**DA 02-1319**

**Released: June 6, 2002**

WIRELESS TELECOMMUNICATIONS BUREAU ACCEPTS AND APPROVES\
CONSENSUS ANALYTICAL METHOD FOR DETERMINING\
ADDITIONAL FREQUENCY COORDINATION REQUIREMENTS\
FOR CERTAIN PRIVATE LAND MOBILE 150-470 MHz APPLICATIONS

By this *Public Notice*, the Wireless Telecommunications Bureau (Bureau)
accepts and approves the consensus analytical method for determining
whether Private Land Mobile Radio (PLMR) applications "trigger" the
additional frequency coordination requirements of Sections
90.35(b)(2)(iii) and 90.175(b) of the Commission's Rules.[^1] This
consensus analytical method was recommended by the Commission's
certified frequency advisory committees ("FACs" or "coordinators") for
PLMR spectrum.

By way of background, applications for new or modified facilities on
frequencies below 512 MHz shared by the former Power, Petroleum,
Railroad, Manufacturers, Forest Products, Telephone Maintenance, Motor
Carrier and/or Automobile Emergency Radio Services prior to the
Commission's consolidation of such services into a single
Industrial/Business (I/B) Pool may be coordinated by any FCC-certified
I/B Pool coordinator.[^2] However, if the interference contour of a
proposed station (19 dBu contour and 21 dBu contour for VHF and UHF,
respectively) would overlap the service contour of an existing station
licensed on one of these previously shared frequencies (37 dBu contour
and 39 dBu contour for VHF and UHF, respectively), the written
concurrence of the coordinator associated with the industry for which
the existing station license was issued, or the written concurrence of
the licensee of the existing station, must be obtained.[^3] The
coordinators' engineering studies are not filed with the Commission
unless specifically requested by the Commission's staff.

The Commission required that all FCC-certified coordinators reach a
consensus on (1) a common analytical method for determining co-channel
contour overlap using the values provided in Section 90.35(b)(2)(iii) of
the Commission's Rules, and (2) adjacent channel service/interference
contour values.[^4] On June 26, 2001, the Land Mobile Communications
Council (LMCC), which includes all of the FACs as members, reported on
the common analytical method for co-channel contour overlap agreed to by
all the coordinators.[^5] The LMCC also reported on the adjacent channel
service/interference contour values agreed to by all the
coordinators.[^6] Accordingly, we hereby approve and accept the
consensus agreement as set forth in the Attachment hereto.

For further information, contact Mr. Tom Eng of the Policy and Rules
Branch, Public Safety and Private Wireless Division, Wireless
Telecommunications Bureau at (202) 418-0019, TTY (202) 418-7233,
<teng@fcc.gov>.

Action by the Chief, Public Safety and Private Wireless Division,
Wireless Telecommunications Bureau.

-FCC-

The Frequency Advisory Committees' (FACs) consensus on a common
analytical method for determining contour overlap is to be used when
coordinating frequencies that, prior to consolidation into the
Industrial/Business Pool, were shared by eligibles in following former,
industry-specific radio services:

