Interpretations processed by ANSC-C63®

Interpretations and Explanations Processed by C63^®

(Revision date: 13 Oct 2025)

The Interpretations below have been processed by ANSC-C63^® per its operating procedures, as outlined in Clause 11. Requests for Interpretations must be directed to the Secretary of ANSC-C63^®. Remaining questions about the processing of Interpretation Requests should be directed to the ANSC-C63^® Secretariat; which is the IEEE, Jennifer Santulli. Contact information for the ANSC-C63^® leadership is available at http://www.c63.org/documents/rosters_public/c63_officers_list.htm.

Standard	Type	Date	SC	Description

C63.2-2009	Interpretation	July 2012	SC1	SA above 1 GHz
C63.2-1996	Explanation	2007	SC1	Average value vs RMS value

C63.4-2014	Interpretation	Oct 2025	SC1	C63.4 (2014) Annex F insulating ground plane
C63.4-2014	Interpretation	May 2025	SC1	C63.4 (2014) Gaps in ground plane
C63.4-2014	Interpretation	Oct 2024	SC1	C63.4 (2014) Special test software
C63.4-2014	Interpretation	Feb 2024	SC1	C63.4 (2014) Conducted Emissions LISN choke
C63.4-2014	Interpretation	Apr 2022	SC1	C63.4 (2014) Sub clause 8.3.2.2 Meas. distance above 1GHz
C63.4-2014	Interpretation	Apr 2021	SC1	C63.4 (2014) Annex N.1 Clause B.4 antenna calibration
C63.4-2014	Interpretation	Jan 2021	SC1	C63.4 (2014) Clause 8.2.3 measurement ant. distance
C63.4-2014	Interpretation	June 2019	SC1	C63.4 (2014) Annex N vs. C63.5 re/ symmetry
C63.4-2014	Interpretation	June 2019	SC1	C63.4 (2014) Clauses 5.5.1 & 8.2.4 sVSWR
C63.4-2014	Interpretation	June 2019	SC1	C63.4 (2014) Annex N.1 antenna symmetry
C63.4-2014	Interpretation	Dec 2018	SC1	Clause 4.5 Horn antenna aperture
C63.4-2014	Interpretation	Dec 2017	SC1	Annex_N_1b2_antenna_symmetry
C63.4-2014	Interpretation	Mar 2017	SC1	Clause_5_5_1a1_and_fig6_site_validation
C63.4-2014	Interpretation	Feb 2017	SC1	Annex D.3 Horizontal Polarization
C63.4-2014	Interpretation	Aug 2016	SC1	Clause_4_4&5_6_In_situ_LISN_use
C63.4-2014	Interpretation	July 2016	SC1	Clause 5.4.1 & 5.4.2 RSM / NSA
C63.4-2014	Interpretation	May 2016	SC1	Annex N.4.3 use of attenuators
C63.4-2014	Interpretation	Apr 2016	SC1	Double ridge horn aperture
C63.4-2014	Interpretation	Jan 2016	SC1	Clause 4.5.1 CISPR or ANSI antenna calibration
C63.4-2014	Interpretation	Jan 2016	SC1	Clause 5.5.1 Absorber height
C63.4-2014	Interpretation	Jan 2016	SC1	Annex D3_2_NSA_for_alternate_sites
C63.4-2014	Interpretation	Nov 2015	SC1	NSA_for_alternate_test_sites_Annex_D_4
C63.4-2014	Interpretation	Aug 2015	SC1	NSA phase center of antenna
C63.4-2014	Interpretation	July 2015	SC1	Site validation distance
C63.4-2014	Interpretation	June 2015	SC1	Exploratory emissions Clause 8.3.1.2
C63.4-2014	Interpretation	May 2015	SC1	Antenna Symmetry Annex N.1
C63.4-2014	Interpretation	May 2015	SC1	NSA Measurement Annex D.3
C63.4-2014	Interpretation	May 2015	SC1	NSA Measurement Annex D.2
C63.4-2014	Interpretation	Oct. 2014	SC1	NSA_Schwarzbeck
C63.4-2009	Interpretation	June 2015	SC1	Testing large TVs as floor standing
C63.4-2009	Interpretation	Apr 2015	SC1	LISN Receptacle Distance
C63.4-2009	Interpretation	Jan 2015	SC1	LISN_vertical_plane_w_absorber
C63.4-2009	Interpretation	Jan 2015	SC1	Text takes precedence over figures
C63.4-2009	Interpretation	June 2012	SC1	GP around turntable
C63.4-2009	Explanation	Mar 2012	SC1	Use of spectrum analyzer
C63.4-2009	Explanation	Mar 2012	SC1	Use of hybrid antenna 30-1000 MHz
C63.4-2009	Explanation	Jan 2012	SC1	Spectrum-analyzer requirements
C63.4-2009	Explanation	Oct 2011	SC1	Measurement of ceiling-mounted devices
C63.4-2009	Explanation	June 2011	SC1	Antenna Pattern Maximization
C63.4-2009	Explanation	June 2011	SC1	Antenna Factor
C63.4-2009	Explanation	June 2011	SC1	Site Validation
C63.4-2009	Explanation	May 2011	SC1	Use of term “passive loop” in C63.4
C63.4-2009	Explanation	Feb 2011	SC1	Cone of radiation
C63.4-2009	Explanation	Oct 2010	SC1	Use of LISN extension cord
C63.4-2009	Explanation	Oct 2010	SC1	LISN tolerance
C63.4-2009	Explanation	Aug 2010	SC1	Calibration interval
C63.4-2009	Explanation	May 2010	SC1	Use of hybrid antenna above 1 GHz
C63.4-2009	Interpretation	Mar 2010	SC1	1 GHz site validation interval
C63.4-2009	Interpretation	Mar 2010	SC1	C63.5-2006 applied to C63.4-2009
C63.4-2009	Interpretation	Mar 2010	SC1	LISN calibration (diagram)
C63.4-2003	Explanation	Feb 2005	SC1	Use of absorber material above 1 GHz
C63.4-2003	Explanation	Feb 2005	SC1	On-site vs off-site calibration of LISNs
C63.4-2003	Explanation	Jan 2005	SC1	Requirements for testing table-top devices
C63.4-2003	Explanation	Dec 2004	SC1	Use of IEEE Std. 213-1987
C63.4-2003	Explanation	Oct 2004	SC1	Use of C63.5 only for antenna calibration
C63.4-2003	Explanation	Oct 2004	SC1	Location of monitor display
C63.4-2003	Explanation	2004	SC1	Exercising EUT during testing

