Goto Section: 15.231 | 15.235 | Table of Contents
FCC 15.233
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 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]
Goto Section: 15.231 | 15.235
Goto Year: 2010 |
2012
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