[OZAPRS] A Remote GPS.

[Darryl Smith]

Using the com-port loopback method it sounds like what you ware wanting
is a small PIC processor to convert the MIC-E RS-232 string into a
$GPRMC type GPS string? Is that correct.

Of course you may be able to take some virtual serial port software and
modify it with some processing...

Darryl



---------
Darryl Smith, VK2TDS   POBox 169 Ingleburn NSW 2565 Australia
Mobile Number 0412 929 634 [+61 4 12 929 634 International] 
Darryl at radio-active.net.au | www.radio-active.net.au  

-----Original Message-----
From: ozaprs-admin at marconi.ics.mq.edu.au
[mailto:ozaprs-admin at marconi.ics.mq.edu.au] On Behalf Of Noel Rowe
Sent: Sunday, 17 November 2002 6:44 PM
To: ozaprs at marconi.ics.mq.edu.au
Subject: [OZAPRS] A Remote GPS.


I have a need to reconstitute a mic-e encoded (compressed data) APRS
packet, to output it to a serial port as an NMEA sentence.  What I need
is in effect a "remote GPS" function.

This is a search and rescue operation by volunteers,  including several
radio amateurs.  The set up used is :-

(1) GPS on boat, feeding a TinyTrak1 V1.4  fitted inside a VHF marine
radio.
(2) The radio can also be used for voice, as a backup to another radio
on another channel. The data-after-voice feature is then used.
(3) VHF radio at control room on shore, with audio fed to a speaker, for
coms to boat, and also fed to a  PC soundcard input.
(4) AGW-pe software used to decode via the soundcard.
(5) UI-View32  is used to plot boat position.
(6) There is no data output PC to radio, this is an Rx only setup.

So far so good, works well.  But we need to run another program, as well
as UI-View, and that program needs a GPS input at a serial port.
However the GPS is remote in this case, out on the boat, but linked by
radio.  At some point in the chain listed above, we need a NMEA sentence
representing the one output from the boat GPS to appear at the base
stations PC, directed to a serial port.

In our case, instead of looping two hardware serial ports, we will use a
virtual serial port, to loop back to the other program, set to the
appropriate serial port number.  This part is set up and all working.
We just need to see NMEA GPS data.

Can anyone tell me how to achieve this?  Does software already exist?

Noel, ZL3GR.




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