            | -45            |
+---------------------+-------------+----------------+----------------+
| 1000 to receive     | 30(s)       | -70            | -55            |
| band                |             |                |                |
+---------------------+-------------+----------------+----------------+
| In the receive band | 30(s)       | -100           | -75            |
+---------------------+-------------+----------------+----------------+

6.25 kHz Base Transmitter ACP Requirements

+----------------------------+-----------------+----------------------+
| Offset from                | Measurement     | Maximum ACP (dBc)    |
|                            | Bandwidth (kHz) |                      |
| Center Frequency (kHz)     |                 |                      |
+----------------------------+-----------------+----------------------+
| 6.25                       | 6.25            | -40                  |
+----------------------------+-----------------+----------------------+
| 12.50                      | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 18.75                      | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 25.00                      | 6.25            | -65                  |
+----------------------------+-----------------+----------------------+
| 37.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 62.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 87.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 150.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 250.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 350.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| \>400 to 12 MHz            | 30 (s)          | -80                  |
+----------------------------+-----------------+----------------------+
| 12 MHz to paired receive   | 30(s)           | -80                  |
| band                       |                 |                      |
+----------------------------+-----------------+----------------------+
| In the paired\             | 30 (s)          | -100                 |
| receive band               |                 |                      |
+----------------------------+-----------------+----------------------+

12.5 kHz Base Transmitter ACP Requirements

  ----------------------------- ------------------ ----------------------
  Offset from\                  Measurement        Maximum ACP (dBc)
  Center Frequency (kHz)        Bandwidth (kHz)    

  9.375                         6.25               -40

  15.625                        6.25               -60

  21.875                        6.25               -60

  37.5                          25                 -60

  62.5                          25                 -65

  87.5                          25                 -65

  150                           100                -65

  250                           100                -65

  350.00                        100                -65

  \>400 kHz to 12 MHz           30 (s)             -80

  12 MHz to paired receive band 30 (s)             -80

  In the paired\                30 (s)             -100
  receive band                                     
  ----------------------------- ------------------ ----------------------

25 kHz Base Transmitter ACP Requirements

  --------------------------- -------------------- -----------------------
  Offset from\                Measurement          Maximum ACP (dBc)
  Center Frequency (kHz)      Bandwidth (kHz)      

  15.625                      6.25                 -40

  21.875                      6.25                 -60

  37.5                        25                   -60

  62.5                        25                   -65

  87.5                        25                   -65

  150                         100                  -65

  250                         100                  -65

  350                         100.00               -65

  \>400 kHz to12 MHz          30(s)                -80

  12 MHz to paired receive    30 (s)               -80
  band                                             

  In the paired\              30 (s)               -100
  receive band                                     
  --------------------------- -------------------- -----------------------

150 kHz Base Transmitter ACP Requirements

+----------------------------+-----------------+----------------------+
| Offset from                | Measurement     | Maximum ACP (dBc)    |
|                            | Bandwidth (kHz) |                      |
| Center Frequency (kHz)     |                 |                      |
+----------------------------+-----------------+----------------------+
| 100                        | 50              | -40                  |
+----------------------------+-----------------+----------------------+
| 200                        | 50              | -50                  |
+----------------------------+-----------------+----------------------+
| 300                        | 50              | -55                  |
+----------------------------+-----------------+----------------------+
| 400                        | 50              | -60                  |
+----------------------------+-----------------+----------------------+
| 600-1000                   | 30(s)           | -65                  |
+----------------------------+-----------------+----------------------+
| 1000 to receive band       | 30(s)           | -75 (continues at    |
|                            |                 | -6dB/oct)            |
+----------------------------+-----------------+----------------------+
| In the receive band        | 30(s)           | -100                 |
+----------------------------+-----------------+----------------------+

\(2\) *ACP measurement procedure*. The following procedures are to be
followed for making ACP transmitter measurements. For time division
multiple access (TDMA) systems, the measurements are to be made under
TDMA operation only during time slots when the transmitter is on. All
measurements must be made at the input to the transmitter\'s antenna.
Measurement bandwidth used below implies an instrument that measures the
power in many narrow bandwidths (e.g. 300 Hz) and integrates these
powers across a larger band to determine power in the measurement
bandwidth.

