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call, due to busy radio circuit conditions combined duration shall not exceed one during each hour; or, for systems that second. Use of tone modulation for sedo not provide message relay service, the lective signaling to and from subscriber total number of minutes that the channel radio installations is not required; how(base and mobile) was utilized for trans- ever, when tone modulation is used for missions between the base station and this purpose, the aforementioned limitaland mobile units during each hour. tion on the combined duration of tones (30 F.R. 2448, Feb. 25, 1965)

is not applicable. Radio installations in

the premises of, or in vehicles of, sub$ 21.517 Use of base station as

scribers are not permitted to be equipped

with code signaling devices (other than On its regularly assigned frequency, for signaling incidental to establishment a base station may be used to

of subscriber communications) whereby perform the added functions of a re- the user would be able to reactivate the peater station when means are provided base station after the radio system has whereby the licensee of the radio system been shut down by the licensee. Appliis able to turn the base station on and cations for authority to operate a con

trol station upon the mobile station off at will from its control point irrespective of the transmissions of sub- frequency shall be supported by complete scriber units on the mobile station fre- engineering information disclosing,

among other things, all particulars of quency associated therewith.

the code signaling system which is to be $ 21.518 Use of mobile station fre

employed. quency for control station.

$ 21.519 Use of mobile station freUpon proper application to the Commission for a construction permit to quency for dispatch stations. install a control station, a base sta- A base station licensee may be aution applicant or licensee may be au- thorized to install, for a mobile station thorized to operate its base station subscriber or a group of mobile station via a control station using the mobile subscribers, a dispatch station using the station frequency

paired

therewith. mobile station frequency paired with the In order to ensure retention of associated base station frequency. Ausential operational control of the ra- thorization for the establishment and dio system by its licensee, it is ex- operation of any dispatch station will Dected that this method of operation will be on the express condition that such not be installed where the signals from station will not cause harmful interfersubscriber operated units are able to ence to the mobile or rural radio sery

ices and will not inhibit use by the override the functions of the control path between the control and base sta- mobile radio service of the frequencies tion, or where such operation will cause

assigned to the dispatch station or deharmful interference to another radio grade the mobile communication service system. The control station shall be rendered by the base station. No disprovided with coded signals whose trans- patch station shall be installed at any mission will enable the control station site or under conditions whereby it will to shut down and reactivate the base sta- be capable of overriding the control tion at will, irrespective of the transmis- functions of a control station using the gons of subscriber units associated same frequency. therewith. Additional coded signals may (a) A licensee may install a dispatch be employed by the control station for

station without authorization for the selective signaling of subscriber units or

specific location if the antenna height for performing essential functions at the

employed at any such location does not base station, e. 8. controlling aero

exceed the criteria set forth in $ 17.3 nautical obstruction marking lights on

of this chapter, the rated power output the base station antenna tower. The

of the transmitter does not exceed 10 orded signals used by control stations for

watts and each such installation otherthut down and reactivation of the base

wise complies with the requirements of station, or for any other essential con

$ $ 21.107, 21.108, 21.110, 21.506, 21.520 ryl functions (other than selective sig

and all other pertinent provisions of

this part. The number of such dispatch Daling incidental to establishment of

station installations shall not exceed the subscriber communications) connected

number stated on the base station license. therewith, shall consist of two or more

The operation of any such installation sequentially transmitted tones whose

shall be subject to termination by the neer in Charge, at least 2 days prior Commission without a hearing upon to the execution of the change. notice to the licensee.

(29 F.R. 11362, Aug. 6, 1964) (b) Any proposal for the installation of a dispatch station which does not Subpart H-Rural Radio Service comply with the limitations and require

& 21.600 Eligibility. ments of paragraph (a) of this section shall be submitted to the Commission,

Authorizations for central office staupon proper application (FCC Form tions and interoffice stations will be is401) for a construction permit.

sued to existing and proposed communi(29 F.R. 11362, Aug. 6, 1964)

cation common carriers. Authorizations

for rural subscriber stations will be is$ 21.520 Notification of operation of sued to communication common carriers

dispatch station without specific au- or to individual users of the service. thorization.

Applications will be granted only in cases (a) The licensee of a base station who where it is shown that (a) the applicant proposes to establish a dispatch station is legally, financially, technically and pursuant to the provisions of $ 21.519(a) otherwise qualified to render the proshall notify the Commission at Wash- posed service, (b) there are frequencies ington, D.C., 20554, and its Engineer in available to enable the applicant to renCharge of the radio district wherein op- der a satisfactory service and (c) the eration is to be conducted, at least 2 public interest, convenience or necessity days prior to the installation of the fa- would be served by a grant thereof. cilities. This notification shall include:

$ 21.601 Frequencies. (1) The name(s) and address(es) of subscriber(s) and the number of mobile

(a) The following frequencies are stations assigned to each subscriber.

available primarily to the Domestic Pub(2) A description of the transmitting

lic Land Mobile Radio Service and, on location, including the geographic co

a secondary basis, to stations in the ordinates to the nearest second of lati

Rural Radio Service, provided no harmtude and longitude, and also by conven

ful interference is caused to stations in tional reference to street number, land

the Domestic Public Land Mobile Radio mark, etc.

