[aprssig] Interesting Findings - 300 Baud AX.25 on VHF-FM APRS

John Wiseman john.wiseman at cantab.net
Sun Apr 3 03:43:54 CDT 2016


Unfortunately DireWolf doesn't implement the UZ7HO FEC mode.

I did start trying to implement his FEC mode in C so it could run on a PI or
one of the modern cheap but powerful embedded devices (eg the Nucleo
F446RE), but didn't get very far. I haven't given up, but other projects are
getting in the way!

73,
John G8BPQ


-----Original Message-----
From: aprssig [mailto:aprssig-bounces at tapr.org] On Behalf Of Bill via
aprssig
Sent: 03 April 2016 06:12
To: Stephen H. Smith; aprssig at tapr.org
Subject: Re: [aprssig] Interesting Findings - 300 Baud AX.25 on VHF-FM APRS


Use a RPI with DireWolf software and a 5$ USB sound fob.  No waterfall but
otherwise equivalent.   I've heard uz7ho runs on Linux under WINE but that
would probably require an Intel CPU.

With these options available now, it's interesting to consider just which
alternate modes we should try.   

Bill, WA7NWP

> On Apr 2, 2016, at 6:27 PM, Stephen H. Smith <wa8lmf2 at aol.com> wrote:
> 
>> On 4/2/2016 6:15 PM, Bill Vodall wrote:
>> On Sat, Apr 2, 2016 at 2:22 PM, Stephen H. Smith via aprssig
>> <aprssig at tapr.org> wrote:
>> 
>>> 
>>> What I could really use is a tiny single board computer ala Raspberry Pi
>>> that can run normal Intel x86 OSes and software. There are tools that
can
>>> remove a lot of the fluff from Windows 2000 or XP so that the barebones
OS
>>> kernel and an application can fit into less than 400 MB of flash.   With
>>> such a setup, it would be trivial to use the UZ7HO Soundmodem advanced
modes
>>> in a dedicated tracker.
>> 
>> Won't one of the $70 win tablets work for this?
>> 
> 
> That's what I am using now.  The cheap tablets are wonderful building
blocks that let you use off-the-shelf standard Windows apps, but I was
thinking of something even smaller and lower power.
> 
> As I said, something akin to a Ras Pi.     For tracker, digipeater, igate
applications, etc the device doesn't need a display once it's setup.
Without a display, the power consumption and physical size could easily be
cut in half.
> 
> _________________________________________________
> Stephen H. Smith    wa8lmf (at) aol.com
> Skype:        WA8LMF
> EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
> Home Page:          http://wa8lmf.net
> 
> _______ Windows 10 Outrages! _______
>   <http://WA8LMF.net/Windows10_Info>
> 
> Live Off-The-Air APRS Activity Maps
>   <http://wa8lmf.net/map>
> 
> Long-Range APRS on 30 Meters HF
>   <http://wa8lmf.net/aprs/HF_APRS_Notes.htm>
> 
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