What do we need to know about transmit power
KB ARTICLE TYPE: Field Notice
RELATED PRODUCTS: AP series
RELATED SOFTWARE VERSIONS: All
KEYWORDS: Transmit, Power, TxP, EIRP, Antgain
Here's all you need to know about transmit power:
Three concepts/terms
The relationship between the 3 terms:
EIRP = TxP + AntGain.
or
TxP = EIRP ‐ AntGain
In other words: EIRP is the transmit power including antenna gain, TxP is the transmit power excluding antenna gain.
Steps to configure the desired output power in Meru Systems Director:
1. Select the country that you're in, so that the system can enforce local regulatory limits.
2. Configure the antenna gain to the actual values of the actual antennas (No Cheating!!). If
you use the default antennas or APs with internal antennas, you can skip this step.
3. Configure the local‐power setting of the radio to the desired level. Note that this is
configured as EIRP!!!
Examples
‐ configure the antenna gain (AntGain) to 13
‐ configure local power (EIRP) to 30
‐ the system will program the radio to crank out a TxP of 17dBm.
Caveats
exceeds the capabilities of the radio. For example, if you configure EIRP = 30 and AntGain =
0, the resulting TxP would be 30 and that is more than what the radio can handle.
In such cases, the radio would simply drop down the TxP to the maximum capacity of the
radio. There is no indication to the user when that happens.
The maximum TxP of a radio depends on many factors (AP type, channel, data‐rate, etc.
Usually it is somewhere between 16 and 19 dBm per chain.
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