Order Tray | Contact Us | Home | SIG Lists

[aprssig] Tracking and Stacking

Andrew Rich vk4tec at people.net.au
Thu Sep 20 19:33:39 UTC 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Internal Virus Database is out-of-date.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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.tapr.org/pipermail/aprssig/attachments/20070921/5791a2f7/attachment.htm 


More information about the aprssig mailing list