12-25-2016, 10:53 PM
signal dBm
what do we mean by dBm? signal moving from 183 to - 113?
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[CPAP] signal dBm
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jacqueslaferriere
Posts: 1 Threads: 1 Joined: Dec 2016
Machine: resmed airsense 10 
kwhenrykerr
Posts: 544 Threads: 18 Joined: May 2016
Machine: DreamStation Auto, AirSense 10 Auto
justMongo
Posts: 4,633 Threads: 130 Joined: Sep 2013
Machine: ResMed VPAP Auto (S9)
12-26-2016, 10:07 AM
RE: signal dBm
Since Signal Strength has to be relative to some power level; the standard reference is 1 milliWatt. And since Signal Strength may vary over decades, a base 10 logarithm is used. Hence the deciBel is use as it it logarithmic. Negative numbers indicate power levels less than 1 milliWatt.
https://en.wikipedia.org/wiki/DBm Admin Note:
JustMongo passed away in August 2017
Click HERE to read his Memorial Thread ~ Rest in Peace ~
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