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Why does WiFi signal drop by only one bar while internet speed drops by half? The router and phone were secretly shifting, so I copied down the gear shifter
The living room speed test was 940 Mbps, but by the bedroom it was just over 200 km/h left, and the signal icon had only dropped one bar. After searching for half a night, I finally understood: the grid count is about whether you can hear it, while the internet speed is about whether you can hear clearly. The router and phone secretly switch QAM settings every few tens of milliseconds according to the bit error rate. Every 6dB difference in signal-to-noise ratio requires a step down. The comparison table at the end of the article helps you locate which level your WiFi is stuck in....
