The Friencom FC301 radio provides an RSSI signal output but the manual does not specify the relationship between RX signal strength and the voltage on the RSSI signal output.
I made these measurements by feeding an RF from a signal generator directly into the antenna input of the radio and measuring the RSSI output.
| Signal | Input | RSSI |
| 1 | 0.2uV | 620mV |
| 2 | 0.4uV | 660mV |
| 3 | 0.8uV | 738mV |
| 4 | 1.6uV | 835mV |
| 5 | 3.2uV | 1.0V |
| 6 | 6.3uV | 1.166V |
| 7 | 12.6uV | 1.338V |
| 8 | 25uV | 1.503V |
| 9 | 50uV | 1.637V |
| 9+10dB | 160uV | 1.924 |
| 9+20dB | 500uV | 2.200 |
| 9+30dB | 1.6mV | 2.344 |
| 9+40dB | 5.0mV | 2.415 |