§ 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]

   return arrow Back to Top