\(i\) *Setting reference level*: Using a spectrum analyzer capable of
ACP measurements, set the measurement bandwidth to the channel size. For
example, for a 6.25 kHz transmitter, set the measurement bandwidth to
6.25 kHz; for a 150 kHz transmitter, set the measurement bandwidth to
150 kHz. Set the frequency offset of the measurement bandwidth to zero
and adjust the center frequency of the spectrum analyzer to give the
power level in the measurement bandwidth. Record this power level in dBm
as the \"reference power level\".

\(ii\) *Non-swept power measurement*: Using a spectrum analyzer capable
of ACP measurements, set the measurement bandwidth as shown in the
tables above. Measure the ACP in dBm. These measurements should be made
at maximum power. Calculate the coupled power by subtracting the
measurements made in this step from the reference power measured in the
previous step. The absolute ACP values must be less than the values
given in the table for each condition above.

\(iii\) *Swept power measurement*: Set a spectrum analyzer to 30 kHz
resolution bandwidth, 1 MHz video bandwidth and sample mode detection.
Sweep #6 MHz from the carrier frequency. Set the reference level to the
RMS value of the transmitter power and note the absolute power. The
response at frequencies greater than 600 kHz must be less than the
values in the tables above.

\(iv\) \[deleted\]

\(3\) *Out-of-band emission limit.* On any frequency outside of the
frequency ranges covered by the ACP tables in this section, the power of
any emission must be reduced below the unmodulated carrier power (P) by
at least 43 + 10 log (P) dB.

\(4\) *Authorized bandwidth.* Provided that the ACP requirements of this
section are met, applicants may request any authorized bandwidth that
does not exceed the channel size.

\* \* \* \* \*

Part 90 of Title 47 of the Code of Federal Regulations is proposed to be
amended as follows:

**PART 90 - PRIVATE LAND MOBILE RADIO SERVICES**

The authority citation for Part 90 continues to read as follows:

**Authority**: **Sections 4(i), 11, 303(g), 303(r), and 332(c)(7) of the
Communications Act of 1934, as amended, 47 U.S.C. 154(i), 161, 303(g),
303(r), 332(c)(7).**

Section 90.543 is amended to read as follows:

§ 90.543 Emission limitations

Transmitters designed to operate in 764‑776 MHz and 794‑806 MHz
frequency bands must meet the emission limitations in this section.

\(a\) The adjacent channel power (ACP) requirements for transmitters
designed for various channel sizes are shown in the following tables.
Mobile station requirements apply to handheld, car mounted and control
station units. The tables specify a value for the ACP as a function of
the displacement from the channel center frequency and measurement
bandwidth. In the following tables, \"(s)\" indicates a swept
measurement may be used.

6.25 kHz Mobile Transmitter ACP Requirements

+----------------------------+-----------------+----------------------+
| Offset from\               | Measurement     | Maximum              |
| Center Frequency (kHz)     |                 |                      |
|                            | Bandwidth       | ACP                  |
|                            |                 |                      |
|                            | (kHz)           | (dBc)                |
+----------------------------+-----------------+----------------------+
| 6.25                       | 6.25            | -40                  |
+----------------------------+-----------------+----------------------+
| 12.5                       | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 18.75                      | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 25.00                      | 6.25            | -65                  |
+----------------------------+-----------------+----------------------+
| 37.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 62.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 87.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 150.00                     | 100.00          | -65                  |
+----------------------------+-----------------+----------------------+
| 250.00                     | 100.00          | -65                  |
+----------------------------+-----------------+----------------------+
| 350.00                     | 100.00          | -65                  |
+----------------------------+-----------------+----------------------+
| \>400 kHz to 12 MHz        | 30 (s)          | -75                  |
+----------------------------+-----------------+----------------------+
| 12 MHz to paired receive   | 30 (s)          | -75                  |
| band                       |                 |                      |
+----------------------------+-----------------+----------------------+
| In the paired\             | 30 (s)          | -100                 |
| receive band               |                 |                      |
+----------------------------+-----------------+----------------------+