Service: (3) The name of the manufacturer, Central office

and model number and rated power output

inter-office sta- Rural subscriber and of transmitter to be installed.

tion frequencies inter-office station (4) The transmitting antenna make,

(MC/s):

frequencies (MC/s) 152.03 2

. 158. 49 model number and power gain in decibels

152.062

• 158. 52 with respect to a reference half-wave di

152.09

? 158. 55 pole antenna.

152.12 )

. 158. 58 (5) The overall height, in feet above 152.15%

158. 61 ground level, of the transmitting an- 152.182

? 158. 64 tenna.

152.21%

158. 67

1 157. 77 (6) The location of the transmitter

152.51 1

* 157. 80 control point.

152.54 1 152.57 1

1 157.83 (7) The exact frequency or frequen

152.601

1 157.86 cies to be used.

152.63 1

1 157.89 (8) The identity and location of the 152.661

1 157.92 base station through which it will com

152.691

1 157.95 municate.

152.72 1

1 157.98 152.75 1

1 158. 01 (9) The commencement date of oper

152.78 1

1 158.04 ation.

152.81 1

1 158. 07 (b) A copy of the foregoing notifica

454.05 2

2 459.05 tion shall be posted with the base station 454.102

. 459. 10 license.

454.15 a

2459. 15 (c) Upon termination of the operation

454.202

2 459. 20 of a dispatch station for which notifica

454.252

. 459. 25 tion was given pursuant to paragraph (a)

454.30

1459. 30 454.35%

: 459.35 of this section or, in the event any of the

454.401

1459.40 facts alleged in such notification will be

454.45 1

1459.45 changed, written notice thereof shall be 454.501

1459. 50 given to the Commission and its Engi- 454.55 1

1459. 55 Mc/s 84.98 85.02 85.06 85.10 85.14 85.18 85.22 85.26 85.30 85.34 85.38 85.42 85.46 85.50 85.54 85.58 85.62 85.66 85.70 85.74 85.78 85.82 85.86 85.90 85.94 85.98 86.02 86.06 86.10 86.14 86.18 86.22 86.26 86.30 86.34 86.38 86.42 86.46 86.50 86.54 86.58 86.62 86.66 86.70 86.74 86.78 86.82 86.86 86.90 86.94 86.98 87.02 87.06 87.10 87.14 87.18 87.22 87.26 87.30 87.34 87.38 87.42 87.46 87.50 87.54 87.58 87.62 87.66 Mc/8 105.46 105.50 105.54 105.58 105.62 105.66 105.70 105.74 105.78 105.82 105.86 105.90 105.94 105.98 106.02 106.06 106.10 106.14 106.18 106.22 106.26 106.30 106.34 106.38 106.42 106.46 106.50 106.54 106.68 106.62 106.66 106.70 106.74 106.78 106.82 106.86 106.90 106.94 106.98 107.02 107.06 107.10 107.14 107.18 107.22 107.26 107.80 107.94 107.38 107.42 107.46 107.50 107.54 107.58 107.62 107.66 107.70 107.74 107.78 107.82 107.86 107.90 107.94 107.98

Central office and

inter-office sta- Rural subscriber and tion frequencies inter-office station

(Mc/s)-Con. frequencies (Mc/8) 454.601_

1459. 60 454.65 1

1459. 65 454.70 12

18 459. 70 454.75 13

18 459. 75 454.80 13

18459. 80 454.85 18

18 459.85 454.9012

18 459.90 454.9513

18459.95 * This frequency is available for assignment only to stations of communications common carriers engaged also in the business of alfording public landline message telephone service.

* This frequency is avallable for assignment only to stations of communication common carriers not also engaged in the business of providing a public landline message telephone service. (NOTE: There is pending, in Docket 13847, a proposal to delete frequencies available for central office and interoffice stations for miscellaneous common car. riers and to retain the frequencies for rural subscribed stations as designated by this footnote designator 2.)

• Pending promulgation of rules and regulations to govern the public air-ground radiotelephone service, and subject to further Order of the Commission, frequencies in the 454.675-455.000 Mc/8 and 459.675-460.000 Mc/s bands are not available for operation of new radio facilities in the Rural Radio Seryice. In the interim, the authorizations of stations using such frequencies may be reneved, subject to Commission determination relative to use of such frequencies by the public afr-ground radiotelephone service.

