[aprssig] APRS Icons on Garmin Receivers

Stephen H. Smith wa8lmf2 at aol.com
Sun Feb 11 03:56:39 CST 2007

scott at opentrac.org wrote:
>> I would be interested in a device which sends detailed 
>> Waypoint info to my GPS 
>> using the Garmin Protocol and APRS icons,  yet preserves all 
>> of the features 
>> available with the D7/D700.  
> Will the D700 output raw packet data to the serial port in APRS mode?  If
> so, I could do a stripped-down version of the T2 firmware that'd handle the
> decoding and Garmin output.
> Scott
> N1VG

In "APRS" mode, the D700's internal firmware creates an APRS terminal on 
the control head's screen and sends nothing to the serial port.  The 
serial port WILL accept commands to configure the radio (load/read 
memories, switch bands, change freq and PL, dim the panel, etc) and to 
change TNC mode (APRS, PACKET or OFF).   

In "PACKET" mode, the D700 just acts like any radio connected to a TNC.  
What comes out of the D700's DB9 serial port is about the same as you 
would get from a TNC2 in normal conversational mode, plus GPS 
passthrough from the dedicated GPS port ala KPC3+. 

You can even live dangerously and command the D700 into KISS mode, but 
your external device must be really fast on the draw to accept data as 
soon as it appears, in order to avoid the dreaded KISS overrun from a 
far-too-small buffer in the '700s internal TNC.


Stephen H. Smith    wa8lmf (at) aol.com
EchoLink Node:      14400    [Think bottom of the 2M band]
Home Page:          http://wa8lmf.com  --OR--   http://wa8lmf.net

NEW!   TNC Test CD

JavAPRS Filter Port 14580 Guide

"APRS 101"  Explanation of APRS Path Selection & Digipeating

Updated "Rev G" APRS            http://wa8lmf.net/aprs
Symbols Set for UI-View,
UIpoint and APRSplus:

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