[aprssig] Tracking and Stacking
Andrew Rich
vk4tec at people.net.au
Thu Sep 20 15:33:39 EDT 2007
I made a simple tracker and realised I was sending full asii characters.
I now realise that I can stack more into a packet if I use 4 bit stuffing.
The character "4" and The chracter "7"
Ascii code for 4 - 0011 0100
Ascii code for 7 - 0011 0111
But if you look closely, all you ever want to do is go from 0 - 9
0000 - 1111 (0 to 15 in binary)
So you could go from
00110100 (4) 00110111 (7) to 0100 (4) 0111 (7) and get two digits in one
byte
----------------------------------------------------------------------------
Andrew Rich VK4TEC
vk4tec at people.net.au
http://www.tech-software.net
Internal Virus Database is out-of-date.
Checked by AVG Free Edition.
Version: 7.5.485 / Virus Database: 269.13.16/1004 - Release Date: 12/09/2007
5:22 PM
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