[aprssig] aprssig Digest, Vol 54, Issue 20

Thu Dec 18 12:07:13 EST 2008

thers an aprs decoder only board being sold on ebay
here's the link for it its only 20 bucks.
or go to ebay and search for aprs, there's a decode (receive only board) and a
encode (transmit only board.)

http://cgi.ebay.com/APRS-Decoder-Ham-Radio_W0QQitemZ330294692581QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item330294692581&_trksid=p3286.c0.m14&_trkparms=72%3A1234|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A0|293%3A1|294%3A50

73 de ke6anm

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> Today's Topics:
> 
>    1. Field station (Andrew Rich)
>    2. Re: Sub-second timeslots (Scott Miller)
>    3. Re: Field station (Tyler)
>    4. Re: Field station (kai.brandt at hjemme.no)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 18 Dec 2008 07:40:07 +1000
> From: "Andrew Rich" <vk4tec at tech-software.net>
> Subject: [aprssig] Field station
> To: "TAPR APRS Mailing List" <aprssig at tapr.org>
> Message-ID: <00d101c96090$0878ee70$6501a8c0 at Laptop1520>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Hello
> 
> What is the cheapest way to have a receive only station, with plain text ?
> 
> I want field units to send packets and a LINUX computer pick them up off
> serial.
> 
> Then add to mysql table and web front end 
> 
> Andrew VK4TEC
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> ------------------------------
> 
> Message: 2
> Date: Wed, 17 Dec 2008 13:53:19 -0800
> From: Scott Miller <scott at opentrac.org>
> Subject: Re: [aprssig] Sub-second timeslots
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <494974CF.7080404 at opentrac.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> I had another firmware update due anyway, so I added the half-second 
> slotting to the new release and it's available for download now.  I'd 
> still consider this feature experimental, though.  If you get the new 
> otwincfg program, you can add .5 to the slot number to transmit in the 
> second half of the second.  Just remember to set 'quiet time' to zero or 
> it'll still hold off if the channel is busy.
> 
> http://argentdata.com/support/otplus.html
> 
> Scott
> N1VG
> 
> Bob Bruninga wrote:
> > Scott,
> > good idea.  I wonder if the RMC is consistent across multiple GPS vendors?
> > 
> > But I like the idea of a spec to outline the concepts of time-slotting. 
> But it would be nice to test with at least one WIDEn-N path so that this
> technique coiuld be used through cross-band digipeaters.  I think having at
> least one hop should be conisdered a requirement.
> > 
> > So it is good you are testing higher rates..
> > 
> > Bob, WB4APR
> > 
> > 
> > ---- Original message ----
> >>Date: Tue, 16 Dec 2008 10:03:13 -0800
> >>From: Scott Miller <scott at opentrac.org>  
> >>Subject: [aprssig] Sub-second timeslots  
> >>To: "aprssig at tapr.org >> TAPR APRS Mailing List" <aprssig at tapr.org>
> >>
> >>I announced on the OpenTracker list yesterday that I'd had some success
> >>in improving the OpenTracker's time synchronization.  With my test
> >>firmware, as long as GPRMC is transmitted by the GPS receiver at the top
> >>of the second, synchronization seems to be within about 40 ms even
> >>without a 1-pps signal.
> >>
> >>Yesterday I had two trackers running in adjacent 1-second time slots
> >>without interference, which was something it couldn't reliably do
> >>before.  Today, I've made an experimental modification to select the top
> >>or bottom of the second for the time slot, and I've got two trackers
> >>sending without collisions in a 1-second span.
> >>
> >>Here's an audio capture of the two trackers:  http://n1vg.net/2packets.wav
> >>
> >>They both finish in about .9 seconds, with .12 seconds of dead air
> >>between them.  They're running Base91 compressed mode (including
> >>course/speed) with no comment and no path.  Obviously you're not going
> >>to have time to digipeat packets on the same channel if you're running
> >>half-second time slots, so the lack of a path doesn't make much
> difference.
> >>
> >>This should be good for special events and such - you can get 10
> >>trackers on a channel with a 5-second update cycle.  There's more
> >>testing to be done (I'd like to fill several adjacent slots and do a
> >>long-term test) but the results so far are encouraging, and it's working
> >>with cheap HTs, not commercial mobiles with fast TX/RX switching.
> >>
> >>It'd also be nice to establish some sort of actual specification for all
> >>this.  I don't think anyone's ever made any effort to make sure that
> >>time slot implementations are compatible between vendors.  This really
> >>needs a clearly defined spec and some interoperability testing.
> >>
> >>Scott
> >>N1VG
> >>
> >>
> >>
> >>_______________________________________________
> >>aprssig mailing list
> >>aprssig at tapr.org
> >>https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> > 
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> > 
> 
> 
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Wed, 17 Dec 2008 16:19:43 -0700
> From: Tyler <n7uwx at comcast.net>
> Subject: Re: [aprssig] Field station
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <EC074047-FC70-4E55-9E9E-3E6806ED9D06 at comcast.net>
> Content-Type: text/plain; charset="us-ascii"
> 
> What about a sound card TNC?
> 
> Tyler
> Sent from my iPhone
> 
> On Dec 17, 2008, at 2:40 PM, "Andrew Rich" <vk4tec at tech-software.net>  
> wrote:
> 
> > Hello
> >
> > What is the cheapest way to have a receive only station, with plain  
> > text ?
> >
> > I want field units to send packets and a LINUX computer pick them up  
> > off serial.
> >
> > Then add to mysql table and web front end
> >
> > Andrew VK4TEC
> > _______________________________________________
> > aprssig mailing list
> > aprssig at tapr.org
> > https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
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> ------------------------------
> 
> Message: 4
> Date: Thu, 18 Dec 2008 12:27:48 +0100 (CET)
> From: kai.brandt at hjemme.no
> Subject: Re: [aprssig] Field station
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Cc: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <722691.3091229599668763.JavaMail.root at mail.hjemme.no>
> Content-Type: text/plain; charset=utf-8
> 
> 
> If you have a soundcard try a debian distro with "soundmodem".
> This can be used with javaaprssrv and i.e MySQL
> 
> You could also pipe the data from soundmodem to an sql server with very
> little work.
> 
> Kai Gunter
> LA3QMA
> 
> 
> 
> 
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> End of aprssig Digest, Vol 54, Issue 20
> ***************************************
> 