**12.5 kHz Mobile Transmitter ACP Requirements**

+----------------------------+-----------------+----------------------+
| Offset from\               | Measurement     | Maximum              |
| Center Frequency (kHz)     |                 |                      |
|                            | Bandwidth       | ACP                  |
|                            |                 |                      |
|                            | (kHz)           | (dBc)                |
+----------------------------+-----------------+----------------------+
| 9.375                      | 6.25            | -40                  |
+----------------------------+-----------------+----------------------+
| 15.625                     | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 21.875                     | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 37.50                      | 25.00           | -60                  |
+----------------------------+-----------------+----------------------+
| 62.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 87.50                      | 25.00           | -65                  |
+----------------------------+-----------------+----------------------+
| 150.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 250.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 350.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| \>400 to 12 MHz            | 30 (s)          | -75                  |
+----------------------------+-----------------+----------------------+
| 12 MHz to paired receive   | 30 (s)          | -75                  |
| band                       |                 |                      |
+----------------------------+-----------------+----------------------+
| In the paired\             | 30 (s)          | -100                 |
| receive band               |                 |                      |
+----------------------------+-----------------+----------------------+

25 kHz Mobile Transmitter ACP Requirements

+----------------------------+-----------------+----------------------+
| Offset from                | Measurement     | Maximum ACP (dBc)    |
|                            |                 |                      |
| Center Frequency (kHz)     | Bandwidth (kHz) |                      |
+----------------------------+-----------------+----------------------+
| 15.625                     | 6.25            | -40                  |
+----------------------------+-----------------+----------------------+
| 21.875                     | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 37.50                      | 25              | -60                  |
+----------------------------+-----------------+----------------------+
| 62.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 87.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 150.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 250.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 350.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| \>400kHz to 12 MHz         | 30 (s)          | -75                  |
+----------------------------+-----------------+----------------------+
| 12 MHz to paired receive   | 30 (s)          | -75                  |
| band                       |                 |                      |
+----------------------------+-----------------+----------------------+
| In the paired\             | 30 (s)          | -100                 |
| receive band               |                 |                      |
+----------------------------+-----------------+----------------------+

150 kHz Mobile Transmitter ACP Requirements

+---------------------+-------------+----------------+----------------+
| Offset from\        | Measurement | Maximum ACP    | Maximum ACP    |
| Center Frequency    |             | Relative\      | Absolute\      |
| (kHz)               | Bandwidth   | (dBc)          | (dBc)          |
|                     | (kHz)       |                |                |
+---------------------+-------------+----------------+----------------+
| 100                 | 50          | -40            | Not specified  |
+---------------------+-------------+----------------+----------------+
| 200                 | 50          | -50            | -35            |
+---------------------+-------------+----------------+----------------+
| 300                 | 50          | -50            | -35            |
+---------------------+-------------+----------------+----------------+
| 400                 | 50          | -50            | -35            |
+---------------------+-------------+----------------+----------------+
| 600-1000            | 30(s)       | -60            | -45            |
+---------------------+-------------+----------------+----------------+
| 1000 to receive     | 30(s)       | -70            | -55            |
| band                |             |                |                |
+---------------------+-------------+----------------+----------------+
| In the receive band | 30(s)       | -100           | -75            |
+---------------------+-------------+----------------+----------------+

6.25 kHz Base Transmitter ACP Requirements

+----------------------------+-----------------+----------------------+
| Offset from                | Measurement     | Maximum ACP (dBc)    |
|                            | Bandwidth (kHz) |                      |
| Center Frequency (kHz)     |                 |                      |
+----------------------------+-----------------+----------------------+
| 6.25                       | 6.25            | -40                  |
+----------------------------+-----------------+----------------------+
| 12.50                      | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 18.75                      | 6.25            | -60                  |
+----------------------------+-----------------+----------------------+
| 25.00                      | 6.25            | -65                  |
+----------------------------+-----------------+----------------------+
| 37.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 62.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 87.50                      | 25              | -65                  |
+----------------------------+-----------------+----------------------+
| 150.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 250.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| 350.00                     | 100             | -65                  |
+----------------------------+-----------------+----------------------+
| \>400 to 12 MHz            | 30 (s)          | -80                  |
+----------------------------+-----------------+----------------------+
| 12 MHz to paired receive   | 30(s)           | -80                  |
| band                       |                 |                      |
+----------------------------+-----------------+----------------------+
| In the paired\             | 30 (s)          | -100                 |
| receive band               |                 |                      |
+----------------------------+-----------------+----------------------+

