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however, This service may not be required when a satisfactory showing has been made that elimination of such seryice will not adversely affect life and property in the air. (31 F.R. 15316, Dec. 7, 1966) $ 87.407 Airdrome facilities.

Only one airdrome control station will be licensed to operate at an airdrome. $ 87.409 Interference.

The operation of airdrome control stations in adjacent airdrome areas shall be on a non-interference basis only. In case of radio interference between adjacent airdrome control stations, the Commission will specify for its licensees, the arrangements necessary to eliminate interference. $ 87.411 Power.

(a) Airdrome control stations using frequencies below 400 kilocycles will not be licensed to use more than 15 watts power for type-A3 emission.

(b) The power of airdrome control stations operating on the frequencies specified in $ 87.401(a) shall not exceed 50 watts. Subpart J-Aeronautical Utility

Mobile Stations SOURCE: The provisions of this Subpart J appear at 28 F.R. 14095, Dec. 21, 1963, unless otherwise noted. $ 87.431 Frequencies available.

The frequencies 121.60, 121.65, 121.70, 121.75, 121.80, 121.85, and 121.90 megacycles are available for use by aeronautical utility mobile stations. The frequency 121.60 MC/S is available to aeronautical utility mobile stations for airport utility communications on the condition that no harmful interference is caused to search and rescue communications during any period of search and rescue operations in the locale involved. [28 F.R. 14095, Dec. 21, 1963, as amended at 33 F.R. 14298, Sept. 21, 1968] 87.433 Scope of service.

Communications by a utility station shall be limited to the necessities of ground traffic control at an airdrome and may be used for essential communications with the control towers, ground vehicles and aircraft on the ground.

$ 87.435 Power.

Power and antenna height shall be restricted to the minimum to achieve the required service. § 87.437 Supervision by airdrome con.

trol operator. At any airdrome at which an airdrome control tower is in operation, transmission by the utility station shall be subject to the control of the airdrome control station and shall be discontinued immediately when so requested by the control station. The utility station shall guard the utility frequency during periods of operation. Subpart K-Aeronautical Search and

Rescue Mobile Stations § 87.441 Frequencies available.

(a) The frequency 123.1 megacycles is available for use by aeronautical search and rescue mobile stations.

NOTE: Prior to Jan. 1, 1969, the primary frequency for aeronautical search and rescue mobile operations is 121.6 Mc/s.

(b) 121.5 megacycles: This is a universal simplex emergency and distress frequency for air-ground communications and will not be assigned unless (1) a showing is made establishing a need for such services and (2) the regular search and rescue mobile frequency is assigned and available for use to accommodate normal communications needs. (31 F.R. 8629, June 22, 1966, as amended at 33 F.R. 14298, Sept. 21, 1968] § 87.443 Scope of service.

Aeronautical search and rescue mobile stations shall be used only for communications with aircraft engaged in search and rescue operations. [28 F.R. 14096, Dec. 21, 1963) Subpart -Aeronautical Fixed

Stations SOURCE: The provisions of this Subpart L appear at 28 F.R. 14096, Dec. 21, 1963, unless otherwise noted. $ 87.451 Eligibility.

Authorization to operate an aeronautical fixed station will be issued only to the licensee of an aeronautical en route station with which the aeronautical fixed station will be associated. Aeronautical fixed station authorizations will not be issued where land line facilities adequate for the service required are available.

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$ 87.453 Scope of service.

(2) The frequency 4845 kes is avail. Aeronautical fized stations shal pro

able for assignment to aeronautical fized vide all necessary non-public point-to

stations in Alaska This frequency point communications service pertaining only be authorized in conjunction wita to safety, regularity and economy of

authorizations for use of the aeronauti. Asghat. Such stations shall transmit, al enroute frequencies specified to toithout discrimination, messages origie $87 297 (a). nated by aircraft radio station licensees Subpart M-Operational Stations who have entered into equitable, cost sharing arrangements governing the op- $87.461 Service zathorized. eration and maintenance of such sta- Operational Stations in the Aviation tions: Prorided, however, That aerona. Services are authorized for link o con. sical fred station licensees are required trol circuits or other aeronautical operto transmit, without charge or discrim- ations. ination all necessary messages in time 130 72 2801, 12. 4, 1985) of piese emergency which involve the safety of me and property.

