§ 90.361   Interference from part 15 and Amateur operations.

   Operations authorized under parts 15 and 97 of this chapter may not
   cause harmful interference to LMS systems in the 902-928 MHz band.
   These operations will not be considered to be causing harmful
   interference to a multilateration LMS system operating in one of the
   three EA sub-bands (see § 90.357(a)) if they are non-video links
   operating in accordance with the provisions of parts 15 or 97 of this
   chapter and at least one of the following conditions are met:

   (a) It is a field disturbance sensor operating under § 15.245 of this
   chapter and it is not operating in the 904-909.750 or 919.750-928.000
   MHz sub-bands; or

   (b) It does not employ an outdoor antenna; or

   (c) If it does employ an outdoor antenna, then if:

   (1) The directional gain of the antenna does not exceed 6 dBi, or if
   the directional gain of the antenna exceeds 6 dBi, it reduces its
   transmitter output power below 1 watt by the proportional amount that
   the directional gain of the antenna exceeds 6 dBi; and

   (2) Either:

   (i) The antenna is 5 meters or less in height above ground; or

   (ii) The antenna is more than 5 meters in height above ground but less
   than or equal to 15 meters in height above ground and either:

   (A) Adjusts its transmitter output power below 1 watt by 20 log (h/5)
   dB, where h is the height above ground of the antenna in meters; or

   (B) Is providing the final link for communications of entities eligible
   under subpart B or C of this part, or is providing the final link for
   communications of health care providers that serve rural areas,
   elementary schools, secondary schools or libraries.

   [ 60 FR 15253 , Mar. 23, 1995, as amended at  62 FR 52044 , Oct. 6, 1997]

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