Sec. 22.352  Protection from interference.

    Public Mobile Service stations operating in accordance with FCC 
rules that provide technical channel assignment criteria for the radio 
service and channels involved, all other applicable FCC rules, and the 
terms and conditions of their authorizations are normally considered to 
be non-interfering. If the FCC determines, however, that interference 
that significantly interrupts or degrades a radio service is being 
caused, it may, in accordance with the provisions of sections 303(f) and 
316 of the Communications Act of 1934, as amended, (47 U.S.C. 303(f), 
316), require modifications to any Public Mobile station as necessary to 
eliminate such interference.
    (a) Failure to operate as authorized. Any licensee causing 
interference to the service of other stations by failing to operate its 
station in full accordance with its authorization and applicable FCC 
rules shall discontinue all transmissions, except those necessary for 
the immediate safety of life or property, until it can bring its station 
into full compliance with the authorization and rules.
    (b) Intermodulation interference. Licensees should attempt to 
resolve such interference by technical means.
    (c) Situations in which no protection is afforded. Except as 
provided elsewhere in this part, no protection from interference is 
afforded in the following situations:
    (1) Interference to base receivers from base or fixed transmitters. 
Licensees should attempt to resolve such interference by technical means 
or operating arrangements.
    (2) Inteference to mobile receivers from mobile transmitters. No 
protection is provided against mobile-to-mobile interference.
    (3) Interference to base receivers from mobile transmitters. No 
protection is provided against mobile-to-base interference.
    (4) Interference to fixed stations. Licensees should attempt to 
resolve such interference by technical means or operating arrangements.

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    (5) Anomalous or infrequent propagation modes. No protection is 
provided against interference caused by tropospheric and ionospheric 
propagation of signals.
    (6) Facilities for which the FCC not notified. No protection is 
provided against interference to the service of any additional or 
modified transmitter operating pursuant to Sec. 22.163 or Sec. 22.165, 
unless and until the licensee notifies the FCC (FCC Form 489) of the 
additional or modified transmitter.
    (7) In-building radiation systems. No protection is provided against 
interference to the service of in-building radiation systems (see 
Sec. 22.383).
[59 1997 FR 59507 , Nov. 17, 1994, as amended at  62 FR 11633 , Mar. 12, 1997]