July 27, 2005

PROTOCOL
BETWEEN THE DEPARTMENT OF STATE

OF THE UNITED STATES OF AMERICA
AND THE SECRETAR�A DE COMUNICACIONES Y TRANSPORTES

OF THE UNITED MEXICAN STATES
CONCERNING THE ALLOTMENT AND USE

OF THE 406.1-420 MHz BAND
FOR FIXED AND MOBILE SERVICES

ALONG THE COMMON BORDER


This Protocol is being concluded pursuant to the Agreement Between the Government of the United States of America and the Government of the United Mexican States Concerning the Allocation and Use of Frequency Bands by Terrestrial Non-Broadcasting Radiocommunication Services Along the Common Border signed in Williamsburg, Virginia June 16, 1994, (herein referred to as the "Agreement").

ARTICLE I. Purposes


The purposes of this Protocol are:


1. To establish and adopt a plan for the equitable allotment and use of

frequency sub-bands in the 406.1-420 MHz band within the Sharing Zone defined

in this Protocol;

2. To establish technical criteria to regulate the use of the frequency sub-bands referred to in paragraph 1 of this Article;

3. To establish conditions of use so that each Administration may use the frequency sub-bands allotted to the other country for fixed and mobile services, provided this causes no harmful interference; and

4. To provide special interference protection for certain critical receiver stations specifically identified in Appendix I.


ARTICLE II. Definitions

1. For the purpose of this Protocol and as provided for in Article IV

of the Agreement, the term Administration or Administrations will refer with

equal effect to the National Telecommunications and Information Administration

of the Department of Commerce of the United States of America (hereinafter

United States) and to the Secretar�a de Comunicaciones y Transportes of the

United Mexican States (hereinafter Mexico).


2. The Sharing Zone is defined to include the border areas within the United States and Mexico and their respective territorial waters as set forth in Appendix II.

3. Special interference protection is defined as that protection from harmful interference afforded only to those critical receiver stations specifically identified in Appendix I.

ARTICLE III. Conditions of Use

1. In the Sharing Zone, the radio frequency sub-bands in the 406.1-420 MHz band shall be allotted for the primary use of each Administration in accordance with Appendix III. Each Administration shall ensure that all stations subject to its jurisdiction in the 406.1-420 MHz band are operated in such a way that the transmission bandwidth on radio channels shall not exceed the primary frequency allotments in Appendix III.

2. Each Administration shall ensure that fixed and mobile stations assigned to primary frequency allotments within the Sharing Zone shall be operated in accordance with the effective radiated power (ERP) and antenna height limitations specified in the following table (Table I):

Table I



Average of the Antenna Height Maximum ERP in Any
Above Average Terrain on Direction Toward
Standard Radials in the the Common Border
Direction of the Common
Border�

Meters Watts dBm
__________________________________________________________________

Up to 150 500 +56.98
Above 150 to 225 350 +55.44
Above 225 to 300 250 +53.98
Above 300 to 450 200 +53.01
Above 450 to 600 150 +51.76
Above 600 to 750 100 +50.00
Above 750 to 900 75 +48.75
Above 900 to 1,050 50 +46.98
Above 1,050 30 +44.77
_________________________________________________________________

Existing stations in primary frequency allotments shall conform with the above power limitations on or before January 1, 2008.

3. Each Administration shall ensure that the operation of stations on aircraft is limited to portable stations situated inside the aircraft, which have a maximum power of 5.0 watts and which do not employ antennas externally mounted on the aircraft. Such stations may only operate in the primary frequency allotments for their Administrations and at an altitude of up to 20,000 feet (6096 meters) above mean sea level. Each Administration shall take measures to eliminate any harmful interference caused by its portable stations situated inside aircraft.
____________________

� Standard radials are 000�, 045�, 090�, 135�, 180�, 225�, 270� and 315� relative to True North.


