Sec. 90.249  Control stations.

    Control stations associated with land mobile stations under this 
part shall be authorized to operate subject to the following:
    (a) Frequencies for control stations. (1) Control stations may be 
authorized to operate on frequencies available for use by operational 
fixed stations.
    (2) A control station associated with mobile relay station(s) may, 
at the option of the applicant, be assigned the frequency of the 
associated mobile station. In the Industrial/Business Pool, on 
frequencies designated with an ``LR'' in the coordinator column of the 
frequency table in Sec. 90.35(b)(3), such a control station may be 
assigned any mobile service station frequency available for assignment 
to mobile stations. Such operation is on a secondary basis to use of the 
frequency for regular mobile service communications.
    (3) Control and fixed stations in the Public Safety Pool may be 
authorized on a temporary basis to operate on frequencies available for 
base and mobile stations between 152 and 450 MHz, where there is an 
adequate showing that such operations cannot be conducted on frequencies 
allocated for assignment to operational fixed stations. Such operation 
will not be authorized initially or renewed for periods in excess of one 
year. Any such authorization shall be subject to immediate termination 
if harmful interference is

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caused to stations in the mobile service, or if the particular frequency 
is required for mobile service operations in the area concerned.
    (b) [Reserved]
    (c) A base station which is used intermittently as a control station 
for one or more associated mobile relay stations of the same licensee 
shall operate only on the mobile service frequency assigned to the 
associated mobile relay station when operating as a base station and on 
the mobile service frequency assigned to the associated mobile station 
when operating as a control station. Authority for such dual 
classification and use must be shown on the station authorization. When 
operating as a control station, the licensee must meet all control 
station requirements. In the Industrial/Business Pool, on frequencies 
designated with an ``LR'' in the coordinator column of the frequency 
table in Sec. 90.35(b)(3), base stations used intermittently as control 
stations shall operate only on a mobile service frequency which is 
available for assignment to base stations.
[ 43 FR 54791 , Nov. 22, 1978, as amended at  49 FR 36376 , Sept. 17, 1984; 
 62 FR 18928 , Apr. 17, 1997]

    Effective Date Note: At  62 FR 18928 , Apr. 17, 1997, Sec. 90.249 was 
amended by revising the second sentence of paragraph (a)(2), the first 
sentence of paragraph (a)(3), and the last sentence of paragraph (c), 
effective Oct. 17, 1997.