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[aprssig] Re: APRS for a near-Arctic hot-air balloon flight -- TinyTralk and OpenTrak 300 baud mode

Ryan Butler rbutler at tsss.org
Wed Dec 7 01:42:49 UTC 2005


Scott,

Is there a possibility of a Manchester encoded FSK firmware for use 
with digipeating satellites like AO-16?

Ryan, KB0JQO


Quoting scott at opentrac.org:

>> The OpenTrack requires downloading an entirely different set
>> of firmware into the processor; i.e. not something you will
>> do in the field.
>
> That's true.  If there's sufficient interest, I could change that.  It's
> just a few constants that get changed, but the loop that references them is
> very timing critical and I didn't feel like messing with it and using up
> more config space.
>
> I actually cranked it up to 2400 baud once, but couldn't get AGWPE to copy
> it.  Not sure if that was because it wasn't modulating properly, or if I
> didn't have the right tones - I think George wasn't even sure what tones it
> needed, or if it had been tested.
>
> I'm thinking about trying out 600 baud, with convolutional coding and a
> non-AX.25 frame format... just curious how much the performance can be
> improved for a noisy channel.
>
> Scott
> N1VG
>
>
>
>
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