[Code of Federal Regulations] [Title 47, Volume 1] [Revised as of October 1, 2001] From the U.S. Government Printing Office via GPO Access [CITE: 47CFR15.233] [Page 728-730] TITLE 47--TELECOMMUNICATION CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION PART 15--RADIO FREQUENCY DEVICES--Table of Contents Subpart C--Intentional Radiators Sec. 15.233 Operation within the bands 43.71-44.49 MHz, 46.60-46.98 MHz, 48.75-49.51 MHz and 49.66-50.0 MHz. (a) The provisions shown in this section are restricted to cordless telephones. (b) An intentional radiator used as part of a cordless telephone system shall operate centered on one or more of the following frequency pairs, subject to the following conditions: (1) Frequencies shall be paired as shown below, except that channel pairing for channels one through fifteen may be accomplished by pairing any of the fifteen base transmitter frequencies with any of the fifteen handset transmitter frequencies. (2) Cordless telephones operating on channels one through fifteen must: (i) Incorporate an automatic channel selection mechanism that will prevent establishment of a link on any occupied frequency; and [[Page 729]] (ii) The box or an instruction manual which is included within the box which the individual cordless telephone is to be marketed shall contain information indicating that some cordless telephones operate at frequencies that may cause interference to nearby TVs and VCRs; to minimize or prevent such interference, the base of the cordless telephone should not be placed near or on top of a TV or VCR; and, if interference is experienced, moving the cordless telephone farther away from the TV or VCR will often reduce or eliminate the interference. A statement describing the means and procedures used to achieve automatic channel selection shall be provided in any application for equipment authorization of a cordless telephone operating on channels one through fifteen. ------------------------------------------------------------------------ Base Handset Channel transmitter transmitter (MHz) (MHz) ------------------------------------------------------------------------ 1....................................... 43.720 48.760 2....................................... 43.740 48.840 3....................................... 43.820 48.860 4....................................... 43.840 48.920 5....................................... 43.920 49.020 6....................................... 43.960 49.080 7....................................... 44.120 49.100 8....................................... 44.160 49.160 9....................................... 44.180 49.200 10...................................... 44.200 49.240 11...................................... 44.320 49.280 12...................................... 44.360 49.360 13...................................... 44.400 49.400 14...................................... 44.460 49.460 15...................................... 44.480 49.500 16...................................... 46.610 49.670 17...................................... 46.630 49.845 18...................................... 46.670 49.860 19...................................... 46.710 49.770 20...................................... 46.730 49.875 21...................................... 46.770 49.830 22...................................... 46.830 49.890 23...................................... 46.870 49.930 24...................................... 46.930 49.990 25...................................... 46.970 49.970 ------------------------------------------------------------------------ (c) The field strength of the fundamental emission shall not exceed 10,000 microvolts/meter at 3 meters. The emission limit in this paragraph is based on measurement instrumentation employing an average detector. The provisions in Sec. 15.35 for limiting peak emissions apply. (d) The fundamental emission shall be confined within a 20 kHz band and shall be centered on a carrier frequency shown above, as adjusted by the frequency tolerance of the transmitter at the time testing is performed. Modulation products outside of this 20 kHz band shall be attenuated at least 26 dB below the level of the unmodulated carrier or to the general limits in Sec. 15.209, whichever permits the higher emission levels. Emissions on any frequency more than 20 kHz removed from the center frequency shall consist solely of unwanted emissions and shall not exceed the general radiated emission limits in Sec. 15.209. Tests to determine compliance with these requirements shall be performed using an appropriate input signal as prescribed in Sec. 2.989 of this chapter. (e) All emissions exceeding 20 microvolts/meter at 3 meters are to be reported in the application for certification. (f) If the device provides for the connection of external accessories, including external electrical input signals, the device must be tested with the accessories attached. The emission tests shall be performed with the device and accessories configured in a manner which tends to produce the maximum level of emissions within the range of variations that can be expected under normal operating conditions. (g) The frequency tolerance of the carrier signal shall be maintained within 0.01% of the operating frequency. The tolerance shall be maintained for a temperature variation of -20 degrees C to +50 degrees C at normal supply voltage, and for variation in the primary voltage from 85% to 115% of the rated supply voltage at a temperature of 20 degrees C. For battery operated equipment, the equipment tests shall be performed using a new battery. (h) For cordless telephones that do not comply with Sec. 15.214(d) of this part, the box or other package in which the individual cordless telephone is to be marketed shall carry a statement in a prominent location, visible to the buyer before purchase, which reads as follows: Notice: The base units of some cordless telephones may respond to other nearby units or to radio noise resulting in telephone calls being dialed through this unit without your knowledge and possibly calls being misbilled. In order to protect against such occurrences, this cordless telephone is provided with the following features: (to be completed by the responsible party). [[Page 730]] An application for certification of a cordless telephone shall specify the complete text of the statement that will be carried on the package and indicate where, specifically, it will be located on the carton. [54 FR 17714, Apr. 25, 1989; 54 FR 32340, Aug. 7, 1989, as amended at 56 FR 3785, Jan. 31, 1991; 56 FR 5659, Feb. 12, 1991; 60 FR 21985, May 4, 1995]