It is in both C63.4 and C63.10 for above 1 GHz (so not a semi anechoic chamber due to the absorber on the ground plane).
C63.4 Clause 8.3.2.2 The final measurements are performed on a site meeting the requirements of 5.5. For measurements above 1 GHz, use the cable, EUT arrangement, and mode of operation determined in the exploratory testing to produce the emission that has the highest amplitude relative to the limit. Place the measurement antenna away from each area of the EUT determined to be a source of emissions at the specified measurement distance, while keeping the measurement antenna aimed at the source of emissions at each frequency of significant emissions, with polarization oriented for maximum response. The measurement antenna may have to be higher or lower than the EUT, depending on the radiation pattern of the emission and staying aimed at the emission source for receiving the maximum signal. The final measurement antenna elevation shall be that which maximizes the emissions. The measurement antenna elevation for maximum emissions shall be restricted to a range of heights of from 1 m to 4 m above the ground or reference ground plane. The data collected shall satisfy the report requirements of Clause 10. C63.10 The emission signal shall be kept within the illumination area of the 3 dB beamwidth of the antenna so that the maximum emission from the EUT is measured. This may be achieved by either pointing the antenna at an angle toward the source of the emission or by testing the EUT as described in 6.6.3.3. 6.6.3.3 covers testing an EUT in 3 orientations. Thanks, [ElementSignature] [cid:image400053.jpg@7881725B.5CD2D394] David Schaefer​ Technical Manager Element Materials Technology 9349 W Broadway Ave Brooklyn Park , MN 55445 , United States O +1 612 638 5136<tel:+1%20612%20638%205136> ext. 10461 david.schae...@element.com<mailto:david.schae...@element.com> www.element.com<https://www.element.com/> [cid:image484815.png@F1FA93C6.BB8CF5D6]<https://www.linkedin.com/organization-guest/company/element-materials-technology?challengeId=AQFf9AemZ4SobwAAAXOQwivOsnkHiTt2ByoCkOxVQjOGOjRlivicVgYlN1dz5QXjId9bpa0keWzfVxhl8KPj78uD6-S6nfqRsg&submissionId=e49e0dc0-96a3-2516-27fa-ee2e8c42b177> [cid:image249388.png@B4D7A038.7F6E9859]<https://twitter.com/ElementTesting/> [cid:image745206.png@D368BC8A.ECE2E452]<https://www.instagram.com/elementtesting/> [cid:image353197.png@9D68F2B1.0115AE3B]<https://www.youtube.com/c/ElementTesting> [cid:image954489.jpg@88AE9812.8813BAF5]<https://elementmaterials.eu.qualtrics.com/jfe/form/SV_3xQqm84s6IydI5D> From: Paolo Roncone [mailto:paoloc...@gmail.com] Sent: Wednesday, March 29, 2023 12:06 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Antenna tilting or boresigjting for radiated emissions CAUTION:This email originated from outside of Element Materials Technology. DO NOT click links or open attachments unless you recognize the sender and know the content is safe. Please contact IT Service Desk if you are in any doubt about this email. Hi all, Is there an FCC / ANSI requirement, or maybe just recommendation, for antenna tilting or boresighting wrt radiated emissions in a semi-anechoic chamber ? If yes, can you please get me the reference section in FCC Part15 or ANSI std or somewhere else? Thanks a lot in advance! Paolo - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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