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

   (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).

   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]