Is there any correlation in distance between different devices in a BLE connection?

[W.F.K]

I am curious whether there is a correlation in distance between different devices in a BLE connection.

A picture is attached to describe the situation.

A sensor-board will transfer sensor data to central board, and the phone can read the sensor-board data instantly via central board.

Here is the distance of TX in actual measurement:
- If we keep distance A at minimum 0.1m, then we can get distance B for 50m maximum.
- If we keep distance A at maximum 45m, then we can get distance B for 7m maximum.
Is there any correlation factor between distance A and B??

In other words, distance A + distance B = almost a fixed distance.

If distance A is getting short, then distance is getting long.

Does it make sense? 

[Kaja]

Hi, 

this does not make sense from a radio perspective, if the DK is connected with one link to the phone and one link to the sensor. 

Your should check your set up, SW and HW.

Best regards,
Kaja