4. Frequencies in sub-bands that are allotted for the primary use of one Administration may be assigned by the other Administration to stations located within the latter Administration's territorial segment of the Sharing Zone in accordance with the following conditions:

a. The maximum power flux density (PFD) at any point at or beyond the common border shall not exceed -143 dBW/m�.

b. Land mobile stations and ship stations shall not be operated within 30 kilometers of the common border, and in addition to this distance separation, the power flux density of transmissions from land mobile stations and ship stations shall, in no case, exceed -143 dBW/m� at any point at or beyond the common border.

c. Land portable stations shall not be operated within 10 kilometers of the common border, and in addition to this distance separation, the power flux density of transmissions from portable stations shall, in no case, exceed -143 dBW/m� at any point at or beyond the common border.

d. Each Administration shall take proper measures to eliminate any harmful interference caused by stations operating within its own territory pursuant to this Protocol.

e. Each Administration shall ensure protection to stations assigned to radio frequencies in primary allotments of the other Administration operating in accord with this Protocol.

f. Stations operating in accordance with the conditions set forth in this paragraph 4 shall be considered as secondary and shall not be granted protection against harmful interference from stations whose Administration has primary use of the frequency allotment.

5. Beyond the Sharing Zone, each Administration shall have unrestricted use of the 406.1-420 MHz band.

ARTICLE IV. Transition Arrangement for Existing Stations

1. Each Administration shall ensure that existing stations within the Sharing Zone that are operating in primary frequency sub-bands allotted to the other Administration shall either cease transmissions or assume secondary status on or before January 1, 2008, in accordance with paragraph 2 or 3 below except for the stations listed in Appendix I which are governed by Article V of this Protocol.

2. Existing stations in the following categories, which are operating in primary frequency allotments of the other Administration, shall cease transmissions on or before January 1, 2008:

a. Stations at fixed locations that do not meet the pfd limitation set forth in subparagraph 4.a of Article III of this Protocol;


b. Land mobile stations, ship stations and land portable stations that are located in the areas set forth in subparagraphs 4.b and 4.c of Article III of this Protocol; and

c. Portable stations operated in aircraft located in the Sharing Zone defined in paragraph 2 of Article II.

3. Existing stations that are able to assume secondary status as provided in paragraph 1 of this Article shall conform to the provisions of subparagraphs 4.d, 4.e and 4.f of Article III of this Protocol.

ARTICLE V. Special Interference Protection for Critical Receiver Stations

1. The critical receiver stations within the 406.1-420 MHz band specifically identified in Appendix I shall be afforded special interference protection from harmful interference notwithstanding the provisions of Article III and Article IV.

2. Any station within the Sharing Zone that causes harmful interference to a critical receiver station or stations specifically identified in Appendix I shall take all remedial measures necessary to eliminate the harmful interference to the protected station or stations and their referenced parameters.

ARTICLE VI. Relation to Other Agreements

This Protocol forms an integral part of the Agreement and shall be referred to as the Protocol for the 406.1 - 420 MHz band in the Index of Annex I of the Agreement.



ARTICLE VII. Appendices

Appendices I, II and III are an integral part of this Protocol.

ARTICLE VIII. Entry into Force and Termination

This Protocol shall enter into force on the date of signature. It shall remain in force until it is replaced by a new Protocol, or until it is terminated in accordance with Article VII of the Agreement.

IN WITNESS WHEREOF, the respective representatives have signed the present Protocol.

Done at Mexico City this twenty-seventh day of July, 2005, in duplicate, in the English and Spanish languages, both texts being equally authentic.

FOR THE DEPARTMENT OF STATE FOR THE SECRETAR�A DE
OF THE UNITED STATES OF AMERICA COMUNICACIONES Y
TRANSPORTES OF THE
UNITED MEXICAN STATES



/s/ David A. Gross /s/ Mr. Jorge Alvarez Hoth

_______________________________ ______________________________


/s/ Mr. Jorge Arredondo Martinez
______________________________

APPENDIX I

CRITICAL RECEIVER STATIONS IN MEXICO
IN THE 406.1-420 MHz BAND

THAT WILL BE AFFORDED SPECIAL INTERFERENCE PROTECTION

If a scroll bar appears below the following table, swipe the table to move left/right of the dashed line.

No.

Receiver

Station

Name

Receiver

Frequency

in

MHz

Receiver

Emission

Designator

Receiver Geographic

Coordinates

(NAD 83)

Latitude (N)

Longitude (W)

Receiver Antenna

Azimuth Relative to

True North

(N. 000�E.)