$ 87.463 Frequencies available to fized

stations 3 87.455 Assignment of frequencies.

Operational Exed stations in the aero(a) United States (excluding Alaska).

nautical fized service will share the free Only those frequencies whicb are in ac- quency bands alocated to operational cordance with $ 2.105 of this chapter fized stations with other services 25 may be authorized fotkse by aeronaut- follows: ca! Szed statons. The appesart stail a) The frequencies tisted in this request specife frequencies in such

paragraph may be assigned under the bards ben nating an applicator for conditions set forth in subparagraphs an aeronauticai fized station. The arzi. *1) through 16" of this paragraph. Sta. abait for assignment of such frequen- tions authorized to operate in the band cies van be determined the Commis. 73-746 We s as of December 1, 1961. Say sion by study of the probabilites of contine to sperate in this band and are interference to and from erosting serv- not required to afiozd protection to the ices assigned so the same or adjacent radio astronomy service) frequencies, and, if necessary. by appropriate coordination with other agen

72.02 72 40 cies. Al des asentaments of frecuencies

72 42 be subject to se conections as may be reçered to remize the possitesty

72.50 of harmii interference to existing

22.54 72.92

72:4 72 62 b. Alake. In the author.zation of frequencies for sase of aeronautica fized

2.18 72.66 75.52 stators in Alaska the 1918 cond

7220 trons, in addition to those in parzgraph 7222 72.70 a) of this section shall apply:

72.72 (1) Except as provided in subparagraph (2) of this paragraph, frequencies

72.28 72276

72.73 will be authorized to aeronautical Seed

75.68 stations in Alaska, only when such stations serre scheduled certificated air ca. riers as defined by the Civil Aeronautics (1) In any area in the continenta Board When Eing applications for Erited States (exeinding Alaska). sich frequencies, the applicant must maximum of four of the frequencies show that the station will provide com- Ested in this paragraph may be signed munications only along the routes served to aeronautical operational fized staby the scheduled operations of such car

tions riers. A copy of the contractual ar- (2) All authorizations are subject to rangements made with each of the air the condition that no harmft' beter carriers to be served must be submitted ference will be caused to television with the application.

ception on Channels 4 and 5.

(3) The applicant agrees to eliminate any harmful interference caused by his operation to TV reception on either Channel 4 or 5 that might develop by whatever means are found necessary within 90 days of the time knowledge of said interference is first brought to his attention by the Commission. If said interference is not cleared up within the 90-day period, operation of the fixed station will be discontinuod.

(4) Vertical polarization is used.

(5) Whenever it is proposed to locate a 72–76 Mc/s fixed station less than 80, but more than 10 miles from the site of a TV transmitter operating on either Channel 4 or 5, or from the post office of a community in which such channels are assigned but are not in operation, the fixed station shall be authorized only if there are fewer than 100 family dwelling units, as defined by the U.S. Bureau of Census, located within a circle centered at the location of the proposed fixed station (family dwelling units 70 or more miles distant from the TV antenna site are not to be counted), the radius of which shall be determined by use of the appropriate chart entitled, "Chart for Determining Radius From Fixed Station in 72–76 Mc/s Band to Interference Contour Along Which 10 Percent of Service From Adjacent Channel Television Station Would Be Destroyed"; two charts are provided, one for Channel 4 and one for Channel 5. The Commission may, however, in a particular case, authorize the location of a fixed station within a circle as determined above containing 100 or more family dwelling units upon a showing that:

(i) The proposed site is the only suitable location.

(ii) It is not feasible, technically or otherwise, to use other available frequencies.