12.5 kHz Base Transmitter ACP Requirements

  ----------------------------- ------------------ ----------------------
  Offset from\                  Measurement        Maximum ACP (dBc)
  Center Frequency (kHz)        Bandwidth (kHz)    

  9.375                         6.25               -40

  15.625                        6.25               -60

  21.875                        6.25               -60

  37.5                          25                 -60

  62.5                          25                 -65

  87.5                          25                 -65

  150                           100                -65

  250                           100                -65

  350.00                        100                -65

  \>400 kHz to 12 MHz           30 (s)             -80

  12 MHz to paired receive band 30 (s)             -80

  In the paired\                30 (s)             -100
  receive band                                     
  ----------------------------- ------------------ ----------------------

25 kHz Base Transmitter ACP Requirements

  --------------------------- -------------------- -----------------------
  Offset from\                Measurement          Maximum ACP (dBc)
  Center Frequency (kHz)      Bandwidth (kHz)      

  15.625                      6.25                 -40

  21.875                      6.25                 -60

  37.5                        25                   -60

  62.5                        25                   -65

  87.5                        25                   -65

  150                         100                  -65

  250                         100                  -65

  350                         100.00               -65

  \>400 kHz to12 MHz          30(s)                -80

  12 MHz to paired receive    30 (s)               -80
  band                                             

  In the paired\              30 (s)               -100
  receive band                                     
  --------------------------- -------------------- -----------------------

150 kHz Base Transmitter ACP Requirements

  ----------------------------- ------------------ -----------------------
  Offset from\                  Measurement        Maximum ACP (dBc)
  Center Frequency (kHz)        Bandwidth (kHz)    

  100                           50                 -40

  200                           50                 -50

  300                           50                 -55

  400                           50                 -60

  600-1000                      30(s)              -65

  1000 to receive band          30(s)              -75 (continues at
                                                   6dB/oct)

  In the receive band           30(s)              -100
  ----------------------------- ------------------ -----------------------

\(b\) *ACP measurement procedure*. The following are the procedures for
making the transmitter ACP measurements. For all measurements modulate
the transmitter as it would be modulated in normal operating conditions.
For time division multiple access (TDMA) systems, the measurements are
to be made under TDMA operation only during following are procedures for
making transmitter measurements. For time division multiple access
(TDMA) systems, the measurements are to be made under TDMA operation
only during time slots when the transmitter is active. All measurements
are made at the transmitter's output port. If a transmitter has an
integral antenna, a suitable power coupling device shall be used to
couple the RF signal to the measurement instrument. The coupling device
shall substantially maintain the proper transmitter load impedance. The
ACP measurements may be made with a spectrum analyzer capable of making
direct ACP measurements. "Measurement bandwidth", as used for non-swept
measurements, implies an instrument that measures the power in many
narrow bandwidths equal to the nominal resolution bandwidth and
integrates these powers to determine the total power in the specified
measurement bandwidth..

\(1\) *Setting reference level:* Set transmitter to maximum output
power. Using a spectrum analyzer capable of ACP measurements, set the
measurement bandwidth to the channel size. For example, for a 6.25 kHz
transmitter, set the measurement bandwidth to 6.25 kHz; for a 150 kHz
transmitter, set the measurement bandwidth to 150 kHz. Set the frequency
offset of the measurement bandwidth to zero and adjust the center
frequency of the instrument to the assigned center frequency to measure
the average power level of the transmitter. Record this power level in
dBm as the \"reference power level\".

\(2\) *Non-swept power measurement:* Using a spectrum analyzer capable
of ACP measurements, set the measurement bandwidth and frequency offset
from the assigned center frequency as shown in the tables in §90.543 (a)
above. Any value of resolution bandwidth may be used as long as it does
not exceed 2% of the specified measurement bandwidth. Measure the power
level in dBm. These measurements should be made at maximum power.
Calculate ACP by subtracting the reference power level measured in
(b)(1) from the measurements made in this step. The absolute value of
the calculated ACP must be greater than or equal to the absolute value
of the ACP given in the table for each condition above

. (3) *Swept* *power measurement:* Set a spectrum analyzer to 30 kHz
resolution bandwidth, 1 MHz video bandwidth and average, sample, or RMS
detection. Set the reference level of the spectrum analyzer to the RMS
value of the transmitter power. Sweep above and below the carrier
frequency to the limits defined in the tables. Calculate ACP by
subtracting the reference power level measured in (b)(1) from the

measurements made in this step. The absolute value of the calculated ACP
must be greater than or equal to the absolute value of the ACP given in
the table for each condition above.