(NAD 83)

Receiver

Antenna

Type,

Beamwidth

in

Degrees &

Polarization

"H" or "V"

Receiver

Antenna

Height

Above

Ground

Level

in

Meters

1

Rep.

Cedros

413.9250

3M75F8EJF

25� 32′ 52″

100� 58′ 51″

187� 42′ 05″

Parabolic

14 V

40

2

S.E.

Ramos

Arizpe

Potencia

410.1750

3M75F8EJF

25� 35′ 46″

100� 54′ 45″

232� 03′ 54″

Parabolic

14 V

45

3

Rio

Escondido

413.9250

3M75F8EJF

28� 29′ 30″

100� 41′ 08″

230� 52′ 48″

Yagi

45 H

40.9


If a scroll bar appears below the following table, swipe the table to move left/right of the dashed line.

No.

Theoretical

PFD

Level

of

Desired

Signal

at

Receiver

in dBm

Associated

Transmitter

Station

Name

Associated

Transmitter

Location

Latitude (N)

Longitude (W)

Nominal

Power

(dBW)

Antenna

Gain

(dBd)

Effective

Radiated

Power

ERP

(dBW)

Equivalent

Isotropically

Radiated

Power

EIRP

(dBW)

1

(Cont'd)

-12.8

S.E.

Saltillo

25� 24′ 35″

101� 00′ 05″

10

23

30 *

32.16 *

2

(Cont'd)

-12.8

Rep.

Cedros

25� 32′ 52″

100� 58′ 51″

10

23

30 *

32.16 *

3

(Cont'd)

-36.3

Nava

28� 26′ 00″

100� 46′ 00″

10

12

19 *

21.16 *


* Calculation includes 3 dB loss for transmission line


appendix i (Continued)

CRITICAL RECEIVER STATIONS IN THE UNITED STATES IN THE 406.1-420 MHz BAND THAT WILL BE AFFORDED SPECIAL INTERFERENCE PROTECTION

If a scroll bar appears below the following table, swipe the table to move left/right of the dashed line.

No.

Receiver

Station

Name

Receiver

Frequency

in

MHz

Receiver

Emission

Designator

Receiver Geographic

Coordinates

(NAD 27)

Latitude (N)

Longitude (W)

Receiver Antenna

Azimuth Relative

to True North

(N.000�E.)

(NAD27)

Receiver Antenna

Type,

Beamwidth

in Degrees &

Polarization

"H" or "V"

Receiver Antenna

Height Above

Ground Level

in

Meters

1

Laguna Dredge

406.1875

11K00F2D--

32� 51′ 19″

114� 28′ 55″

58�

Yagi

60 V

18

2

Telegraph

Pass

406.5000

11K00F3E--

32� 40′ 12″

114� 20′ 06″

228�

Yagi

45 H

6

3

Gila Substation

407.7875

11K00F2D--

32� 41′ 05″

114� 28′ 09″

304�

Yagi

60 V

24

4

Hidden Shores Substation

415.1875

11K00F2D--

32� 52′ 05″

114� 27′ 28″

238�

Yagi

60 V

6

5

San Luis

416.4000

11K00F3E--

32� 29′ 42″

114� 45′ 57″

64�

Yagi

45 H

6

6

Siphon Drop

416.7875

11K00F2D--

32� 46′ 45″

114� 38′ 05″

124�

Yagi

60 V

8

If a scroll bar appears below the following table, swipe the table to move left/right of the dashed line.

No.

Theoretical

PFD Level

of Desired Signal

at Receiver

in

dBm

Associated

Transmitter

Station

Name

Associated

Transmitter

Location

Latitude (N)

Longitude (W)

Nominal

Power

(dBW)

Antenna

Gain

(dBd)

Effective

Radiated

Power

ERP

(dBW)

Equivalent

Isotropically

Radiated

Power

EIRP

(dBW)

1

(Cont'd)

-44.6

Hidden Shores Substation

32� 52′ 05″

114� 27′ 28″

7

6

13

15.15

2

(Cont'd)

-57

Sonora Substation

32� 28′ 48″

114� 35′ 14″

7

10

17

19.15

3

(Cont'd)

-60

Siphon Drop

32� 46′ 45″

114� 38′ 05″

7

6

13

15.15

4

(Cont'd)

