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1-3 of 3 messages
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Aprs and TinyTrak3Plus
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by KC0WNY on May 9, 2008
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I am new to Aprs and getting more confused the more I read about it, I saw a PPT presentation about two way aprs, and doing more that just tracking. What brand of TNC will allow this? Will the TinyTrak3Plus do this? The Kenwood radio is too rich for me. Thanks
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RE: Aprs and TinyTrak3Plus
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by WA9AFM on May 13, 2008
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Take a look at the TinyTrak 4; it's just out and has KISS capability for two-way ops. Also, any small TNC (KPC-2,3 or 3+) works well for APRS.
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RE: Aprs and TinyTrak3Plus
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by KC0VCU on June 12, 2008
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First, TT3 and TT3+ do not have the hardware necessary to decode packets. All they are using the receive signal for is to determine if there is a packet already being transmitted.
TinyTrak4 and the variation TT4D can do bi-directional packet translation, however there are at least two separate methods of doing that.
In the first method the tracker takes GPS strings and sends them, then decodes strings from the radio and puts waypoints on an attached GPS that supports them. This has worked for me with an eTrex Venture, but it won't be of any use for USB based GPS receivers (think TomTom, Garmin Nuvi, etc.) or pretty much by definition GPS Pucks.
The KISS TNC mode (a different firmware software that needs to be put on the TT4) simply converts packets heard over the radio into packets on a serial port, and vice versa. You will need a computer and software that decodes those packets. That software should also provide the features needed to transmit packets as well. It spits them out the serial port and the TT4 then sends the audio tones and ptt switch (as needed) to the radio. This can be used to send APRS positions, but the TT4 will not be converting position reports to packets, the software on the computer will need to do that.
A variation on this is to use software on the computer to map position information from a GPS receiver (you could even use bluetooth or usb connected receivers) and have it spit NEMA strings to the TT4. It then has to be able to accept position reports as 'waypoints' from the TT4 and could display them for you that way.
The TT4D ads a display to the TT4 (though there isn't a housing for that yet) and you can use that to receive packets and display position reports. There is the possibility of adding a keyboard to the setup, but I don't know if Byon has in mind a 4 to 16 button keypad or a full blown qwerty keyboard. Depending on what gets built into the setup, 'up'/'down'/'select'/'send' may be all you need.
I understand that some of the new OpenTrak products are doing some of the same things.
73,
~Rusty - kc0vcu
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