Sec.  15.319   General technical requirements.

   (a) [Reserved]

   (b) All transmissions must use only digital modulation techniques.

   (c) Peak transmit power shall not exceed 100 microwatts multiplied by the
   square root of the emission bandwidth in hertz. Peak transmit power must be
   measured over any interval of continuous transmission using instrumentation
   calibrated in terms of an rms-equivalent voltage. The measurement results
   shall be properly adjusted for any instrument limitations, such as detector
   response times, limited resolution bandwidth capability when compared to the
   emission bandwidth, sensitivity, etc., so as to obtain a true peak
   measurement for the emission in question over the full bandwidth of the
   channel.

   (d) Power spectral density shall not exceed 3 milliwatts in any 3 kHz
   bandwidth as measured with a spectrum analyzer having a resolution bandwidth
   of 3 kHz.

   (e) The peak transmit power shall be reduced by the amount in decibels that
   the maximum directional gain of the antenna exceeds 3 dBi.

   (f) The device shall automatically discontinue transmission in case of
   either absence of information to transmit or operational failure. The
   provisions in this section are not intended to preclude transmission of
   control and signaling information or use of repetitive codes used by certain
   digital technologies to complete frame or burst intervals.

   (g) Notwithstanding other technical requirements specified in this subpart,
   attenuation of emissions below the general emission limits in  Sec. 15.209 is not
   required.

   (h) Where there is a transition between limits, the tighter limit shall
   apply at the transition point.

   (i) Unlicensed PCS devices are subject to the radiofrequency radiation
   exposure requirements specified in  Sec.  Sec. 1.1307(b), 2.1091 and 2.1093 of this
   chapter, as appropriate. All equipment shall be considered to operate in a
   “general population/uncontrolled” environment. Applications for equipment
   authorization of devices operating under this section must contain a
   statement confirming compliance with these requirements for both fundamental
   emissions and unwanted emissions. Technical information showing the basis
   for this statement must be submitted to the Commission upon request.

   [ 58 FR 59180 , Nov. 8, 1993, as amended at  59 FR 32852 , June 24, 1994;  59 FR 40835 , Aug. 10, 1994;  60 FR 13073 , Mar. 10, 1995;  61 FR 41018 , Aug. 7, 1996;
    69 FR 62621 , Oct. 27, 2004;  69 FR 77949 , Dec. 29, 2004]