LoRa/LoRaWAN tutorial 9: EIRP and ERP
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This is part 9 of the LoRa/LoRaWAN tutorial.
In this video series different topics will be explained which will help you to understand LoRa/LoRaWAN.
It is recommended to watch each video sequentially as I may refer to certain LoRa/LoRaWAN topics explained earlier.
In this video I will explain what EIRP and ERP are.
The Effective Isotropic Radiated Power (EIRP) is the total power radiated by a hypothetical isotropic antenna in a single direction.
The Effective Radiated Power (ERP) is the total power radiated by an actual antenna relative to a half-wave dipole rather than a theoretical isotropic antenna.
EIRP = Tx power (dBm) + antenna gain (dBi) - cable loss (dBm)
For example: EIRP = 20 + 10 - 5 = 25 dBm
ERP = Tx power (dBm) + antenna gain (dBd) - cable loss (dBm)
For example: ERP = 20 + 7.85 - 5 = 22.85 dBm
Relationship EIRP and ERP:
EIRP (dBm) = ERP (dBm) + 2.15
What is the purpose of ERP and EIRP?
RF transmitting systems must adhere to certain rules set by the regulatory bodies such as FCC or ETSI.
One of these rules: radio devices must not exceed certain ERP or EIRP values set by these regulatory bodies.
Check out all my other LoRa/LoRaWAN tutorial videos:
• LoRa/LoRaWAN tutorials
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The presentation used in this video tutorial can be found at:
https://www.mobilefish.com/developer/...
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