[amsat-bb] Re: video: program to burn TLEs onto doppler-tuning microcontroller

Gary "Joe" Mayfield gary_mayfield at hotmail.com
Mon Jul 26 19:43:54 PDT 2010


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 at 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 at hotmail.com> wrote:
> Cool!  Trakbox lives again!!!
 >
> 73,
> Joe kk0sd
>
> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at 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
>
> --
> http://ve9qrp.blogspot.com
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-- 
http://ve9qrp.blogspot.com




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