(iii) The applicant has a plan to control any interference that might develop to TV reception from his operations.

(iv) The applicant is financially able and agrees to make such adjustments in the TV receivers affected as may be necessary to eliminate interference caused 'by his operations.

(6) All applications seeking authority to operate with a separation of less than 10 miles will be returned without action.

(b) The frequencies listed in the table in this paragraph may be assigned for operational fixed microwave operation subject to the conditions set forth in paragraph (d) of this section and the limitations contained in the footnotes to the table.

BAND (Mc/s) 952-9601

8400–8500 3 1850-1990

12200-12700 2130-2150

13200–13250 3 2150-2160

17700-19300 : 2180-2200

19400–19700 : 2450–25002

27525–313003 2500-26905

38600-40000 6575-6875 1 Available for assignment in accordance with the frequency pairing plan as contained in paragraph (c) of this section.

2 Subject to no protection from interference due to the operation of industrial, scientific, and medical devices in this band.

3 Limited to developmental operation only with the assigned frequency and particulars of operation specified in each authorization.

* Available on a developmental basis only for omnidirectional operation.

• Operational fixed stations in this band must utilize transmitting equipment which meets the technical requirements for Instructional Television Fixed Stations as contained in Part 74 of this chapter.

(c) The frequencies between 952 and 960 MC/s will be assigned as follows:

Paired frequencies (MC/S) 959.9-956.3 1

958.1-954.5 959.8—956.21

958.0—954.4 959.7--956.1

957.9--954.3 959.6-956.0

957.8-954.2 959.5-955.9

957.7-954.1 959.4955.8

957.6–954.0 959.3-955.7

957.5—953.9 959.2—955.6

957.4953.8 959.1—955.5

957.3—953.7 959.04-955.4

957.2-953.6 958.9- -955.3

957.1-953.5 958.8-955.2

957.0—953.4 958.7-955.1

956.9-953.3 958.6-955.0

956.8953.2 958.5—954.9

956.7—953.1 958.4954.8

956.6—953.0 958.3—954.7

956.5—952.9 1 958.2—954.6

956.4–952.81 Unpaired frequencies (Mc/8) 952.419 952.3 13 952.2 13 952.1 13

1 Available on developmental basis only for omni-directional operation, and for other than the control of traffic signals.

* The maximum rated power output of transmitters for omni-directional operations authorized to operate on this frequency is 100 watts.

FOR

CHANNEL

4

OMART FOR DETERMINING RADIUS FROM FIXED STATION IN 72. Ya M. BAND TO INTERFERENCE CONTOUR ALONG WHION 10X OF SERVICE FROM ADJACENT TELEVISION STATION WOULO BE DESTROYED

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FOR

CHANNEL

5

CHART FOR DETERMINING RADIUS FROM FIXED STATION IN
72 - 76 Mc/ BAND TO INTERFERENCE CONTOUR ALONG WHICH 10% OF
SERVICE FROM ADJACENT TELEVISION STATION WOULD BE DESTROYED

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1,000

600
600
300
100
300

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- 50

-60

hheight in feet of the center of the transmitting antenna array of

the fixed 72-76 Me/s station with respect to the average level of the terrain between 2 and 10 miles from such antenna in the direction of the TV station. (The method for determining this height is explained in detail in the TV Broadcast Rules.)

200
130
100
do

70
00
90
100

Haight of Fixed Station Antenna

Power of Fixed Station (Waris)

S - separation in miles between the television station antenna and

the 72-76 Mc/s fixed station antenna.

150

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r - distance in miles from the 72-76 Mc/s fixed station antenna to

the, contour at which the TV service area is reduced by 10%.
This distance is measured from the 72-76 Mc/s antenna in the
direction of the TV antenna.

200

IS

1 - frequency in Mc/s of 72-76 Mc/s fixed stations. NOTE: frequencies included in cross hatched area are not

available for assignment,

300

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