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ZL3AI > APRDIG 07.01.07 11:41l 263 Lines 9269 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 31 #5, 1/2
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Today's Topics:
1. RE: Help with Interfacing a GPSto Kantronics KPC-3 (Robert Bruninga)
2. Xastir or WinAPRS questions (M J)
3. Re: Xastir or WinAPRS questions (Jason Winningham)
4. Re: Xastir or WinAPRS questions (Curt, WE7U)
5. Re: Xastir or WinAPRS questions (Mark Sproul)
6. Re: Xastir or WinAPRS questions (J. Lance Cotton)
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Message: 1
Date: Thu, 4 Jan 2007 15:43:07 -0500
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: RE: [aprssig] Help with Interfacing a GPSto Kantronics KPC-3
>>>>Subject: RE: [aprssig] Help with Interfacing a GPS to Kantronics KPC-3
>I think this is really my main objection to the proportional
>pathing scheme. Even up the coast here, you don't need more
>than 2 hops to get all over. There's really not much benefit
>unless you want to be seen in Arizona.
I think you missunderstand. Proportional pathing works perfectly well for
two hops. And reduces packets on the channel by a factor of 10, and
overall channel loading by at least a factor of 5 even in a 2 hop area.
>And users who don't understand it are probably more likely to
>crank their rate up higher when they don't see their packets
>getting in as often as they expect.
I doubt it. Why would they set porportional pathing if they did not want
to take advantage of it? The advantage to them is higher local rates and
lower DX rates an dlwer QRM for everyone.
>>>The transmitting of raw NMEA strings over the air...
>>>is highly discouraged in California. Raw NMEA
>>>occupy up to TEN times more air time than the
>>>most compact encoding format for APRS (Mic-E).
>>
>>A little caution and explanation with that advice...
>>
>>1) True, it is 10 times longer, but when you include the packet
>>overhead this is more like only a factor of 2 longer.
>>
>>2) The KPC-3+ TNC tracker that sends raw NMEA can actually
>>produce less QRM, because it can be set to PROPORTIONAL PATHING.
>>
>This accomplishes nothing in Southern California where
>all the digipeaters enforce SINGLE HOP no matter what path is
>set into the tracker. All you are doing is transmitting
>longer packets...
You are correct in this case. I agree. NMEA trackers are less efficient in
an area such as the LA basin, where only 1 hop packets are allowed.
Bob, WB4APR
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Message: 2
Date: Fri, 5 Jan 2007 03:02:06 -0800 (PST)
From: M J <mjandthegang_at_yahoo.com>
Subject: [aprssig] Xastir or WinAPRS questions
Hello,
While working on a college project, I ran across APRS and have been
watching the list for a while. I was wondering about a couple of
particular features and wondered if someone would be nice enough to help me
to know if either Xastir or WinAPRS has them?
Three items I'm interested in:
I would like to double-click on the symbol for a weather station and have a
dashboard popup, displaying the weather data graphically.
Same item for moving objects (but about the ability to see a dashboard of
their GPS reported data).
As a followup to that from a recent thread, I understand that both encoded
and raw NMEA data can exist on the APRS network. Is raw NMEA decoded and
treated like encoded data in these programs?
Would anyone be kind enough to tell me if Xastir and WinAPRS have the
abilities that I'm looking for (as a receive-only station as I am not able
to transmit on RF).
Thank you!
MJ
PS: Since I'm receive only, I'm wondering if maybe someone has developed a
web-page that I could hit to provide the same information without having to
load software on my computer?
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Message: 3
Date: Fri, 5 Jan 2007 06:41:07 -0600
From: Jason Winningham <jdw_at_eng.uah.edu>
Subject: Re: [aprssig] Xastir or WinAPRS questions
On Jan 5, 2007, at 5:02 AM, M J wrote:
>I would like to double-click on the symbol for a weather station
>and have a dashboard popup, displaying the weather data graphically.
I'm an xastir user, so I'll try to give a partial answer.
xastir doesn't have the sort of popup you're talking about. You can
request information of a station and get it (textually) in a dialog box.
