Updated with radio schemes.

README.md

@@ -95,3 +95,29 @@ tree -L 1
 
 - RadioHead RFM9x Library
 - TinyGPS++
+
+
+## Radio(LoRa) Scheme
+
+### Variable TX Power
+
+The radios are setup to try and minimize their signiture as much as possible.
+
+This is done by setting the transmitters to their minimum needed power. This
+is determined expirmentally and auto adjusted on the fly, using the following
+algorithm.
+
+1. Set TX power to minimum.
+2. Try to send data:
+    1. Upon failure increase power.
+    2. Repeat until maxpower or failure.
+
+The goal of this setup is both to reduce bandwith usage but also to save on
+the battery power when possible.
+
+### Data Integrity
+
+The messages and data sent over the radio module's makes use of the CRC
+checksum availbility. Invalid messages are rejected.
+
+