[aprssig] D700-external PIC processing

[Jason Winningham]

On Feb 11, 2007, at 8:31 AM, Robert Bruninga wrote:

> Looks like CALL,LAT,LONG,SYMBOL,CSE,SPEED, then STATUS TEXT?
>
> My guess is that CSE is stored as 1-to-8 for the cardinatl
> points of the compass.

Not sure, but that could be for the on-screen compass.  Actual course  
is displayed as degrees on the detailed info screen.

> The above examples have no speed?

Yep, they're all fixed stations.  I just grabbed the first three in  
that old log file I had, without paying attention to the details.   
When I captured the file I should have captured some raw packet data  
from another TNC for correlation, but I didn't think of it at the time.

> But if this is true, then SOMONE should write a PIC processor to
> parse out of theese packets, any FREQUNCY info an either display
> it or something.

Unfortunately I couldn't figure out how to make data display on the  
D700 control head.  I specifically wanted to insert reports heard  
from other frequencies to have a unified listing on the D700 control  
head.

A packet parser would be helpful, but I think the most useful thing  
someone could do is reverse engineer the connection and protocol  
between the display head and the radio.  If we could wedge a  
microcontroller in there, we'd have something _really_ useful.  Given  
their replacement cost, I'm not too keen on hacking at mine. (:

It would probably be easier just to create a new control head and  
application interface (ala HamHud) and operate it that way.

-Jason
kg4wsv