(4)  \[deleted\]

\(c\) *Out-of-band emission limit*. On any frequency outside of the
frequency ranges covered by the ACP tables in this section, the power of
any emission must be reduced below the mean output power (P) by at least
43 + 10log (P) dB measured in a 100 kHz bandwidth for frequencies less
than 1 GHz, and in a 1 MHz bandwidth for frequencies greater than 1 GHz.

\(d\) *Authorized bandwidth*. Provided that the ACP requirements of this
section are met, applicants may request any authorized bandwidth that
does not exceed the channel size.

\(e\) For operations in the 764 to 776 MHz and 794 to 806 MHz bands, all
emissions including harmonics in the band 1559-1610 MHz shall be limited
to -70 dBW/MHz equivalent isotropically radiated power (EIRP) for
wideband signals, and -80 dBW EIRP for discrete emissions of less than
700 Hz bandwidth. For the purpose of equipment authorization, a
transmitter shall be tested with an antenna that is representative of
the type that will be used with the equipment in normal operation.

\(f\) When an emission outside of the authorized bandwidth causes
harmful interference, the Commission may, at its discretion, require
greater attenuation than specified in this section.

# APPENDIX B {#appendix-b .unnumbered}

# Initial Regulatory Flexibility Certification {#initial-regulatory-flexibility-certification .unnumbered}

1.  The Regulatory Flexibility Act (RFA)[^43] requires that an agency
    prepare a regulatory flexibility analysis for notice-and-comment
    rulemaking proceedings, unless the agency certifies that \"the rule
    will not, if promulgated, have a significant economic impact on a
    substantial number of small entities.\"[^44] The RFA generally
    defines "small entity" as having the same meaning as the terms
    "small business," "small organization," and "small governmental
    jurisdiction."[^45] In addition, the term "small business" has the
    same meaning as the term "small business concern" under the Small
    Business Act.[^46] A "small business concern" is one which: (1) is
    independently owned and operated; (2) is not dominant in its field
    of operation; and (3) satisfies any additional criteria established
    by the Small Business Administration (SBA).[^47]

```{=html}
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```
30. In this *Sixth Notice of Proposed Rule Making* (*Notice*)*,* we
    continue our evaluation of rules applicable to the use of public
    safety spectrum in the frequencies at 764-776 MHz and 794-806 MHz
    (the 700 MHz public safety band) and the spectrally proximate 700
    MHz guard bands at 746-747 MHz, 762-764 MHz, 776-777 MHz, and
    792-794 MHz. We propose the following changes in the *Sixth*
    *Notice*:

-   revising values in the emission limit tables to ensure technological
    feasibility

-   deleting the column entitled "Maximum ACCP (dbm)"from the table
    governing ACCP requirements for mobile transmitters because these
    values are inconsistent with the Commission's decision not to
    require mobile transmitters to utilize Automatic Power Control

-   changing the terminology "Adjacent Channel Coupled Power" to
    "adjacent Channel Power" to align our rules with industry standards

    These changes, which are intended to ensure that the Commission's
    rules reflect the latest technical and industry standards, and to
    correct typographical or ministerial errors in the Commission's
    Rules, are exclusively of an administrative nature. The changes will
    not have a significant economic impact on small entities because
    they are technologically neutral and will affect all entities
    equally.

31. The Commission therefore certifies, pursuant to the RFA, that the
    proposals in this *Notice*, if adopted, will not have a significant
    economic impact on a substantial number of small entities. If
    commenters believe that the proposals discussed in the *Notice*
    require additional RFA analysis, they should include a discussion of
    these issues in their comments and additionally label them as RFA
    comments.

32. The Commission will send a copy of the *Notice*, including a copy of
