What is DB Gain?

(Last Updated On: August 6, 2023)

What is DB Gain?

What is DB Gain? In simple terms, this means an increase in reception that a device can generate. For example, some provide + 23dB, while others can provide higher gain at + 50dB or even + 72dB. Let us look at exactly what a positive number followed by dB means in the performance of any cell phone signal booster.

Next, we will look at what a negative number means, followed by dBm, when measuring the cellular signal strength on your smartphone or signal meter.

When you look at the bars on your mobile phone that show the signal strength, this is an easy way to get an idea of   how good the mobile phone signal is where you are. If you are struggling to make a call, you can even use it to find a spot where the signal is better. However, the number of bands on your phone differs significantly, depending on which operator and smartphone you are using.

While one carrier can only show lane 1, the other can show lane 3 even if the same signal strength is received and both signals are at the same rate. Unfortunately, the reason for this is that there is no standard for how carriers and cell phone manufacturers should symbolize signal stripes.

However, all mobile phones can display the decibel (dB) gain that is more technical and accurate. Decibels (dB) is a measure of the strength of a cellular signal.

Gain is indicated as a positive number in cell phone signal amplification kits. It indicates an increase in signal strength. For example, the lowest gain amplifiers provide up to + 23dB gain.

Although we mention the “lowest gain” here, the increase in signal level by + 23 dB is very significant. Our high gain car wireless boosters deliver up to + 50dB. Highest Gain Cellular Signal Amplifiers are wireless amplifiers for multiple devices that provide up to + 72dB signal gain.

The decibel milliwatt (dBm) detector software, built into all smartphones, is used to measure the signal strength that the phone detects on the telephone operator’s network. It is a minus number. For example, here are three scenarios that explain it better:

  • -50 dBm usually means you have a very good signal (the best signal for all practical purposes), and it will show up as full bars on your phone.
  • -80dBm to -90dBm is the average signal strength that allows phone calls, although the user occasionally encounters a missed call and little static in conversations.
  • -110dBm would mean that the user will not have any signal reaching the phone and is in a dead zone. This area may display “no service” and maybe missing signal bars. Attempting to make outgoing calls will result in a redial prompt, and incoming calls will be directed directly to voicemail.

Now you can see how positively adding a dB number of up to + 23dB, + 50dB, or + 72dB to these negative dBm values   -50dBm, -90dBm, -110dBm has a huge positive effect on these negative dBm level values. dBm refers to the absolute power level, measured in decibels (Refers to 1 milliwatt (mW).

To convert the absolute power “P” (in watts) to dBm, use the formula dBm = 10 * log (P / 1 mW). This equation looks almost the same as for decibels (dB). However, the “P” power level has now been changed to 1 mW.


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