Even when skipping a full pre-design site survey, performing a spectrum analysis walkthrough is considered a best practice. This is because spectrum analysis provides insights into non-Wi-Fi interference sources, such as microwave ovens, Bluetooth devices, cordless phones, and other RF-emitting equipment that may affect WLAN performance.
From CWDP-305:
“A spectrum analysis walkthrough of the facility, even in the absence of a full site survey, can reveal sources of interference that would otherwise go undetected. This step is highly recommended to validate the RF environment.”
— Reference: CWDP-305 Official Study and Reference Guide, Chapter on ProtocolandSpectrum Analysis
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