Goto Section: 90.721 | 90.725 | Table of Contents
FCC 90.723
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 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
^1Transmitter peak envelope power shall be used to determine effective
radiated power.
^2Stations 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]
Goto Section: 90.721 | 90.725
Goto Year: 2010 |
2012
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