Signal Strength Fluctuating Wildly

My signal strength is fluctuating from -0 to -60 on both the 2.4g and 5g bands on a regular basis. I’m seeing a sawtooth pattern. I have attached a screen capture.
This does not seem normal. My Wi-Fi works ok, but I’m concerned about this.

This is on a Windows 10 Desktop PC that does not move. The AP is about 15 feet away in the next room.
I am using a Realtek 8812BU Wireless LAN 802.11ac USB NIC. It’s connected to a USB 2 port, my current Windows does not have a USB 3 port.

Any suggestions would be great.
Thank you.

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Hi @donmichaels1, and welcome to the MetaGeek Community! Thanks for you post, that is a wild-looking screenshot. I can say with very close to 100% confidence that those readings of 0 dBm are incorrect. I haven’t done the math in a while, but your AP would have to transmit at a very high power level in order for your Realtek adapter to pick up 0dBm through any amount of free space.

Way back when we first wrote inSSIDer (over 10 years ago!), we used to see things like this quite a bit. Windows relies on the Wi-Fi adapter driver to get those power readings, and some drivers seem to use a 0 as a default when they didn’t get a good reading from the hardware. That seems like what is probably going on here. You could with Realtek or Windows update to see if there is an update to the driver, it might improve this behavior. In any case, I think you can safely ignore the 0 dBm readings.

Even then, it will be kind of odd to see RSSI readings bouncing between -60 dBm and -17 dBm in a fixed location. In that case, I’m still more inclined to think this is due to an anomaly in the Realtek adapter hardware, firmware or driver software that due to the actual transmitted signal from the AP varying that much from one beacon to the next.

Thank you very much Brian! I really appreciate your guidance. I will try to update the Realtek adapter.

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