Engineer Predrug Gruevski returned home for the first time in a while and learned that there was a problem where Wi-Fi could only be used when it was raining. Told. that. I’m posting it on my blog.
Wi-Fi can only be used in rainy days
https://predr.ag/blog/wifi-only-works-when-its-raining/ 
Mr. Gruevski’s father was also an engineer, and through his company he designed and implemented all sorts of complex network systems, from Gigabit Ethernet in office buildings to intercity connectivity via line-of-sight microwave links. Mr. Gruevsky was therefore surprised to hear his father’s story. Magic He said, “When it rains, Wi-Fi connects.”
The rain actually worsened the communication quality, so Gruevski thought there must be another cause and decided to investigate the network. The Wi-Fi internet connection was working, but no matter what site I tried to open, the packet loss rate was 98% and nothing would load.
However, when it started raining, the situation changed completely. About 5 minutes after it started raining, the packet loss rate dropped to 0% and I was able to use the Internet comfortably. Gruevski said he couldn’t believe his eyes.
About 15 minutes after the rain stopped, the packet loss rate increased to over 90%. Internet connection is unavailable again. In the days since Gruevski returned home, the sky has been cloudy and rain has come and gone, with a pattern in which his internet connection has been restored each time it rains and then becomes unusable each time it stops. . finished.
Gruevski didn’t want to accept the magical phenomenon that Wi-Fi only works on rainy days, but the evidence was so clear that he had to. He had the option of looking at the weather forecast and planning his internet usage, but Gruevski decided to continue investigating the cause, saying, “Magical thinking is nonsense!” I am an engineer! ”
Gruevski’s family home has a special Wi-Fi configuration with a line-of-sight Wi-Fi bridge (
I installed long-distance Wi-Fi between my father’s office and the company’s ultra-high-speed line, which is a few blocks away. Now you can use it. When Gruevski investigated to determine which part of his system was at fault, he found that while his home communication was fine, there was a problem with the long-distance Wi-Fi connection between his office and his parents’ home. .
This long-range Wi-Fi had never been deployed since it was installed 10 years ago. Gruevski traveled back and forth between his home and his father’s office multiple times to check the components and cables that make up long-range Wi-Fi, but no matter what he checked, he couldn’t find any problems.
Gruevski was walking impatiently between his home and work when he looked around and noticed how much the neighborhood had changed since he’d been away. Many of the small shops in the neighborhood are new and many of the homes have been repainted. The trees, which were saplings, were growing rapidly.
Shocked, Gruevski ran back to his parents’ house and peered through the Wi-Fi antenna at his company’s Wi-Fi antenna. Then, the tree in the neighbor’s garden was swinging between the Wi-Fi antennas.
Since I installed a Wi-Fi antenna 10 years ago, I have been able to use long-distance Wi-Fi without any problems for many years, but as the years have passed, the tree next door has also grown. Ta. Just before Gruevski returned home, the top of the tree had grown to the point that it was blocking the Wi-Fi antenna communication, increasing the Wi-Fi packet loss rate to 98%.
The tree was just tall enough to interfere with the Wi-Fi antenna, so when it rained, the weight of the water caused the tree to sag and communication was restored. Immediately after the rain stopped, rainwater fell from the trees, again disrupting communications.
Gruevski replaced his old 802.11g device with a new 802.11n device. He says he used mathematics and physics rather than magic to improve his resistance to radio interference, allowing him to use his parents’ Wi-Fi even on sunny days.