-45

Laguna Dredge

32� 51′ 19″

114� 28′ 55″

7

6

13

15.15

5

(Cont'd)

-58

Telegraph

Pass

32� 40′ 12″

114� 20′ 06″

7

10

17

19.15

6

(Cont'd)

-61

Gila Substation

32� 41′ 05″

114� 28′ 09″

7

6

13

15.15



APPENDIX II


Areas Within Which the Frequencies Are to Be Protected

Areas Within Which the Frequencies Are to Be Protected

U.S.-MEXICO SHARING ZONE

The Sharing Zone is defined as the areas covered by a distance of 145 kilometers (90.1 miles) from the
U.S.-Mexico common border into the national territory of each country and includes areas of the Pacific Ocean and
the Gulf of Mexico.

These areas are enclosed by the boundaries shown on the map to the right and are further defined in Table II.


Table II


The following geographic coordinates define the U.S.-Mexico Sharing Zone in the national territory of each country. Point 1 is located in the Pacific Ocean due west from the U.S.-Mexico common border and is the starting point in defining the Sharing Zone. The boundary of the Sharing Zone is then defined by plotting each geographic point in advancing numerical order in a clockwise direction. Each distance path between consecutive points is traversed by great circle arc.

If a scroll bar appears below the following table, swipe the table to move left/right of the dashed line.

No.

Degrees/Minutes/Seconds

Decimal Degrees

1

320 14'16"N 118037'09"W

32.3772N 118.6192W

2

33044'18"N 119058'13"W

33.7384N 119.9704W

3

34000'16"N 114028'01"W

34.0044N 114.4670W

4

32037'24"N 110051'01"W

32.6234N 110.8505W

5

32038'60"N 109018'02"W

32.6500N 109.3006W

6

33005'47"N 108015'42"W

33.0965N 108.2617W

7

33001'27"N 106006'30"W

33.0242N 106.1083W

8

32046'33"N 105030'38"W

32.7757N 105.5105W

9

31021'30"N 103055'51"W

31.3584N 103.9309W

10

30039'31"N 103034'01"W

30.6587N 103.5670W

11

31011'40"N 102026'12"W

31.1945N 102.4368W

12

31002'47"N 101004'18"W

31.0465N 101.0717W

13

30051'19"N 100036'43"W

30.8553N 100.6120W

14

29054'03"N 099028'55"W

29.9007N 099.4820W

15

27021'20"N 097048'03"W

27.3556N 097.8009W

16

27021'05"N 095042'14"W

27.3516N 095.7038W

17

25058'50"N 095042'22"W

25.9805N 095.7061W

18

24033'14"N 095042'46"W

24.5539N 095.7128W

19

24032'41"N 097048'44"W

24.5448N 097.8122W

20

25015'14"N 099040'56"W

25.2539N 099.6823W

21

25040'42"N 100010'59"W

25.6782N 100.1833W

22

27052'01"N 101035'16"W

27.8669N 101.5877W

23

28029'18"N 101057'45"W

28.4884N 101.9625W

24

27058'15"N 102011'48"W

27.9709N 102.1967W

25

27038'22"N 103016'32"W

27.6394N 103.2755W

26

27054'33"N 103059'11"W

27.9093N 103.9863W

27

28030'31"N 105015'57"W

28.5085N 105.2659W

28

29013'30"N 105045'37"W

29.2249N 105.7604W

29

30019'17"N 106057'15"W

30.3215N 106.9544W

30

30001'37"N 107056'47"W

30.0271N 107.9464W

31

30001'18"N 111015'28"W

30.0216N 111.2579W

32

31014'10"N 115005'28"W

31.2361N 115.0911W

33

31021'26"N 115020'31"W

31.3572N 115.3419W

34

31014'34"N 116021'25"W

31.2427N 116.3570W

35

31008'09"N 117053'38"W

31.1359N 117.8939W



APPENDIX III
Allotment of Frequency Sub-bands in the 406.1-420 MHz Band



Mexico PrimaryU.S. Primary

406.10000 - 408.51875 408.51875 - 410.93125


410.93125 - 413.05000 413.05000 - 415.16875


415.16875 - 417.58125 417.58125 - 420.00000


______________________


� All frequencies in MHz