Your cell phone’s signal strength is measured in decibels. This is because it’s a convenient way to express both very large and very small values in short form.ĭBm is used to define signal strength in electronic equipment such as cellular signal boosters, wires and cables, radio and audio frequencies. dBm is the unit used to express the absolute power of radio, microwave, and fiber-optical communication networks. What is dBm?ĭBm is the power ratio of decibels (dB) to one milliwatt (mW). Since higher numbers represent a more favorable dB reading, cellphone users should look for signal strength numbers closer to -50 dBm. The dB in any given area for a cell phone will almost always fall somewhere between -50 dB and -115 dBm. Word to the wise: instead of cellphone bars, cell phone users should look for phones that provide better dB readings in their key communication areas. Most providers still use bars as a scale to show, in general, how good or bad a cell signal may be, but this should be used as a general range instead of an actual signal analysis. However, since these bars don’t have actual values, this diminishes the meaning of the claim. Have you ever had a call cut-out even when you’ve got two or three bars? Yep, we have too.īars have been used as a marketing technique for many wireless carriers who brag that they have more bars than the competition. Once the carrier knows you have enough signal to make a call, bars can be displayed any way they would like. However, there is no regulation for the number of bars corresponding with actual signal strength. The bars on a cellphone are meant to visually represent signal strength. A booster with a higher gain value will provide a stronger signal and/or a coverage area than one with a lower gain value. Gain is usually measured in logarithmic decibel units or dBs, making “dB gain” an expression of amplification.Ī gain value represents the relative level of signal enhancement a booster and/or antenna is capable of providing. This is usually done by adding energy from a power supply to the signal. In electronics, a gain is the increase of power or amplitude of a signal from an input to an output port. What is dB gain? How can I check my dB signal strength? What is good dB signal?
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