(b) New stations will not be authorized in the 890-940 Mc/s band. However, stations which were authorized to operate on April 16, 1958, may be granted renewed licenses subject to the following conditions:

(1) Operations shall not be protected against any interference received from the emission of industrial, scientific, and medical equipment operating on 915 MC s or from the emission of radiolocation stations in the 890–942 Mc/s band.

(2) No harmful interference shall be caused to stations operating in the radiolocation service in the 890–942 Mc/s band.

(ci In the State of Hawaii, the followIng frequencies are available for assignment to Inter-Office stations:

76-108 Mc/8 Band Mc/s Mc/8 Mc/s

Mc/s 76.02 76.22

76.42

76.62 76.06 76.26 76.46

76.66 76.10 76.30 76.50 76.70 76 14 76.34 76.54 76.74 76.18 76.38 76.58 76.78

76-108 Mc/s Band-Continued MC/S MC/S Mc/s 76.82 79.54

82.26 76.86 79.58

82.30 76.90 79.62

82.34 76.94 79.66

82.38 76.98 79.70

82.42 77.02 79.74

82.46 77.06 79.78

82.50 77.10

79.82 82.54 77.14 79.86

82.58 77.18 79.90

82.62 77.22 79.94

82.66 77.26 79.98

82.70 77.30 80.02

82.74 77.34 80.06

82.78 77.38 80.10

82.82 77.42 80.14

82.86 77.46 80.18

82.90 77.50 80.22

82.94 77.54 80.26

82.98 77.58 80.30

83.02 77.62 80.34

83.06 77.66 80.38

83.10 77.70 80.42

83.14 77.74 80.46

83.18 77.78 80.50

83.22 77.82 80.54

83.26 77.86 80.58

83.30 77.90 80.62

83.34 77.94 80.66

83.38 77.98 80.70

83.42 78.02 80.74

83.46 78.06 80.78

83.50 78.10 80.82

83.54 78.14 80.86

83.58 78.18 80.90

83.62 78.22 80.94

83.66 78.26 80.98

83.70 78.30 81.02

83.74 78.34 81.06

83.78 78.38 81.10

83.82 78.42 81.14

83.86 78.46 81.18

83.90 78.50 81.22

83.94 78.54 81.26

83.98 78.58 81.30

84.02 78.62 81.34

84.06 78.66 81.38

84.10 78.70 81.42

84.14 78.74 81.46

84.18
78.78
81.50

84.22
78.82
81.54

84.26
78.86
81.58

84.30 78.90 81.62

84.34 78.94 81.66

84.38 78.98 81.70

84.42 79.02 81.74

84.46 79.06 81.78

84.50 79.10 81.82

84.54 79.14 81.86

84.58 79.18 81.90

84.62 79.22 81.94

84.66 79.26 81.98

84.70 79.30 82.02

84.74 79.34 82.06

84.78 79.38 82.10

84.82 79.42 82.14

84.86 79.46 82.18 84.90 79.50 82.22 84.94

76-108 Mc/s Band-Continued Mc/s Mc/s Mc/s 87.70 100.30 102.90 87.74 100.34 102.94 87.78 100.88 102.98 87.82 100.42 103.02 87.86 100.46 103.06 87.90 100.50

103.10 87.94 100.54 103.14 87.98 100.58 103.18 98.02 100.62 103.22 98.06 100.66

103.26 98.10 100.70 103.30 98.14 100.74 103.34 98.18 100.78

103.38 98.22 100.82

103.42 98.26 100.86

103.46 98.90 100.90

103.50 98.34 100.94

103.54 98.38 100.98

103.58 98.42 101.02

103.62 98.48 101.06

103.66 98.50 101.10

103.70 98.54 101.14 103.74 98.58 101.18

103.78 98.62 101.22

103.82 98.66 101.26

103.86 98.70 101.30

103.90 98.74 101.34

103.94 98.78 101.38

103.98 98.82 101.42

104.02 98.86 101.46

104.06 98.90 101.50

104.10 98.94 101.54

104.14 98.98 101.58

104.18 99.02 101.62

104.22 99.06 101.66

104.26 99.10 101.70

104.30 99.14 101.74

104.34 99.18 101.78

104.38 99.22 101.82

104.42 99.26 101.86

104.46 99.30 101.90

104.50 99.34 101.94

104.54 99.38 101.98

104.58 99.42 102.02

104.62 99.46 102.06 104.66 99.50 102.10 104.70 99.54 102.14

104.74 99.58 102.18

104.78 99.62 102.22 104.82 99.66 102.26 104.86 99.70 102.30 104.90 99.74 102.84 104.94 99.78 102.38 104.98 99.82 102.42 105.02 99.86 102.46 105.06 99.90 102.50 105.10 99.94 102.54 105.14 99.98 102.58 105.18 100.02 102.62 105.22 100.06 102.66 105.26 100.10 102.70 105.30 100.14 102.74 105.34 100.18 102.78 105.88 100.22 102.82 105.42 100.28 102.86

and (b) of this section may be assigned, and under the same limitations of shared usage and reservations concerning interference set forth therein, such frequencies may also be assigned to radio relay stations in the Rural Radio Service upon a satisfactory showing as to why it is impracticable to achieve the requisite communication with ut the use of radio relay stations operating on such frequencies.

