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,
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David Schaefer
Technical Manager
Element Materials Technology
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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
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