Custom Search
Over 10000 Pages Indexed
Your Host
Click here to read about RF CafeKirt
Blattenberger

... single-
handedly
redefining
what an
engineering website
should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

FCC Part 15 Radio Frequency Devices
Section 15.233

The Federal Communications Commission (FCC) is the authority in the United States of America that creates and enforces the use of airwaves throughout the entire radio frequency spectrum. This group of documents contains the entirety of the FCC Part 15 regulations that concern unlicensed radio frequency devices. As with all government documents, this material is in the public domain and may be freely copied so long as the content is not changed. This copy is provided as a convenience for RF Cafe visitors. 

Click here for the Table of Contents.
[Code of Federal Regulations]
[Title 47, Volume 1]
[Revised as of October 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR15.233]
[Page 813-814]
 
                       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
    (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
[[Page 814]]
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]



A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel