Bruce,

That would be cool, an HT that tells you where the bird is!

Sign Me Up! Joe kk0sd

-----Original Message----- From: Bruce Robertson [mailto:ve9qrp@gmail.com] Sent: Monday, July 26, 2010 7:23 AM To: Gary Joe Mayfield Subject: Re: [amsat-bb] Re: video: program to burn TLEs onto doppler-tuning microcontroller

Thanks, Joe --

I guess an important distinction is that the trakbox did rotor control, and my project doesn't. Rather, it aims to be useful to a person in the field using hand-held equipment. In fact, ultimately, I'd like to see code like this built into the firmware of an HT like the TH-D7A.

73, Bruce VE9QRP

On Mon, Jul 26, 2010 at 12:45 AM, Gary "Joe" Mayfield gary_mayfield@hotmail.com wrote:

Cool!  Trakbox lives again!!!

73, Joe kk0sd

-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Bruce Robertson Sent: Sunday, July 25, 2010 8:51 PM To: AMSAT-BB Subject: [amsat-bb] video: program to burn TLEs onto doppler-tuning microcontroller

Some of you know about my qrptracker project, which is aiming at a compact, microcontroller-based doppler tuning device for use in the field. My previous videos showed an FT-817 controlled by this device and using a small speaker and CW to announce the bird. I've just posted a video to YouTube at http://www.youtube.com/user/VE9QRP that demonstrates the program that is used to load TLEs into the microcontroller, sync the tracker, etc. It also shows the microcontroller tuning a TH-D7A handheld, and it shows a LCD display. My goal now is to make an altoids-tin-sized package that connects to a TH-D7A or an FT-817, has an LCD display and provides doppler tuning.

In further developments in this project,  I've worked on porting the SGP4 algorithm to the ATMega644p. (Currently the project uses the Plan13 algorithm.)It's not an exact port, since the 'double' data type is not the same length, but with some careful hand-crafting, we're getting accuracies down to 1/10th of a degree lat and long. sub-satellite point.

73, Bruce VE9QRP

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