Looks like I spoke too soon about the quantization, because here are the next two traunches of voltage measurements:
55,[Sender:2],353 ABCDEFGHIJKLMNOPQRSTUVWXYZ012345678901234567890123456789,[RX_RSSI:-34]
56,[Sender:2],353,[RX_RSSI:-33]
57,[Sender:2],344,[RX_RSSI:-33]
58,[Sender:2],337,[RX_RSSI:-33]
59,[Sender:2],336,[RX_RSSI:-34]
60,[Sender:2],336,[RX_RSSI:-34]
61,[Sender:2],336,[RX_RSSI:-35]
62,[Sender:2],336,[RX_RSSI:-34]
63,[Sender:2],336,[RX_RSSI:-35]
64,[Sender:2],336,[RX_RSSI:-33]
65,[Sender:2],327,[RX_RSSI:-34]
66,[Sender:2],327,[RX_RSSI:-34]
67,[Sender:2],327,[RX_RSSI:-34]
68,[Sender:2],327,[RX_RSSI:-35]
69,[Sender:2],327,[RX_RSSI:-34]
70,[Sender:2],327,[RX_RSSI:-35]
71,[Sender:2],327,[RX_RSSI:-34]
72,[Sender:2],327,[RX_RSSI:-34]
73,[Sender:2],327,[RX_RSSI:-35]
74,[Sender:2],327,[RX_RSSI:-34]
75,[Sender:2],327,[RX_RSSI:-35]
76,[Sender:2],327,[RX_RSSI:-35]
77,[Sender:2],327,[RX_RSSI:-35]
78,[Sender:2],327,[RX_RSSI:-35]
79,[Sender:2],327,[RX_RSSI:-35]
80,[Sender:2],327,[RX_RSSI:-34]
81,[Sender:2],327,[RX_RSSI:-35]
82,[Sender:2],323,[RX_RSSI:-35]
83,[Sender:2],323,[RX_RSSI:-34]
84,[Sender:2],323,[RX_RSSI:-35]
85,[Sender:2],323,[RX_RSSI:-34]
86,[Sender:2],323,[RX_RSSI:-35]
87,[Sender:2],323,[RX_RSSI:-35]
88,[Sender:2],323,[RX_RSSI:-35]
89,[Sender:2],323,[RX_RSSI:-34]
90,[Sender:2],323,[RX_RSSI:-35]
91,[Sender:2],320,[RX_RSSI:-35]
92,[Sender:2],317,[RX_RSSI:-34]
93,[Sender:2],353 ABCDEFGHIJKLMNOPQRSTUVWXYZ012345678901234567890123456789,[RX_RSSI:-35]
94,[Sender:2],353,[RX_RSSI:-35]
95,[Sender:2],344,[RX_RSSI:-35]
96,[Sender:2],336,[RX_RSSI:-34]
97,[Sender:2],336,[RX_RSSI:-35]
98,[Sender:2],336,[RX_RSSI:-35]
99,[Sender:2],336,[RX_RSSI:-35]
100,[Sender:2],336,[RX_RSSI:-35]
101,[Sender:2],327,[RX_RSSI:-35]
102,[Sender:2],327,[RX_RSSI:-35]
103,[Sender:2],327,[RX_RSSI:-34]
104,[Sender:2],327,[RX_RSSI:-35]
105,[Sender:2],327,[RX_RSSI:-35]
106,[Sender:2],327,[RX_RSSI:-35]
107,[Sender:2],327,[RX_RSSI:-35]
108,[Sender:2],327,[RX_RSSI:-35]
109,[Sender:2],327,[RX_RSSI:-35]
110,[Sender:2],327,[RX_RSSI:-35]
111,[Sender:2],327,[RX_RSSI:-35]
112,[Sender:2],327,[RX_RSSI:-35]
113,[Sender:2],327,[RX_RSSI:-35]
114,[Sender:2],327,[RX_RSSI:-35]
115,[Sender:2],323,[RX_RSSI:-34]
116,[Sender:2],323,[RX_RSSI:-35]
117,[Sender:2],323,[RX_RSSI:-35]
118,[Sender:2],323,[RX_RSSI:-35]
119,[Sender:2],323,[RX_RSSI:-35]
120,[Sender:2],323,[RX_RSSI:-35]
121,[Sender:2],323,[RX_RSSI:-35]
122,[Sender:2],320,[RX_RSSI:-35]
123,[Sender:2],320,[RX_RSSI:-35]
124,[Sender:2],320,[RX_RSSI:-35]
125,[Sender:2],320,[RX_RSSI:-34]
126,[Sender:2],320,[RX_RSSI:-35]
127,[Sender:2],320,[RX_RSSI:-35]
128,[Sender:2],320,[RX_RSSI:-35]
129,[Sender:2],320,[RX_RSSI:-35]
130,[Sender:2],317,[RX_RSSI:-35]
I'm spacing all the transmissions a minute apart now, so it takes longer to gather the data.