I recently purchased two MT3329 modules for use on an APRS tracker, which I'd like to be able to use for high altitude balloon tracking. I tested one of the modules on the GPS simulator today and found that it cut off serial data at just over 60k feet; indicating that the max altitude/velocity limit is an OR relation (stops working if either is exceeded). Furthermore, the fact that the UART stops sending data as opposed to loses lock is a bit worrying as well, I did not check to see if it came back on after dropping below 60k feet. This could cause issues for applications relying on the GPS as a real-time clock, as I've done in some of my projects. I am wondering if it would be possible for DIYDrones to request a firmware that allows continued use of the GPS over 60k feet (change restriction to AND relation, as it should be).
Tags: 3329, 60k, altitude, feet, gps, high, mediatek, mt3329, restriction
Permalink Reply by Ben on January 13, 2012 at 11:14am I'm hoping to hear an answer on this too. I'm wanting to use the APM to guide a balloon-dropped glider back to the launch point or to a remote touchdown site. Basically high-altitude balloon payload that navigates its way home. So I need an APM that will function at ~100k ft.
Permalink Reply by Robert Striemer on February 2, 2012 at 12:33pm The Garmin 18x works above 60000 feet. We have flow it without issues on two occasions to over 100000 feet. The last flight was to over 126000. There are a few other units that have also been found to work. You will need to search online. There was an amateur radio HAB site that listed units that worked but I no longer have the address and I don't know if its still around or if its been updated.
Hope this helps
Rob
rstriemer AT pembinatrails.ca
Permalink Reply by Ben on February 2, 2012 at 12:37pm Great info, Rob. Thanks. Also, congratulations on your altitude achievement!
-Ben
Permalink Reply by Justin Kenny on February 2, 2012 at 12:49pm Here's a site listing GPS modules that work above 60k feet: http://showcase.netins.net/web/wallio/GPSrcvrsvs60kft.htm
I've used and tested this GPS to work above 60k feet: https://www.argentdata.com/catalog/product_info.php?cPath=23&pr...
I would still very much like to see a high altitude firmware specifically for the MT3329, since it's so small and light (weight is certainly an issue for HAB flights, unless balloon size/money isn't an issue).
- Justin, KJ6KST
Permalink Reply by Anthony Stirk on September 3, 2012 at 5:02am Hi there,
See this post here (at the end)
http://diydrones.com/forum/topics/gps-module-for-high-altitude
The UKHAS regularly fly uBLOX and Lassen modules in excess of 40km.
Cheers,
Anthony
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