In one of the wireless data acquisition installations, there is no data transfer during rain and mist. The wireless...
system works in 2.4 GHz frequency. What could be the cause of this?
Anything encountered between a wireless transmitter and receiver can reduce signal strength through attenuation. This not only includes solid objects like walls and doors, but "liquid objects" like rain and mist.
According to the CWNA Study Guide, 2.4 GHz signals may be attenuated by up to 0.05 dB/km by torrential rain or 0.02 dB/km by thick fog. 5 GHz signals may be attenuated by up to 0.5 dB/km by torrential rain or 0.07 dB/km by thick fog. Rain can also reduce signal strength through water accumulation on other objects (trees, leaves, absorbent walls) which serves to increase their attenuation.
Another (potentially much larger) impact of rain/fog is the adverse effect of moisture on cables and connectors not sufficiently protected against exposure.
Note that this answer assumes that you're talking about wireless transfer between outdoor devices, where the rain actually falls in between transmitter and receiver. Indoor signal strength may not be noticeably affected by rain outside.
Dig Deeper on Wireless LAN (WLAN)
Related Q&A from Lisa Phifer
A remote access VPN connects remote users from any location to a corporate network. A site-to-site VPN, meanwhile, connects individual networks to ... Continue Reading
Licensed and unlicensed frequency bands serve different purposes for wireless communications. Find out the differences between the two bands and the ... Continue Reading
As the remote workforce increases, network managers and users might opt to set up two concurrent VPN connections from the same remote device. But ... Continue Reading