<div dir="ltr">Even just Argent offers several prebuilt solutions for <$50.<div><br></div><div>* Tracker3 Mini, $34 each for a dozen of them: <a href="https://www.argentdata.com/catalog/product_info.php?products_id=167">https://www.argentdata.com/catalog/product_info.php?products_id=167</a></div><div>* The Radio shield, $22 each at dozen quantity: <a href="https://www.argentdata.com/catalog/product_info.php?products_id=136">https://www.argentdata.com/catalog/product_info.php?products_id=136</a></div><div><br></div><div>Which leave another ~$20 for a TTL GPS receiver, which is not problem on eBay. If you want that to be turn key as well, the T3-Micro comes with the GPS integrated for $65:</div><div><a href="https://www.argentdata.com/catalog/product_info.php?products_id=170">https://www.argentdata.com/catalog/product_info.php?products_id=170</a><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature">--<br>Kenneth Finnegan<br><a href="http://blog.thelifeofkenneth.com/" target="_blank">http://blog.thelifeofkenneth.com/</a></div></div>
<br><div class="gmail_quote">On Fri, Oct 14, 2016 at 5:22 AM, John Gorkos <span dir="ltr"><<a href="mailto:jgorkos@gmail.com" target="_blank">jgorkos@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">You're probably not going to find a built solution for $50. There's<br>
just no margin in building small runs of APRS devices, and very little<br>
market for large runs.<br>
<br>
Your best bet would be a custom board built for task. If you're going<br>
to build a dozen of them, you can get enough discount on parts to do<br>
them for <$50 each.<br>
<br>
I would start here:<br>
<a href="http://garydion.com/projects/whereavr/" rel="noreferrer" target="_blank">http://garydion.com/projects/<wbr>whereavr/</a><br>
<br>
That's a basic AFSK modem that encodes using a resistor ladder and<br>
decodes using a basic interrupt-driven zero-crossing decoder. It speaks<br>
KISS, but a smart guy would port this to a Teensy with its vastly<br>
greater processing power, and write a simple interface around it. It<br>
takes NMEA from an external serial port. You didn't mention anything<br>
about a GPS module. EBay is full of Ublox Neo 6M modules for under $10.<br>
The Teensy is $20 from LadyAda. You'd probably want to spin a custom<br>
"shield" board to mount to the Teensy, where you can mount some screw<br>
terminals or a 3.5mm phono jack, your resistor ladder, your voltage<br>
divider for the receive side, some LEDs, etc. In quantity 12, you can<br>
get a dozen double sided boards made for <$100, so board cost is under<br>
$9. The misc parts would probably fill out the remaining $11. The cool<br>
part is the Teensy has a very nice voltage regulator built in, since it<br>
likes to be fed from a USB port.<br>
<br>
Of course, I'm assuming your time is free. The software is going to<br>
take time. The basic transmitter and receiver code can be borrowed from<br>
Gary Dion's project, but if you want a KPC-2-style interface, that's<br>
going to take time. Assembly is going to take time. Assembly and final<br>
programming would be a great club project, since you could do it all<br>
with through-hole components.<br>
<br>
Just some thoughts.<br>
John Gorkos<br>
<span class=""><br>
On 10/14/16 1:54 AM, Jim (List) wrote:<br>
> Thanks, but that’s way out the price range.<br>
><br>
><br>
><br>
> I’m looking at a built solution (without radio) for about $50.<br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> Jim<br>
><br>
><br>
><br>
><br>
><br>
</span>> *From:*Robert Bruninga [mailto:<a href="mailto:bruninga@usna.edu">bruninga@usna.edu</a>]<br>
> *Sent:* 13 October 2016 22:56<br>
> *To:* Jim (List)<br>
> *Subject:* RE: [aprssig] Simple APRS module to use with Arduino<br>
<span class="">><br>
><br>
><br>
> Sure, the Byonics.com Mircotrack MTT4B and it includes a 10W transmitter.<br>
><br>
> bob<br>
><br>
><br>
><br>
</span>> *From:*aprssig [mailto:<a href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.<wbr>org</a><br>
> <mailto:<a href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.<wbr>org</a>>] *On Behalf Of *Jim (List)<br>
> *Sent:* Thursday, October 13, 2016 2:49 PM<br>
> *To:* TAPR APRS Mailing List<br>
> *Subject:* [aprssig] Simple APRS module to use with Arduino<br>
<span class="im HOEnZb">><br>
><br>
><br>
> I’m looking for an APRS add-on module to use with Arduino, providing<br>
> simple TX and RX of APRS beacons.<br>
><br>
><br>
><br>
> It will primarily be sending messages, but ability to also receive would<br>
> be useful so it can get the message ack.<br>
><br>
><br>
><br>
> Cost is a factor as, if the project is successful, I’ll be looking to<br>
> build about a dozen units.<br>
><br>
><br>
><br>
> I’m aware of the Argent Data Shield, wondering if there is anything else<br>
> out there.<br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
> Jim, G1HUL<br>
><br>
><br>
><br>
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><br>
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