RSSI

[TexScan780D]

On the SDS200 lower-right of the display, there is a RSSI with a minus changing numbers and dBm, - numbers dBm. The number always changing. What is this?

-84 dBm
-88 dBm
-86 dBm
-87 dBm
-81 dBm
-82 dBm
-73 dBm

 

[nessnet]

It is your signal strength in dBm = decibel-milliwatts
dBm - Wikipedia

Basically, in your example above, the -73 is a stronger signal than the -84. Think of it this way - it is a negative number. The closer to 0 (zero), the stronger the signal is.

 

[RandyKuff]

 

[gmclam]

RSSI is Relative Signal Strength Indicator. It is displayed in voltage as dB below 1mV into 50 ohms. The larger the voltage, the stronger the signal. It's unlikely you'll see a signal as strong as 0dB or more (a positive value). I'm sure the circuit in the radio has its limits.

 

[TexScan780D]

Thank you everyone.