5 W APRS transmitter
The raw value coming out of the A/D converter is sent directly. The battery voltage gets divided by 3 before going into the 10 bit (1024 steps) A/D converter. The microcontroller runs at 3.3 V.
Battery is at 8.0 V.
ADVALUE = 8/3/3.3*1024 = 827, convert to hex and you get 0x338.
Reported value is V338.
Convert 0x338 to decimal and multiply by 9.9/1024
827*9.9/1024 = 7.99 V