    this Initial Regulatory Flexibility Certification, to the Chief
    Counsel for Advocacy of the SBA.[^48] This initial certification
    will also be published in the Federal Register.[^49]

[^1]: 47 C.F.R. § 90.543.

[^2]: *See* Development of Operational, Technical and Spectrum
    Requirements For Meeting Federal, State and Local Public Safety
    Agency Communication Requirements Through the Year 2010, WT Docket
    96-86, *Second Memorandum Opinion and Order* 15 FCC Rcd 16844, 16853
    ¶ 17 (2000) (*Second MO&O*).

[^3]: *See* Development of Operational, Technical and Spectrum
    Requirements For Meeting Federal, State and Local Public Safety
    Agency Communication Requirements Through the Year 2010, WT Docket
    96-86, *First Report and Order and Third Notice of Proposed Rule
    Making*, 14 FCC Rcd 152, 214 ¶ 138 (1998) (*First R&O)*.

[^4]: *Id.* These rules are set forth at 47 C.F.R. § 90.543. Emission
    limits are transmitter performance specifications designed to
    minimize interference to communications systems operating on other
    channels or in other bands. The interference is minimized by
    restricting the level of emissions that are unavoidably transmitted
    into adjacent channels and other parts of the spectrum. These limits
    must be carefully selected to provide acceptable adjacent channel
    protection while maximizing information transfer and thus ensuring
    efficient use of the band. Traditionally, the Commission
    emission-limit specifications involved fairly straightforward rules
    denoting authorized bandwidths and emission masks (which are
    schedules of attenuation as a function of displacement frequency)
    for various types of communications. *First R&*O, 14 FCC Rcd 213 ¶
    136*. See also* 47 C.F.R. § 90.210.

[^5]: *First R&O*, 14 FCC Rcd 214 ¶ 138. As wireless communications
    evolve, the complexity of determining compatibility between
    different types of systems increases and ACCP is an
    industry-developed method to assess compatibility within the complex
    channel environment resulting from the initial *Refarming Report and
    Order*. *See First R&O*, 14 FCC Rcd 213-14 ¶ 137 *citing*
    Replacement of Part 90 by Part 88 to Revise the Private Land Mobile
    Radio Services and Modify the Policies Governing Them and
    Examination of Exclusivity and Frequency Assignment Policies of the
    Private Land Mobile Services, PR Docket No. 92-235, *Report and
    Order and Further Notice of Proposed Rulemaking*, 10 FCC Rcd 10,076,
    10120 (1995). On any frequency outside of the frequency ranges
    covered by the ACCP tables, the power of any emission must be
    reduced below the unmodulated carrier power (P) by at least 43 + log
    (P) dB. *See* 47 C.F.R. § 90.543(c). *See also* 47 C.F.R. §§
    90.543(e)(f).

[^6]: *See Second MO&O*, 15 FCC Rcd 16844, 16852-53 ¶ 15.

[^7]: *Id.* at 16844, 16853 ¶ 16*. See also* 1998 Biennial Regulatory
    Review - 47 C.F.R. Part 90 - Private Land Mobile Radio Services,
    *Report and Order and Further Notice of Proposed Rule Making*, WT
    Docket No. 98-182, 15 FCC Rcd 16673, 16689-90 ¶¶ 33, 34 (2000)
    (noting strong industry support for ACCP and encouraging industry
    consensus on emission limitations).

[^8]: *See* Comments of the Private Radio Section of the Wireless
    Communications Division of the Telecommunications Industry
    Association, WT Docket No. 98-86, filed August 30, 2001 (PRS
    Comments). TIA is the leading trade association serving the
    communications and information technology industry, with
    approximately 1,000 member companies that manufacture or supply the
    products and services used in global communications. *Id.* at 1. TIA
    is an American National Standard Institute-accredited standards
    development organization and provides technical expertise to the
    telecommunications industry in a wide range of areas, including
    system performance, interference abatement, compatibility
    interoperability. *Id.* PRS is a section of TIA's Wireless
    Communications Division that focuses in part on the necessary
    requirements to support reliable wireless communications responding
