47 C.F.R. § 95.639 Maximum transmitter power.
Title 47 - Telecommunication
(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 §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 §§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]
Title 47: Telecommunication
PART 95—PERSONAL RADIO SERVICES
Subpart E—Technical Regulations
Technical Standards
§ 95.639 Maximum transmitter power.
