Goto Section: 90.721 | 90.725 | Table of Contents
FCC 90.723
Revised as of October 1, 2008
Goto Year:2007 |
2009
Sec. 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 Sec. Sec. 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 Sec. 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 Sec. 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 Sec. 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 Sec. 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 Sec. 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 Sec. 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 Sec. 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 Sec. 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 Sec. Sec. 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 Sec. 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 Sec. 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: 2007 |
2009
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