What could be a source of interference particularly in the 5 GHz band during a Wi-Fi site survey?

Microwave ovens are indeed a significant source of interference in the 5 GHz band during a Wi-Fi site survey. This is primarily because many microwave ovens emit signals in the 2.4 GHz range, which is adjacent to parts of the 5 GHz band, causing potential overlaps and interference. The energy from microwave ovens can disrupt wireless signals, leading to degraded performance of Wi-Fi networks operating near these appliances. This interference can manifest as dropped connections or reduced connection speeds, particularly if the microwave is used while devices are attempting to connect or communicate over Wi-Fi.

In contrast, wired connections do not contribute to wireless interference; they operate on a completely different medium. Printer usage might cause some network congestion if they are networked wirelessly but don’t particularly interfere with the radio frequencies used by Wi-Fi signals. Lastly, temperature and pressure changes do not directly affect the Wi-Fi radio frequencies in a way that would interfere with performance during site surveys. Thus, microwave ovens are the relevant source of interference to consider in this context.