nrf51 RSSI question

[HakJae]

Hello,

I am currently working on the development related to RSSI of beacon using nRF51_SDK_9.0.0_2e23562(SDK).
The beacons I’m using are developed with this SDK as well.

I placed beacons away from my phone about 1.1m and 1.3m, and checked RSSI of each beacon to get RSSI and distance data.

The result appears as the image below.

Looking at the chart above, the blue line and green line seem like to have repeated patterns in a particular way.

I want each beacon to have a consistent pattern, not repeated, but I don’t know what causes this.
Could you explain why they have repeated patterns and let me know how to not get repeated patterns?

Thank you.

[Andreas]

Hi,

 

This is common when measuring radiated, pretty much everything in your surroundings will affect how the signals are reflected towards the smart phone. Even small, presumably negligible changes can/will have an impact.

 

The signal strength is not all that great at 1m though, have you tuned your antenna?

 

Best regards,

Andreas