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FCC Part 15 Radio Frequency Devices
Section 15.118

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: 47CFR15.118]
[Page 776-778]
 
                       TITLE 47--TELECOMMUNICATION
 
              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
 
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
 
                    Subpart B_Unintentional Radiators
 
Sec. 15.118  Cable ready consumer electronics equipment.
    (a) All consumer electronics TV receiving equipment marketed in the 
United States as cable ready or cable compatible shall comply with the 
provisions of this section. Consumer electronics TV receiving equipment 
that includes features intended for use with cable service but does not 
fully comply with the provisions of this section are subject to the 
labelling requirements of Sec. 15.19(d). Until such time as generally 
accepted testing standards are developed, paragraphs (c) and (d) of this 
section will apply only to the analog portion of covered consumer 
electronics TV receiving equipment
    (b) Cable ready consumer electronics equipment shall be capable of 
receiving all NTSC or similar video channels on channels 1 through 125 
of the channel allocation plan set forth in CEA-542-B: ``CEA Standard: 
Cable Television Channel Identification Plan,'' (incorporated by 
reference, see Sec. 15.38).
    (c) Cable ready consumer electronics equipment must meet the 
following technical performance requirements. Compliance with these 
requirements shall be determined by performing measurements at the 
unfiltered IF output port. Where appropriate, the Commission will 
consider allowing alternative measurement methods.
    (1) Adjacent channel interference. In the presence of a lower 
adjacent channel CW signal that is 1.5 MHz below the desired visual 
carrier in frequency and 10 dB below the desired visual carrier in 
amplitude, spurious signals within the IF passband shall be attenuated 
at least 55 dB below the visual carrier of the desired signal. The 
desired input signal shall be an NTSC visual carrier modulated with a 10 
IRE flat field with color burst and the aural carrier which is 10 dB 
below the visual carrier should be unmodulated. Measurements are to be 
performed for input signal levels of
[[Page 777]]
 
0 dBmV and +15 dBmV, with the receiver tuned to ten evenly spaced EIA 
IS-132 channels covering the band 54 MHz to 804 MHz.
    (2) Image channel interference. Image channel interference within 
the IF passband shall be attenuated below the visual carrier of the 
desired channel by at least 60 dB from 54 MHz to 714 MHz and 50 dB from 
714 MHz to 804 MHz. The 60 dB standard applies at 714 MHz. In testing 
for compliance with this standard, the desired input signal is to be an 
NTSC signal on which the visual carrier is modulated with a 10 IRE flat 
field with color burst and the aural carrier is unmodulated and 10 dB 
below the visual carrier. The undesired test signal shall be a CW signal 
equal in amplitude to the desired visual carrier and located 90 MHz 
above the visual carrier frequency of the desired channel. Measurements 
shall be performed for input signals of 0 dBmV and +15 dBmV, with the 
receiver tuned to at least ten evenly spaced EIA IS-132 channels 
covering the band 54 MHz to 804 MHz.
    (3) Direct pickup interference. The direct pickup (DPU) of a co-
channel interfering ambient field by a cable ready device shall not 
exceed the following criteria. The ratio of the desired to undesired 
signal levels at the IF passband on each channel shall be at least 45 
dB. The average ratio over the six channels shall be at least 50 dB. The 
desired input signal shall be an NTSC signal having a visual carrier 
level of 0 dBmV. The visual carrier is modulated with a 10 IRE flat 
field with color burst, visual to aural carrier ratio of 10 dB, aural 
carrier unmodulated. The equipment under test (EUT) shall be placed on a 
rotatable table that is one meter in height. Any excess length of the 
power cord and other connecting leads shall be coiled on the floor under 
the table. The EUT shall be immersed in a horizontally polarized uniform 
CW field of 100 mV/m at a frequency 2.55 MHz above the visual carrier of 
the EUT tuned channel. Measurements shall be made with the EUT tuned to 
six EIA IS-132 channels, two each in the low VHF, high VHF and UHF 
broadcast bands. On each channel, the levels at the IF passband due to 
the desired and interfering signals are to be measured.
    (4) Tuner overload. Spurious signals within the IF passband shall be 
attenuated at least 55 dB below the visual carrier of the desired 
channel using a comb-like spectrum input with each visual carrier signal 
individually set at +15 dBmV from 54 to 550 MHz. The desired input 
signal is to be an NTSC signal on which the visual carrier is modulated 
with a 10 IRE flat field with color burst and the aural carrier is 
unmodulated and 10 dB below the visual carrier. Measurements shall be 
made with the receiver tuned to at least seven evenly spaced EIA IS-132 
channels covering the band 54 MHz to 550 MHz. In addition, spurious 
signals within the IF passband shall be attenuated at least 51 dB below 
the visual carrier of the desired channel using a comb spectrum input 
with each signal individually set at +15 dBmV from 550 to 804 MHz. 
Measurements shall be made with the receiver tuned to at least three 
evenly spaced EIA IS-132 channels covering the band 550 MHz to 804 MHz.
    (5) Cable input conducted emissions. (i) Conducted spurious 
emissions that appear at the cable input to the device must meet the 
following criteria. The input shall be an NTSC video carrier modulated 
with a 10 IRE flat field with color burst at a level of 0 dBmV and with 
a visual to aural ratio of 10 dB. The aural carrier shall be 
unmodulated. The peak level of the spurious signals will be measured 
using a spectrum analyzer connected by a directional coupler to the 
cable input of the equipment under test. Spurious signal levels must not 
exceed the limits in the following table:
From 54 MHz up to and including 300 MHz-26 dBmV
From 300 MHz up to and including 450 MHz-20 dBmV
From 450 MHz up to and including 804 MHz-15 dBmV
    (ii) The average of the measurements on multiple channels from 450 
MHz up to and including 804 MHz shall be no greater than -20 dBmV. 
Measurements shall be made with the receiver tuned to at least four EIA 
IS-132 channels in each of the above bands. The test channels are to be 
evenly distributed across
[[Page 778]]
each of the bands. Measurements for conducted emissions caused by 
sources internal to the device are to be made in a shielded room. 
Measurements for conducted emissions caused by external signal sources 
shall be made in an ambient RF field whose field strength is 100 mV/m, 
following the same test conditions as described in paragraph (c)(3) of 
this section.
    (d) The field strength of radiated emissions from cable ready 
consumer electronics equipment shall not exceed the limits in Sec. 
15.109(a) when measured in accordance with the applicable procedures 
specified in Sec. Sec. 15.31 and 15.35 for unintentional radiators, 
with the following modifications. During testing the NTSC input signal 
level is to be +15 dBmV, with a visual to aural ratio of 10 dB. The 
visual carrier is to be modulated by a 10 IRE flat field with color 
burst; the aural carrier is to be unmodulated. Measurements are to be 
taken on six EIA IS-132 channels evenly spaced across the required RF 
input range of the equipment under test.
    Note: The provisions of paragraphs (a) through (d) of this section 
are applicable as of June 30, 1997.
[59 FR 25341, May 16, 1994, as amended at 61 FR 18509, Apr. 26, 1996; 65 
FR 64391, Oct. 27, 2000; 68 FR 68546, Dec. 9, 2003; 69 FR 2849, Jan. 21, 
2004; 69 FR 57861, Sept. 28, 2004]



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