Signal strengths for mobile networks are always negative dBm values, because the transmitted network is not strong enough to give positive dBm values. Also, in temperature measurements, -85 is colder than -65 degrees. If you owe the bank 85 dollars/rands/euros/rupees (-85), you're poorer than if you only owe them 65 (-65), i.e. Alternatively, think about your bank account. To understand this, you need to look at negative numbers. 85 dBm is less powerful (smaller) than -60 dBm. Your actual question was "does the - sign count?" There is also a comparison table on the Wikipedia english page, but the value it gives for mobile networks is a bit off. There is a conversion calculator and a comparison table here. Because the calculation is logarithmic, every increase of 3dBm is approximately equivalent to doubling the actual power of a signal. P(W) = the absolute power measured in Wattsįrom this formula, the power in dBm of 1 Watt is 30 dBm. The power in dBm is the 10 times the logarithm of the ratio of actual Power/1 milliWatt.ĭBm stands for "decibel milliwatts".
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