-   Power

-   Petroleum

-   Railroad

-   Manufacturers

-   Forest Products

-   Telephone Maintenance

-   Motor Carrier

-   Automobile Emergency

> For [co-channel]{.underline} operations, the consensus values are 37
> dBu and 39 dBu for the VHF and UHF service contours (50,50),
> respectively; and 19 dBu and 21 dBu for the VHF and UHF interference
> contours (50,10), respectively.
>
> For [adjacent channel]{.underline} operations, the consensus relies on
> a de-rating factor that is applicable when a 12.5 kHz narrowband
> applicant seeks to use channels offset from wideband incumbents using
> 25 kHz bandwidth equipment. It is also applicable when a 25 kHz
> wideband applicant seeks to use channels offset from narrowband
> incumbents using 12.5 kHz equipment. Note: the consensus is **not**
> applicable when applicants are seeking adjacent channels offset by
> 7.5 kHz or 6.25 kHz. The FACs will treat such requests as co-channel
> operations subject to the contour values noted above.
>
> In the [VHF band]{.underline}, for proposed systems offset in
> frequency by 15 kHz, the de-rating factor is 23.2 dB. The factor is
> added to the co-channel interference contour value of 19 dBu,
> producing a 42.2 dBu (50,10) interference contour.
>
> This results in a 37/42.2 dBu overlap criteria. In other words, if the
> proposed system's 42.2 dBu (50,10) interference contour overlaps an
> incumbent's 37 dBu (50,50) service contour, concurrence from the
> incumbent's coordinator, or the incumbent itself, will be sought.
>
> In the [UHF band]{.underline}, for proposed systems offset in
> frequency by 12.5 kHz, the de-rating factor is 12.5 dB. The factor is
> added to the co-channel interference contour value of 21 dBu,
> producing a 33.5 dBu (50,10) interference contour.
>
> This results in a 39/33.5 dBu overlap criteria. In other words, if the
> proposed system's 33.5 dBu (50,10) interference contour overlaps an
> incumbent's 39 dBu (50,50) service contour, concurrence from the
> incumbent's coordinator, or the incumbent itself, will be sought.

**[*Fifth MO&O*, PR Docket No. 92-235, Shared Frequency List
(MHz)]{.underline}**

153.035

153.0425

153.050

153.0575

153.065

153.0725

153.080

153.0875

153.095

153.1025

153.110

153.1175

153.125

153.1325

153.140

153.1475

153.155

153.1625

153.170

153.1775

153.185

153.1925

153.200

153.2075

153.215

153.2225

153.230

153.2375

153.245

153.2525

153.260

153.2675

153.275

153.2825

153.290

153.2975

153.305

153.3125

153.320

153.3275

153.335

153.3425

153.350

153.3575

153.365

153.3725

153.380

153.3875

153.395

153.4025

153.425

153.4325

153.440

153.4475

153.455

153.4625

153.485

153.4925

153.500

153.5075

153.515

153.5225

153.545

153.5525

153.560

153.5675

153.575

153.5825

153.605

153.6125

153.620

153.6275

153.635

153.6425

153.665

153.6725

153.680

153.6875

158.145

158.1525

158.160

158.1675

158.175

158.1825

158.205

158.2125

158.220

158.2275

158.235

158.2425

158.265

158.2725

158.280

158.2875

158.295

158.3025

158.310

158.3175

158.325

158.3325

158.355

158.3625

158.370

158.3775

158.415

158.4225

158.430

158.4375

173.250

173.300

173.350

451.175

451.225

451.275

451.375

451.425

451.475

451.525

451.550

451.575

451.600

451.625

451.650

451.675

451.700

451.750

452.325

452.375

452.425

452.475

452.775

452.825

452.875

456.175

456.225

456.275

456.375

456.425

456.475

456.525

456.550

456.575

456.600

456.625

456.650

456.675

456.700

456.750

457.325

457.375

457.425

457.475

457.775

457.825

457.875

462.475

462.525

467.475

467.525

[^1]: 47 C.F.R. §§ 90.35(b)(2)(iii), 90.175(b) (2002). *See also 1998
    Biennial Regulatory Review − 47 C.F.R. Part 90 - Private Land Mobile
    Radio Services, WT Docket No. 98‑182, Memorandum Opinion and Order
    and Second Report and Order,* FCC 02-139 ¶ 46 (rel. May 23, 2002).

[^2]: *See id. See also* Letter from Robert M. Gurss, Esq., President,
    Land Mobile Communications Council, to Thomas J. Sugrue, Esq.,
    Chief, Wireless Telecommunications Bureau, FCC, dated June 26, 2001,
    at 2 (LMCC Letter).

[^3]: *See* note Error: Reference source not found, *supra*. *See also*
    LMCC Letter at 2.

[^4]: 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, *Fifth
    Memorandum Opinion and Order*, 16 FCC Rcd 416 (2000) (*Fifth MO&O*).

[^5]: LMCC Letter. The letter includes a list of specific frequencies.
    *See* *id*., Attachment A.

[^6]: *Id.* at 2.