[OZAPRS] APRS problem

[Richard Hoskin]

Gday Ray,

You could try http://health.groups.yahoo.com/group/SAR_APRS/ for some of
your questions. They may be able to help.

A lot of what you are asking appears to be map resolution and RF related.

You might like to take a look at Xastir as an application as they clam to
have SAR options in the application. Also AGWTracker may be of interest as
it can import, scale and layer UI-View maps.

As for RF you could try using a ground independent 1/2 wave on the
trackers
back pack to get better coverage. And as suggested place the Digipeater in
a
more appropriate location.

Cheers
Richard
VK3JFK


> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
> Behalf Of Ray Wells
> Sent: Wednesday, 19 September 2007 11:58 AM
> To: VK / ZL APRS Users
> Subject: [OZAPRS] APRS problem
> 
> Hi All,
> 
> Kim VK2ASY asked me to submit this to the list while he sorts out his
> subscription.
> 
> Ray vk2tv
> 
> Hi All,
> 
> I have been involved with a number of searches in recent times around
> the Orange and Oberon areas, and have felt the frustration of inadequate
> live information on progress of search operations and the difficulties
> this presents in search planning and execution. The timeliness required
> if there is a potentially live lost person who may be moving, or the
> difficulties presented with very difficult terrain, or both present
> significant problems!!
> 
> I am in the early stages of putting together a small system with
> assistance from others locally to assist the local SES with searches, as
> I feel this technology can greatly assist with search planning and
> execution, and give AR in the area a bit of a boost in profile and
> involvement.
> 
> I gave it the first field run yesterday with a support operation and
> came up with a few issues.
> 
> Yesterday, I had Pete vk2blo carry the "tracker", (Kenwood D7 HH and
> Button GPS) a few problems with radio coverage, running on 1 watt, in
> heavy forest area, below cliff lines, I have logged about 40% of
> Transmitted packets .So do have to look at the RF setup.. getting the
> portable antenna up clear, without getting in the way, and possibly
> using a higher gain than the standard fitted antenna..
> 
> Base control antenna was up about 3 meters ground independent mobile,
> and Kenwood D700 .. data rate set at 1200. running about 10 watts.. had
> some thoughts of adding a small beam into the mix as the control point
> was on one side of the search and every thing was confined in a steep
> valley..
> 
> Then came the display of the data, I got variable results with the
> display of data on OziExplorer, from UIView and OziAPRS, taking data off
> air. The received data that was clear enough displayed on the map ok,
> but could not get the base to show on the map constently..
> 
> I like the Oziexplorer display and accuracy but the results in this
> configuration is very "clunky"... I thought of clipped maps directly in
> UIView but the accuracy of the trials I have run is not good enough,
> where as Oziexplorer locations are accurate on the maps. Voice
> confirmation of location at topographic features supports the APRS
> location..
> 
> Any suggestions on any of the issues, configuration setting,
> alternatives etc.. would be greatly appreciated..
> 
> Kim Stevens ESM (VK2ASY)
> 
> Local Controller
> 
> Orange City SES
> 
> orange.ses.ops at bigpond.com
> 
> http://orange.ses.nsw.gov.au
> 
> 
> SES (02) 6362 8785 - Fax (02) 6362 6670
> 
> Work (02) 63638104 - Mob 0427076695
> _______________________________________________
> Ozaprs mailing list
> Ozaprs at aprs.net.au
> http://aprs.net.au/mailman/listinfo/ozaprs

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