(e) In Puerto Rico and the Virgin Islands only, the bands 154.04 Mc/s to 154.46 Mc/s and 161.40 Mc/s to 161.85 Mc/s are available for assignment to stations in the Rural Radio Service on a shared basis with stations in the International Fixed Public and Aeronautical Fixed Radio Services. Spacings between assignments in these services are unspecified.

(f) Stations now authorized in the band 890–942 MC/s may be authorized to operate in the band 942–952 Mc/s on the following conditions:

(1) That such stations can show that harmful interference is being caused by Government radiopositioning stations in the 890–942 Mc/s band or by ISM equipment operating on 915 Mc/s.

(2) That an engineering study by the Commission indicates that the proposed frequency assignment in the band 942– 952 Mc/s is likely to eliminate the interference.

(3) That the bandwidth of emission does not exceed 1100 kc/s.

(4) That the proposed frequency assignment will not cause interference to existing operations in the band 942–952 Mc/s. § 21.602 Transmitter power.

Stations in this service shall not be authorized to use transmitters having a rated power output in excess of the limits set forth in $ 21.107(b). A standby transmitter having a rated power output in excess of that of the main transmitter with which it is associated will not be authorized. $ 21.603 Types of emission.

(a) Stations in this service within the continental limits of the United States normally shall be authorized to use only types A1, A2, A3 or F1, F2 and F3 emission for radiotelephony. However, multi-channel type of amplitude or frequency modulated emission for radiotelephony may be authorized upon a satisfactory showing of need therefor and

(d) Within the geographic areas in which the frequencies in paragraphs (a)

provided that the criteria concerning bandwidth of emission set forth in $ 21.604(b) are satisfied.

(b) In addition to the types of emission which may be authorized under the provisions of paragraph (a) of this section, stations in this service outside the continental limits of the United States may be authorized to employ A4 and F4.

(c) The authorization for use of A3 and F3 emission shall be construed to include the use of tone signals or signaling devices whose sole function is to establish and maintain communication between stations.

(d) Other types of emission not described in paragraph (a) of this section

may be authorized upon a satisfactory showing of need therefor. An application requesting such authorization shall fully describe the emission desired, shall indicate the bandwidth required for satisfactory communication, and shall state the purpose for which such emission is required.

(e) Further reference should be made to $ $ 21.103 to 21.105, inclusive. § 21.604 Emission limitations.

The maximum authorized bandwidth of emission and, for the cases of frequency or phase modulated emissions, the maximum authorized frequency deviation shall be as follows:

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(b) Bandwidths of emission greater than shown in paragraph (a) of this section may be authorized for multi-channel operation upon an adequate showing of need therefor and provided a showing is made that the efficiency of frequency utilization per derived communication channel is equivalent to or greater than on a single channel basis. An application requesting such authortzation shall fully describe the modulation, emission and bandwidth desired and shall specify the bandwidth to be occupied $21.605 Modulation requirements.

(a) The use of modulating frequencles higher than 3000 cycles per second for single channel radiotelephony or tone signaling on frequencies below 500 Mc's is not authorized.

(b) When amplitude modulation is used, the modulation percentage shall be suncient to provide efficient communication and shall be normally maintained above 70 percent on peaks, but shall not exceed 100 percent on negative peaks.

(c) When phase or frequency modulation is used for single channel operation on frequencies below 500 Mc/s, the deviation arising from modulation shall

not exceed the limits specified in § 21.604 (a).

(d) Each transmitter, which has more than 3 watts plate power input to the final radio frequency stage and was initially authorized or installed at the station in this service after July 1, 1950, employing type A3 or F3 emission shall be equipped with a device which will automatically prevent greater than normal audio level from modulating in excess of the limits specified in paragraphs (b) and (c) of this section.

(e) Each transmitter, which employs type A3 or F3 emission, shall be equipped with a modulation limiter in accordance with the provisions of paragraph (d) of this section and also shall be equipped with a low-pass audio filter installed between the modulation limiter and the modulated stage. At audio frequencies between 3 kc/s and 15 kc/s, the filter shall have an attenuation greater than the attenuation at 1 kc/s by at least:

40 log10 (1/3) decibels where "f" is the audio frequency in kilocycles. At audio frequencies above 15 kc/s, the attenuation shall be at least 28 decibels greater than the attenuation at 1 kc/s.

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