Differing WiFi Signal Strength on UNO WiFi Rev2s

Projects Networking, Protocols, and Devices
1

I have two UNO WiFi Rev2s. One I have installed in my boiler house shed and one I use in my computer room with the IDE.

I recently brought the Boiler House UNO in to update the firmware version.
I noticed a rather stark difference between the two UNOs as far as wifi signal strength.
There is a wifi repeater within a couple feet of the work table where the UNOs are placed. The UNO I use in the computer room registered -68 dbm while the boiler house UNO shows a signal around -15 dbm, which is a very strong number.
That makes a difference of over 50 dbm between the two. Even with the boiler house UNO back in the boiler shed and communicating through a wall to my house router it registers a -52 db signal level. That is stronger than the UNO sitting next to a repeater.
I thought it odd there would be such a wide difference between the two.

2

I will take a SWAG and say maybe the boiler is acting as a reflector for the antenna.

3

I will take another guess and that is besides the ability for your devices to automatically change WIFI channels, they can also vary the transmit power based on the received signal strength. You are dealing with intelligent devices, not dumb electronics.

4

A 5o dbm signal strength difference still seems like a large variance even if they are "intelligent."

5

Be careful to not mix db and dbm. dbm is output power referenced to 1 milliwatt. db is referenced to a standard received signal.

6

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