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Rate Adaptation dynamically adjusts both the MCS and the number of streams depending on RF conditions. Poor RF
conditions (i.e. interference) causes PER to increase. PER and MCS are inversely correlated meaning that as PER
increases, MCS decreases and vice versa.
The radio usually uses 2 streams, but it may drop to one stream if RF conditions are poor. You may also see the
number of streams change periodically because of tests that Rate Adaptation performs to optimize performance.
This is expected and normal.
Related:
Client FAQ: What SNR is required for each MCS?
Client FAQ: What is the sensitivity for each MCS index?
Client FAQ: What's a good EVM?