Goto Section: 15.231 | 15.235 | Table of Contents
FCC 15.233
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 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.
Channel Base transmitter (MHz) Handset transmitter (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 § 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
§ 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 § 15.209. Tests to determine compliance with these
requirements shall be performed using an appropriate input signal as
prescribed in § 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 § 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]
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Goto Section: 15.231 | 15.235
Goto Year: 2014 |
2016
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