Why is there no significant difference between the wireless interference generated by a regular wireless bridge and a wireless relay to the surrounding area?

The bridge has only one card “WiFi Client”. After the “Wifi Client” connects to a hotspot, it will always send renewal packets to the connected hotspot, and the signal generated here will cause some interference to the nearby environment.

The relay device has two network cards “WiFi Client” and “WiFi Server”. WiFi Client” has the same function as the ‘WiFi Client’ card in the bridge mentioned above. The “wifi server” card does not emit any signal under normal circumstances, and only when the cell phone and other end devices scan for nearby signals, the “wifi server” card will generate an answer signal. 

To summarize, the signal interference generated by wireless relay and wireless bridge mainly comes from “wifi client” network card, therefore, there is no obvious difference between the wireless interference generated by ordinary wireless bridge and wireless relay.