Converting Watts and Milliwatts to dBm is slightly more tricky… You are now entering the wonderful world of logarithmic calculations! You will need to take into account the loss caused by cables and connectors as each component will add an element of loss. Also keep any antenna cable lengths as short as possible. Normally loss values will be expressed as dB loss per ft and you can typically find this value on the spec sheet. This one is easy, simply look up the dBi value of the antenna and apply it to the calculation.
Auto transmit power leverages RF data gathered by an AP to decide which radio transmit power levels would be best for client roaming and performance. By default, all AP radios are configured to use Auto Power.
Each AP may alternatively be configured with a static power setting on a per-radio basis. This instructs the AP to use the manually defined power setting instead of the Auto Power algorithm. The list of power settings available is determined per-band, per-regulatory domain. NOTE: There are cases where high transmit powers are available as options but mechanisms in the AP may prevent it from broadcasting at the configured power.
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Aside from difference in performance from different manufacturers, antennas are divided into 2 different parameters. Omnidirectional and Directional. An omnidirectional antenna acts just like a lightbulb. While a directional antenna acts in the same way a flashlight does. Omni sends signal in all directions while directional antennas send signal where you point. The dBi rating tells you a lot about how far that signal will travel.
The higher the dBi, the further distance the signal will travel. The antenna manipulates not increase the signal to act a certain way. Which way depends on the antenna.
The WiFi signal coming from the antenna is only changed based on the design.
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