You can also configure xastir to display weather information as text in a
cluster around the icon on the main display, so data for _all_ stations
would be visible.
>Same item for moving objects (but about the ability to see a
>dashboard of their GPS reported data).
Again, no eye candy, just the facts. Actual lat/long would be reported in
the station information dialog. Information such as speed, heading and
altitude can be displayed adjacent to the icon. The "quick" display of
lat/long is simply the icon's position on the map, no need to clutter the
screen with that.
>As a followup to that from a recent thread, I understand that both
>encoded and raw NMEA data can exist on the APRS network. Is raw
>NMEA decoded and treated like encoded data in these programs?
It's more accurate to say that certain NMEA sentences are valid APRS report
types. You can't just inject NMEA sentences into a port meant for TNC data
and expect anything positive to happen.
xastir (and most any other APRS app) does have the capability to receive
NMEA data so it know where it is, and will generate proper APRS packet
based on NMEA data. It will also allow xastir to correctly calculate
distance and bearing from you to other stations. (Of course, if you're at a
fixed location to can type in your coordinates, or simply drag your station
to the correct spot on the map, without the need for a GPS.)
>PS: Since I'm receive only, I'm wondering if maybe someone has
>developed a web-page that I could hit to provide the same
>information without having to load software on my computer?
www.findu.com has several methods for displaying data that has been gated
to the APRS-IS system. For example, here's my truck:
http://map.findu.com/kg4wsv
Here is a weather station not too far from me, both a map display:
http://www.findu.com/cgi-bin/find.cgi?call=WB4YPW
and a weather data summary:
http://www.findu.com/cgi-bin/wxpage.cgi?call=WB4YPW
Hope this helps.
-Jason
kg4wsv
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Message: 4
Date: Fri, 5 Jan 2007 06:35:47 -0800 (PST)
From: "Curt, WE7U" <archer_at_eskimo.com>
Subject: Re: [aprssig] Xastir or WinAPRS questions
On Fri, 5 Jan 2007, M J wrote:
>While working on a college project, I ran across APRS and have
>been watching the list for a while. I was wondering about a
>couple of particular features and wondered if someone would be
>nice enough to help me to know if either Xastir or WinAPRS has
>them?
Easy answer: Try them! Most APRS programs will let you try them before
you buy, some are free to begin with.
I saw a fairly complete answer w.r.t. Xastir, so I won't duplicate any of
that here. It's what I use as well.
See the below link and click on "APRS Client Capabilities Chart" link on
the left for a very complete list of features across the clients. Go to
the bottom and you'll find links to the homepage for each client to
download.
>PS: Since I'm receive only, I'm wondering if maybe someone has
>developed a web-page that I could hit to provide the same
>information without having to load software on my computer?
Yes.
--
Curt, WE7U. APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
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Message: 5
Date: Fri, 5 Jan 2007 09:47:32 -0500
From: Mark Sproul <kb2ici_at_amsat.org>
Subject: Re: [aprssig] Xastir or WinAPRS questions
MJ
I am the author of WinAPRS, so I can address these questions
At 3:02 AM -0800 1/5/07, M J wrote:
>Hello,
>While working on a college project, I ran across APRS and have been
>watching the list for a while. I was wondering about a couple of
>particular features and wondered if someone would be nice enough to
>help me to know if either Xastir or WinAPRS has them?
>
>Three items I'm interested in:
>
>I would like to double-click on the symbol for a weather station and
>have a dashboard popup, displaying the weather data graphically.
Yes WinAPRS has this capability
>Same item for moving objects (but about the ability to see a
>dashboard of their GPS reported data).
Yes, WinAPRS can do this
>As a followup to that from a recent thread, I understand that both
>encoded and raw NMEA data can exist on the APRS network. Is raw
>NMEA decoded and treated like encoded data in these programs?
there are at least 3 different lat/lon varioations that APRS supports
NMEA
MicE encoded
APRS Posit report, this is a format defined by APRS which is simple
lat/lon human readable
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Mark Sproul |
http://ecs.rutgers.edu |
msproul_at_jove.rutgers.edu |
Manager - Engineering Computing Services | 732-445-3121
Rutgers University School of Engineering |
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