tags:
- cellular
- wireless
- technology
- networks
- notes
- article
source: https://www.wilsonsignalbooster.com/pages/decibel-milliwatts-dbm
created: 2024-07-19What is a decibel (dB)?
A dB is a unit used to express the intensity / strength of a signal like sound or electrical power.
What is a milliwatt?
A milliwatt is a unit of power equal to one-thousandth of a watt.
What is a decibel-milliwatt (dBm)?
A dBm is a unit used to express the power of a signal through a logarithmic scale with reference to one milliwatt.
Because it's a logarithmic scale, a ... change in decibel-milliwatt value represents a ... change in signal power.
Because it's a logarithmic scale, a small change in decibel-milliwatt value represents a large change in signal power.
What is the dBm used to measure in cellphone signal boosters?
In cellphone signal boosters, the dBm is used to measure the strength of a signal before and after amplification.
What signal strength in terms of dBm is considered good?
In terms of dBm, a signal strength of -70 dBm or better is considered good.
What signal strength in terms of dBm is considered poor?
In terms of dBm, a signal strength of -110 dBm or worse is considered poor.
Is the dBm unit a part of the International System of Units (SI units)?
No, the dBm unit is not a part of the International System of Units (SI units).
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