| Answer: The site validation requirements for radiated emissions compliance testing of unintentional (ANSI C63.4-2014) and intentional radiators (ANSI C63.10-2013) on an open area test site (OATS) (or alternative test site) are specified in Section 2.948(d). In general, test sites used for radiated emission measurements are required to comply with ANSI C63.4-2014, and validation of the test site shall be confirmed no less than once every three years. Test sites used to measure radiated emissions in the 30 MHz to 1 GHz range are required to comply with the site validation requirements in clause 5.4 of ANSI C63.4-2014. Test sites used for radiated emission measurements from 1 GHz to 40 GHz are required to meet the site validation requirements below: ANSI C63.4-2014 provides two options for test facilities used to make radiated emission measurements above 1 GHz: 1) the site validation criterion called out in CISPR 16-1-4:2010-04; or 2) a minimum area of the ground plane is covered with RF absorbing material as specified. ANSI C63.10-2013 requires the test site to conform to the site validation criteria called out in CISPR 16-1-4:2010-04. The FCC rules provide for a transition period for test sites to demonstrate compliance with the CISPR standard. During a three-year transition period, either option in ANSI C63.4-2014 may be used. However, at the end of the transition period, July 13, 2018, a test site used for radiated emission measurements for unintentional or intentional radiators is required to comply with CISPR 16-1-4:2010-04. Test laboratories are encouraged to start the transition to CISPR 16-1-4:2010-04 immediately so they have time to make any changes needed to their test sites to demonstrate compliance with the preceding requirements. | 
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