    to the needs of the public safety entities. *Id.*, n.1. PRS (through
    its sponsored Engineering Subcommittee TR-8.6, Equipment Performance
    Recommendations) prepared the instant recommendations. *Id.* at 2.

[^9]: *See* PRS Comments at 3. PRS states these recommendations were
    developed under TIA processes and therefore represent full consensus
    opinions without meaningful objections of any participating
    manufacturer. PRS notes, however, that there are emerging
    technologies under development that may further affect the ACCP
    table recommendations. *Id.* Furthermore, PRS states that it did not
    recommend any changes to the 150 kHz bandwidth emissions limitation
    tables "at this time" because TIA Engineering Committee TR-8 is
    currently working on an industry wideband standard. *Id*. at 9.

[^10]: For example, the ACCP maximum value for 6.25 kHz mobiles is --40
    dBc (relative) --45 dBm (absolute) measured at a frequency offset
    12.5 kHz from the center frequency of the transmitter. 47 C.F.R. §
    90.543(a).

[^11]: 47 C.F.R. § 90.543(a).

[^12]: PRS Comments at 6.

[^13]: *Id*.

[^14]: *Id* at 6-7. *See* 47 C.F.R. § 90.543.

[^15]: PRS Comments at 6-7.

[^16]: PRS Comments at 8.

[^17]: *See, e.g.,* 47 C.F.R.§ 90.531(a).

[^18]: 47 C.F.R. § 90.543(a).

[^19]: PRS Comments at 7-8.

[^20]: *Id*. at 7.

[^21]: *Id*.

[^22]: *Id*.

[^23]: *Id*.

[^24]: *See, e.g.,* *First R&O*, 14 FCC Rcd at 213-14 ¶¶ 136-38.

[^25]: PRS Comments at 8.

[^26]: *Id*.

[^27]: *Id*.

[^28]: *Id*.

[^29]: We note however that we are tentatively concluding to amend the
    "Maximum ACCP (dBc) value in the "\>400 to receive Band" row from a
    formula to a set value of --80.

[^30]: *See* 47 C.F.R. § 90.531(d) (1998); *First R&O* 14 FCC Rcd at 216
    ¶ 144. APC is a system capability that allows the system to
    automatically adjust the output power for mobile and portable
    transmitters in order to maintain the minimum transmitting power
    necessary for effective communications, and to reduce interference
    potential.

[^31]: *See* 47 C.F.R. § 90.543(a).

[^32]: *See Second MO&O*, 15 FCC Rcd at 16852 ¶¶ 13-14.

[^33]: PRS Comments at 5.

[^34]: *Id.* at 6.

[^35]: *Id*. at 9.

[^36]: *Id.*

[^37]: *See* 47 C.F.R. § 90.535(a).

[^38]: PRS Comments at 9.

[^39]: 47 C.F.R. § 27.53(d).

[^40]: *See* Service Rules for the 746-764 and 776-794 MHz Bands, and
    Revisions to Part 27 of the Commission's Rules, WT Docket No.
    99-168, *Second Report and Order*, 15 FCC Rcd 5299, 5300, 5307 ¶¶ 2,
    17 (2000). The Commission, *inter alia*, adopted identical ACCP
    rules for guard band transmitters to ensure that licensees operating
    in the spectrally adjacent 700 MHz public safety band would
    experience no greater interference risk from guard band licensees
    than from other 700 MHz band public safety licensees. *Id.*

[^41]: PRS observes that "\[b\]ecause the Commission has replicated
    these very same technical standards for the 700 MHz Guard Band
    allocation, the recommendations of PRS would equally apply to FCC
    Rule Section 27.53." PRS Comments at 1.

[^42]: *See generally* 47 C.F.R. §§ 1.1202, 1.1203, 1.1206(a).

[^43]: *See* 5 U.S.C. § 603. The RFA, *see* 5 U.S.C. § 601 *et seq*.,
    has been amended by the Contract With America Advancement Act of
    1996, Pub. L. No. 104-121, 110 Stat. 847 (1996) (CWAAA). Title II of
    the CWAAA is the Small Business Regulatory Enforcement Fairness Act
    of 1996 (SBREFA).

[^44]: *See* 5 U.S.C. § 605(b).

[^45]: 5 U.S.C. § 601(6).

[^46]: 5 U.S.C § 601(3) (incorporating by reference the definition of
    "small business concern" in Small Business Act, 15 U.S.C. § 632).
    Pursuant to 5 U.S.C. § 601(3), the statutory definition of a small
    business applies "unless an agency, after consultation with the
    Office of Advocacy of the Small Business Administration and after
    opportunity for public comment, establishes one or more definitions
    of such term which are appropriate to the activities of the agency
    and publishes such definition(s) in the Federal Register."

[^47]: 15 U.S.C. § 632.

[^48]: *See* 5 U.S.C. § 605(b).

[^49]: *See* 5 U.S.C. § 605(b).