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]