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[aprssig] ALOHA Circle on findU and/or APRSWorld

Brian B. Riley User brianbr at mac.com
Tue Nov 2 15:34:56 UTC 2004


In this same vein, I have been meaning to ask this for quite awhile, In the
current configuration is there some way to ask it to list the "x" number of
digipeaters  to a given station or location????? I know we can ask for a
list of weather stations, and I do realize that many, say, weather stations,
are also digis, but is there some way to display just the stations that
display the green star icon?

Cheers ... n1bq

On 10/31/04 10:03 PM, "Steve Dimse" <k4hg at tapr.org> wrote:

> On 10/31/04 at 8:52 PM Christensen, Eric <CHRISTENSENE at MAIL.ECU.EDU> sent:
> 
>> Is it possible to view the 40 closest stations that are on RF (i.e. no
>> Winlink, CW, or just IS stations) listed?  That way people could tell what
>> kind of path to use if they weren't using APRSdos?  I like the way findU
>> shows the closest stations but it shows both IS and RF stations. Maybe it
>> could be done using the Q-construct or the presence of an I-Gate in the path?
>> Not sure if it can be done with the current code.
>> 
> Not with findU's current code, and furthermore this is much harder to do than
> it appears at first glance. Positions arrive at findU by many different
> routes, there is no single test you could perform on a packet to tell which
> originated on RF, so the code would be complex, and in a few cases it may not
> be possible at all. Worse is the problem of IGates and others on both RF and
> INet...in most cases client programs transmit on both RF and INet at the same
> time, so the INet packet is the one that makes it onto the APRS-IS and
> therefore findU. These would be eliminated from the list, even though they
> appear on RF.
> 
> I don't believe it is possible to generate the info you ask for reliably with
> findU. The reason is the same one I always give whenever a propagation
> question is posed for findU and the APRS-IS. These systems were designed to
> transport the data; the dup-checking and other characteristics of the system
> preclude their being used for any propagation studies.






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