C63.5-2017	Interpretation	Oct 2025	SC1	C63_5_2017_Annex_F_dipole_antenna_factors
C63.5-2017	Interpretation	Feb 2024	SC1	C63_5_2017_Annex_F_delta_antenna_factors
C63.5-2017	Interpretation	Dec 2022	SC1	C63_5_2017_Clause_M4_uncertainty_contributors
C63.5-2017	Interpretation	Sept 2021	SC1	C63_5_2017_Annex_I_2_biconical_calibration
C63.5-2017	Interpretation	Sept 2020	SC1	C63_5_2017_Clause_J.2.1.2(d)_ground_plane_size
C63.5-2017	Interpretation	Nov 2017	SC1	C63_5_2017_Clause_5_1_1e_attenuator_selection
C63.5-2017	Interpretation	Oct 2017	SC1	C63_5_2017_Clause_4_4_3_Rx_antenna_scan_height_R1
C63.5-2006	Interpretation	Jan 2018	SC1	C63_5 2006 Annex H Antennas for NSA
C63.5-2006	Interpretation	Mar 2016	SC1	C63_5_2006_Annex_A_A_1_formula
C63.5-2006	Interpretation	July 2014	SC1	C63_5_2006_07_07_2014_200MHz_null.pdf
C63.5-2006	Interpretation	June 2014	SC1	C63_5_2006_06_17_2014_horn_height.pdf
C63.5-2006	Explanation	Dec 2013	SC1	C63_5_2006_12_3_2013_symmetry.pdf
C63.5-2006	Explanation	Dec 2012	SC1	C63.5_11DEC2012_H2%20SACS_req.pdf
C63.5-2006	Explanation	Dec 2012	SC1	C63 5_04DEC2012_SSMonOATS
C63.5-2006	Interpretation	Dec 2012	SC1	C63_5_Interp_2012_09_SSM_AUC_location
C63.5-2006	Interpretation	Aug 2012	SC1	C63.5_interp_SACS_req_freq_range_Aug2012
C63.5-2006	Explanation	June 2012	SC1	Schwarzbeck antennas as reference antenna method antenna
C63.5-2006	Explanation	June 2012	SC1	SACS requirement
C63.5-2006	Explanation	May 2012	SC1	Effective date of explanations on C63 standards
C63.5-2006	Explanation	Oct 2011	SC1	Hybrid antenna calibration / LP above 1 GHz
~~C63.5-2006~~	~~Explanation~~	~~Oct 2011~~	~~SC1~~	~~Reference antenna / Roberts ~~[1]~~~~
C63.5-2006	Explanation	Apr 2011	SC1	Annex A equation
C63.5-2006	Explanation	Apr 2011	SC1	Use of hybrid antennas for NSA
C63.5-2006	Explanation	Sept 2010	SC1	EMC labs calibrating own antennas allowed
C63.5-2006	Explanation	July 2010	SC1	Use of semi-anechoic chamber for determining GCSF - #2
C63.5-2006	Interpretation	June 2010	SC1	Annex A equation
C63.5-2006	Explanation	May 2010	SC1	Use of hybrid antenna above 1 GHz
C63.5-2006	Interpretation	May 2010	SC1	Use of linear extrapolation for bicon antenna correction factors
C63.5-2006	Explanation	May 2010	SC1	Use of semi-anechoic chamber for determining GCSF - #1
~~C63.5-2006~~	~~Explanation~~	~~May 2009~~	~~SC1~~	~~Use of Schwarzbeck dipoles ~~[2]~~~~
C63.5-2004	Explanation	Sep 2005	SC1	Use of free-space antenna factor

C63.10-2013	Interpretation	May 2025	SC4	Clause 11 Average Measurements w/ reduced VBW
C63.10-2013	Interpretation	Nov 2021	SC4	Clause 6_9_2_&_6_9_3_RBW
C63.10-2013	Interpretation	Apr 2015	SC4	Clause_6_4_6_Loop_orientation_v2
C63.10-2013	Interpretation	Nov 2015	SC4	Millimeter wave procedures
C63.10-2013	Interpretation	June 2015	SC4	Definition of “plot”
C63.10-2009	Interpretation	Apr 2010	SC4	Error including peak excursion limit in C63.10

C63.19-2011	Interpretation	July 2012	SC8	MIF and operating mode for LTE
C63.19-2011	Interpretation	July 2012	SC8	T coil audio levels for LTE
C63.19-2011	Interpretation	July 2012	SC8	Concurrent transmitters
C63.19-2011	Interpretation	July 2012	SC8	Simultaneous transmitters
C63.19-2007	Interpretation	Mar 2008	SC8	Separation distances correction

C63.26-2015	Interpretation	May 2025	SC4	C63.26-2015 Annex I measurement bandwidth

C63.27-2021	Interpretation	May 2024	SC7	Clause A3331 Tier 2 Guidance for WiFi