Sec.  95.639   Maximum transmitter power.

   (a) No GMRS transmitter, under any condition of modulation, shall exceed:

   (1) 50 W Carrier power (average TP during one unmodulated RF cycle) when
   transmitting emission type A1D, F1D, G1D, A3E, F3E or G3E.

   (2) 50 W peak envelope TP when transmitting emission type H1D, J1D, R1D,
   H3E, J3E or R3E.

   (b) No R/C transmitter, under any condition of modulation, shall exceed a
   carrier power or peak envelope TP (single-sideband only) of:

   (1) 4 W in the 26–27 MHz frequency band, except on channel frequency 27.255
   MHz;

   (2) 25 W on channel frequency 27.255 MHz;

   (3) 0.75 W in the 72–76 MHz frequency band.

   (c) No CB transmitter, under any condition of modulation, shall exceed:

   (1) 4 W Carrier power when transmitting emission type A1D or A3E;

   (2) 12 W peak envelope TP when transmitting emission type H1D, J1D, R1D,
   H3E, J3E or R3E. Each CB transmitter which transmits emission type H3E, J3E
   or R3E must automatically prevent the TP from exceeding 12 W peak envelope
   TP or the manufacturer's rated peak envelope TP, whichever is less.

   (d) No FRS unit, under any condition of modulation, shall exceed 0.500 W
   effective radiated power (ERP).

   (e) The maximum transmitter output power authorized for LPRS stations is 100
   mW.

   (f) In the MICS the following limits apply:

   (1) The maximum EIRP for MICS transmitter stations is 25 microwatts. The
   antenna associated with any MICS transmitter must be supplied with the
   transmitter and shall be considered part of the transmitter subject to
   equipment authorization. Compliance of any MICS transmitter with the 25
   microwatts EIRP limit may be determined by measuring the radiated field from
   the equipment under test at 3 meters and calculating the EIRP. The
   equivalent radiated field strength at 3 meters for 25 microwatts EIRP is
   18.2 mV/meter when measured on an open area test site, or 9.1 mV/meter when
   measured on a test site equivalent to free space such as a fully anechoic
   test chamber. In either case, compliance is based on measurements using a
   peak detector function and measured over an interval of time when
   transmission is continuous and at its maximum power level. In lieu of using
   a peak detector function, instrumentation techniques set forth in ANSI
   C63.17–1998, Section 6.1.2.2.1 or Section 6.1.2.2.2 may be used in
   determining compliance with the above specifications.

   (2) For a transmitter intended to be implanted in a human body, the
   following test fixture must be used to simulate operation of the implant
   under actual operating conditions. See  Sec. 95.605.

   (i) For measurement purposes to determine compliance with emission limits,
   the radiating characteristics of an implant transmitter placed in a test
   fixture should approximate those of an implant transmitter placed in a human
   body. An appropriate human torso simulator for testing medical implant
   transmitters consists of a cylindrical Plexiglas container with a size of 30
   cm by 76 cm with a sidewall thickness of 0.635 cm. It must be completely
   filled with a material that is sufficiently fluidic that it will flow around
   the implant without any voids. The dielectric and conductivity properties of
   this material must match the dielectric and conductivity properties of human
   muscle tissue at 403.5 MHz. All emissions measurements will be made using
   the above specification at a nominal temperature of 20–25 °C. Simple saline
   solutions do not meet the above criteria. A mounting grid for the implant
   inside the container must be provided that permits the radiating element or
   elements of the implant to be positioned vertically and horizontally. The
   grid should also support any additional implant leads associated with the
   therapeutic function in a fixed repeatable manner. The implant must be
   mounted 6 cm from the sidewall and centered vertically within the container.
   The above fixture shall be placed on a turntable such that the implant
   transmitter will be located at a nominal 1.5-meter height above ground and
   at a 3-meter distance from the measurement antenna. Radiated emissions
   measurements shall then be performed to insure compliance with the
   applicable technical specifications.

   (ii) A formula for a suitable tissue substitute material is defined in the
   paper “Simulated Biological Materials for Electromagnetic Radiation
   Absorption Studies” by G. Hartsgrove, A. Kraszewski, and A. Surowiec as
   published in “Bioelectromagnetics 8:29–36 (1987)”.

   (3) The power radiated in any 300 kHz bandwidth shall not exceed 25
   microwatts EIRP. See  Sec.  Sec. 95.633(e) and 95.639(g).

   (g) The maximum field strength authorized for WMTS stations in the 608–614
   MHz band is 200 mV/m, measured at 3 meters. For stations in the 1395–1400
   MHz and 1427–1429.5 MHz bands, the maximum field strength is 740 mV/m,
   measured at 3 meters.

   (h) No MURS unit, under any condition of modulation, shall exceed 2 Watts
   transmitter power output.

   (i) DSRCS-OBUs are governed under subpart L of this part, except the maximum
   output power for portable DSRCS-OBUs is 1.0 mW. For purposes of this
   paragraph, a portable is a transmitting device designed to be used so that
   the radiating structure(s) of the device is/are within 20 centimeters of the
   body of the user.

   [ 53 FR 36789 , Sept. 22, 1988;  53 FR 44144 , Nov. 1, 1988. Redesignated and
   amended at  61 FR 28769 , 28770, June 6, 1996, and further redesignated and
   amended at  61 FR 46567 , 46569, Sept. 4, 1996;  64 FR 69932 , Dec. 15, 1999;  65 FR 44008 , July 17, 2000;  65 FR 53190 , Sept. 1, 2000;  65 FR 60878 , Oct. 13,
   2000;  67 FR 6193 , Feb. 11, 2002;  67 FR 8579 , Feb. 25, 2002;  67 FR 63290 ,
   Oct. 11, 2002;  69 FR 46446 , Aug. 3, 2004]

Certification Requirements