"[email protected]" <[email protected]> writes: > For signal (signal1, signal2, etc..), I have link-quality (0-255) and dBm > (negative values).
I don't mean to contradict anything already said, but it's good to understand that dBm means dB relative to 1 mW (milliwatt, 10^-3 W), which is the standard way to measure RF power. While calibration is hard, it is entirely sensible for a receiver to measure signal strength in dBm. As an example -30 dBm means 30 dB, which is 3 B, which is 10^3 = 1000 less than 1 mW, which means 1 uW. As a received signal strength this is huge. The smallest signal strength that works depends on the modulation and data rate. A very rough notion of a minimally workable signal strength might be -100 dBm. Take that with a huge grain of salt. Also realize that much equipment isn't calibrated or close, so this is all relative more than it should be. But typically, relative values from the same receiver can be compared. Some stations (Davis) report something that is more or less % of recent transmission that were received. This is correlated with strength but is fundamentally different. In RF data networking, what really matters is if packets are received. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/rmift2z5a11.fsf%40s1.lexort.com.
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