§  90.723   Selection and assignment of frequencies.

   (a) Phase II applications for frequencies in the 220-222 MHz band shall
   specify whether their intended use is for 10-channel nationwide
   systems, 10-channel EA systems, 15-channel Regional systems, public
   safety/mutual aid use, or emergency medical use. Phase II applicants
   for frequencies for public safety/mutual aid use or emergency medical
   use shall specify the number of frequencies requested. All frequencies
   in this band will be assigned by the Commission.

   (b) Phase II channels will be assigned pursuant to § §  90.717, 90.719,
   90.720, 90.721, 90.761 and 90.763.

   (c) Phase II applicants for public safety/mutual aid and emergency
   medical channels will be assigned only the number of channels justified
   to meet their requirements.

   (d) Phase I base or fixed station receivers utilizing 221-222 MHz
   frequencies assigned from Sub-band A as designated in §  90.715(b) will
   be geographically separated from those Phase I base or fixed station
   transmitters utilizing 220-221 MHz frequencies removed 200 kHz or less
   and assigned from Sub-band B as follows:

   Geographic Separation of Sub-Band A; Base or Fixed Station Receivers
   and Sub-Band B; Base or Fixed Station Transmitters Effective
   Separation distance (kilometers) Radiated power (watts) ^1
   0.0-0.3                                               (^2)
   0.3-0.5                                                  5
   0.5-0.6                                                 10
   0.6-0.8                                                 20
   0.8-2.0                                                 25
   2.0-4.0                                                 50
   4.0-5.0                                                100
   5.0-6.0                                                200
   Over 6.0                                               500

   ^1 Transmitter peak envelope power shall be used to determine effective
   radiated power.

   ^2 Stations separated by 0.3 km or less shall not be authorized. This
   table does not apply to the low-power channels 196-200. See
   §  90.729(c).

   (e) Phase II licensees authorized on 220-221 MHz frequencies assigned
   from Sub-band B will be required to geographically separate their base
   station or fixed station transmitters from the base station or fixed
   station receivers of Phase I licensees authorized on 221-222 MHz
   frequencies 200 kHz removed or less in Sub-band A in accordance with
   the Table in paragraph (d) of this section. Such Phase II licensees
   will not be required to geographically separate their base station or
   fixed station transmitters from receivers associated with additional
   transmitter sites that are added by such Phase I licensees in
   accordance with the provisions of §  90.745(a).

   (f) Phase II licensees with base or fixed stations transmitting on
   220-221 MHz frequencies assigned from Sub-band B and Phase II licensees
   with base or fixed stations receiving on Sub-band A 221-222 MHz
   frequencies, if such transmitting and receiving frequencies are 200 kHz
   or less removed from one another, will be required to coordinate the
   location of their base stations or fixed stations to avoid interference
   and to cooperate to resolve any instances of interference in accordance
   with the provisions of §  90.173(b).

   (g) Phase I licensees with base or fixed stations transmitting on
   220-221 MHz frequencies assigned from Sub-band B and Phase I licensees
   with base or fixed stations receiving on Sub-band A 221-222 MHz
   frequencies (if such transmitting and receiving frequencies are 200 kHz
   or less removed from one another) that add, remove, or modify station
   sites in accordance with the provisions of §  90.745(a) will be
   required to coordinate such actions with one another to avoid
   interference and to cooperate to resolve any instances of interference
   in accordance with the provisions of §  90.173(b).

   (h) Phase I licensees with base or fixed stations transmitting on
   220-221 MHz frequencies assigned from Sub-band B that add, remove, or
   modify station sites in accordance with the provisions of §  90.745(a)
   will be required to coordinate such actions with Phase II licensees
   with base or fixed stations receiving on Sub-band A 221-222 MHz
   frequencies 200 kHz or less removed.

   (i) A mobile station is authorized to transmit on any frequency
   assigned to its associated base station. Mobile units not associated
   with base stations ( see §  90.720(a)) must operate on "mobile"
   channels.

   (j) A licensee's fixed station is authorized to transmit on any of the
   licensee's assigned base station frequencies or mobile station
   frequencies.

   (k) Except for nationwide assignments, the separation of co-channel
   Phase I base stations, or fixed stations transmitting on base station
   frequencies, shall be 120 kilometers. Except for Phase I licensees
   seeking license modification in accordance with the provisions of
   § §  90.751 and 90.753, shorter separations between such stations will
   be considered by the Commission on a case-by-case basis upon submission
   of a technical analysis indicating that at least 10 dB protection will
   be provided to an existing Phase I station's predicted 38 dBu signal
   level contour. The existing Phase I station's predicted 38 dBu signal
   level contour shall be calculated using the F(50,50) field strength
   chart for Channels 7-13 in §  73.699 (Fig. 10) of this chapter, with a
   9 dB correction factor for antenna height differential. The 10 dB
   protection to the existing Phase I station's predicted 38 dBu signal
   level contour shall be calculated using the F(50,10) field strength
   chart for Channels 7-13 in §  73.699 (Fig. 10a) of this chapter, with a
   9 dB correction factor for antenna height differential.

   [ 62 FR 15995 , Apr. 3, 1997, as amended at  62 FR 18936 , Apr. 17, 1997;
    63 FR 32590 , June 12, 1998]

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