[Code of Federal Regulations]
[Title 47, Volume 1]
[Revised as of October 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR15.118]
[Page 695-697]
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
[[Page 696]]
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 the Electronics Industries
Association's ``Cable Television Channel Identification Plan, EIA IS-
132, May 1994'' (EIA IS-132). This incorporation by reference was
approved by the Director of the Federal Register in accordance with 5
U.S.C. 522(a) and 1 CFR part 51. Copies of EIA IS-132 may be obtained
from: Global Engineering Documents, 3130 South Harbor Boulevard, Santa
Anna, CA 92704. Copies of EIA IS-132 may be inspected during normal
business hours at the following locations: Federal Communications
Commission, 1919 M Street, NW., Dockets Branch (Room 239), Washington,
DC, or the Office of the Federal Register, 800 North Capitol Street,
NW., suite 700, Washington, DC.
(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 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
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+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 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 Secs. 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]
Effective Date Note: At 65 FR 64391, Oct. 27, 2000, Sec. 15.118 was
amended by adding a new sentence at the end of paragraph (a). This
section contains information collection and recordkeeping requirements
and will not become effective until approval has been given by the
Office of Management and Budget.