Digital Matter Support

Bluetooth Range and Battery Life

The Bluetooth Technology website does an excellent job of describing what the range of Bluetooth is. In short 'it depends'


See here before reading on: Understanding Bluetooth Range


At the bottom of the page, there is a useful calculator where you can input some device values to get a quick range estimate. 


Values to use are:


'Standard' Bluetooth


Receiver Sensitivity

Select LE 1M, -95dBm


Transmit Power

+8dBm is standard, can be configured on the Guppy down to -20dBm

A version of the Guppy can be produced for MOQ that will allow the power to be set up to +19dBm

Transmitter Antenna Gain

Select 0dBi

Receiver Antenna Gain

Select 0dBi


'Long Range' Bluetooth


Receiver Sensitivity

Select LE 125K (coded), -104dBm


Transmit Power

+8dBm is standard, can be configured on the Guppy down to -20dBm

A version of the Guppy can be produced for MOQ that will allow the power to be set up to +19dBm

Transmitter Antenna Gain

Select 0dBi

Receiver Antenna Gain

Select 0dBi 



Path Loss

From here you can choose different environments to get a feel for what kind of range you may get. 



Factors influencing range as described on the Bluetooth page and how they relate to our devices


PHY

Our BLE devices are fitted with Bluetooth 5.0 Modules (aside from the SensorNode BT which is 4.2)

5.0 supports a 'long range' phy (mode). This uses more power, but gives longer range.


Receiver Sensitivity

Receiver sensitivity can be thought of as how well the receiving device can 'hear' - or the quietest sound you could make out and understand in a room. 


Our gateway devices - Eagle, Remora2 and G120 use high quality sensitive BLE receivers. This quantity is fixed. 

So the question 'what is the range of the Remora2' is not incorrect, but it is not the right question to be asking. It is more to do with the transmit power of the tag.


Transmit Power

Transmit power can be thought of as how loud someone across the room is talking to you. 

If they are talking quietly, it will be a bit harder for you to hear. But if they are shouting - they will use more energy, but there is more chance you will hear it!


The Guppy and SensorNode BT tags use a transmit power of +8dBm. 


Path Loss

If a lot of stuff is in the way, signals get attenuated (dampened). This can greatly impact the range. 


Our range tests

See here for our : Guppy BLE Range Test and Battery Life results


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