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ZL3AI > APRDIG 22.02.04 12:40l 252 Lines 9628 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Feb 20, 2/4
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: The Dummy is STUMPED
From: "Sadowski, Allan" <allan.sadowski@ncshp.org>
Date: Fri, 20 Feb 2004 11:38:09 -0500
X-Message-Number: 8
OK... I have a coordinate set I pulled from a GPS. It's a list of
Lat/Lon in ASCII... WGS84 was the datum.
It's a lake... so it defines a polygon.
SO... HOW DO I MAKE MY OWN MAP from this... that I can view with the
greatest number of APRS applications?
I'm going nuts trying different approaches... I just want a map file as a
result... I'm going to "GIVE" it to Steve for anyone to use however they
want to use...
I don't want to give the coordinates to someone to do it for me... as
ultimately I'll be making some other maps from real live GPS data... and I
DO NOT want to be constrained down the road with the number of coordinates
(like DOSAprs forces on you... I'd like to keep the vertex list as
complicated as I want)....
Thanks in advance...
ALOHA
AH6LS
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Subject: RE: UHF APRS frequency
From: "Robert Bruninga" <bruninga@usna.edu>
Date: Fri, 20 Feb 2004 11:51:04 -0500
X-Message-Number: 9
APRS UHF voice channel 445.925 MHz.
Every now and then this issue comes up. Again, there is no driving force
requiring a dedicated APRS UHF frequency since most links and backbones
will be dedicated and will need their own local coordinated frequency to
eliminate QRM.
But we DO often need a common APRS voice coordination channel, hence the
445.925 frequency was chosen from one of the standard ARRL simplex
frequenceis (though many areas have different band plans).
So whenever you need an APRS "voice" channel, think of that one. AND also
always think in terms of using the APRS PL tone of 100 (in the USA). That
way, we will have a way of talking while also letting some APRS data move
when the channel is not otherwise in use.
So next time you go to a frequency coordination meeting, rememebr to
suggest that 445.925 PL 100 be "listed" as an APRS auxilliary VOICE
channel...
Thanks to VE3LT for reading my old UHF.TXT file and reminding me of this.
Ill update my old UHF.TXT file in the next release..
de WB4APR, Bob
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Subject: Re: The Dummy is STUMPED
From: "Scott Miller" <scott@opentrac.org>
Date: Fri, 20 Feb 2004 08:51:23 -0800
X-Message-Number: 10
How many APRS maps support shapefiles? Or maybe a better question is why
would they support APRSDOS format maps and not shapefiles? I don't think
anyone outside of APRS uses APRSDOS maps... shapefiles on the other hand are
widely used in GIS and there are plenty of tools for manipulating them.
I've done what you're talking about, but only in ArcView. There's a Garmin
extension for ArcView that'll let you download tracks from a Garmin GPS as a
shapefile layer. It's a lot easier to do with a Trimble unit that's got
real data entry capability. I mapped a local park with one of those... you
just hit the polygon button, enter a label, and start walking. That
particular unit was about $12,000 though.
I'm sure there are cheaper ways to get this done. Of course, most lakes and
things have been mapped already thanks to your tax dollars...
Scott
N1VG
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Subject: Re: The Dummy is STUMPED
From: Steve Dimse <k4hg@tapr.org>
Date: Fri, 20 Feb 2004 12:03:46 -0500
X-Message-Number: 11
On 2/20/04 at 11:38 AM Sadowski, Allan <allan.sadowski@ncshp.org> sent:
>OK... I have a coordinate set I pulled from a GPS. It's a list of
>Lat/Lon in ASCII... WGS84 was the datum.
>
>It's a lake... so it defines a polygon.
>
>SO... HOW DO I MAKE MY OWN MAP from this... that I can view with the
>greatest number of APRS applications?
>
>I'm going nuts trying different approaches... I just want a map file as
>a result... I'm going to "GIVE" it to Steve for anyone to use however
>they want to use...
>
>I don't want to give the coordinates to someone to do it for me... as
>ultimately I'll be making some other maps from real live GPS data... and
>I DO NOT want to be constrained down the road with the number of
>coordinates (like DOSAprs forces on you... I'd like to keep the vertex
>list as complicated as I want)....
APRSods will do this up to about 3000 points. Note that that is a
limitation in his program, AFAIK other programs do not obey that limit,
certainly the present APRSdos code on findU can draw as many points as you
want. I seem to recall a Basic tool Bob wrote to make a map out of points,
I'm sure he'll be able to elaborate.
PocketAPRS would probably be my next choice, but in this case you have
forsaken the APRSdos users anyway, so I don't think you will gain much over
a longer APRSdos map, and you will lose the map conversion tool.
Of course, you could make two versions of the map, one omitting every nth
point to fit withing APRSdos's limitation.
Steve K4HG
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Subject: TCP/IP operation - NOT
From: Glenn Wiebe <gswiebe@mb.sympatico.ca>
Date: Fri, 20 Feb 2004 11:09:32 -0600
X-Message-Number: 12
I have now decided that TCP/IP having never worked for me will never
work for me using WinAPRS. While I never really intended to use it, it
always bugged me that I couldn't. I'm not prepared to fight with it any
longer and as far as I'm concerned it doesn't exist here. Thanks to all
those who offered helpful suggestions.
73 de Glenn...VE4GN
I wrote:
>I've been using WinAprs (registered, now 2.7.2) for many years and the
>only ports as listed under Settings>TCP/IP Connections I've ever been
>able to open are: 1) Secondary APRS Net Server 2) second.aprs.net 10151
>APRServe - backup: (I suspect they are the same) 3) 204.118.115.12 23
>west usa:. The first two rapidly fill the screen with world wide
>stations and the last one does nothing. All the rest - and there are
>dozens including a local feed that others can open - come up with: TCP
>Open Failed. Yes I am on line. Any suggestions?
----------------------------------------------------------------------
Subject: Re: The Dummy is STUMPED
From: "Robert Bruninga" <bruninga@usna.edu>
Date: Fri, 20 Feb 2004 12:11:09 -0500
X-Message-Number: 13
>>>"Sadowski, Allan" wrote:
>OK... I have a coordinate set I pulled from a GPS. It's a list of
>Lat/Lon in ASCII... WGS84 was the datum.
>SO... HOW DO I MAKE MY OWN MAP from this...
>that I can view with the greatest number of APRS applications?
Although you said you dont want to use APRSdos because of the map point
limit of 3000 points, you can still use the APRSdos map tools to work with
maps up to about 10,000 points or more...
Just run MAPFIX40.exe, tell it the coordinates for the upper left origin of
the map and the approximate Range Scale and then do a TASK-GPS and give it
the name of the file.
THen you will have a blank map with all the GPS points on it.
Now, use your MOUSE to draw the map anyway you want.
Most of the time, many GPS fixes are in a row and there is no need to waste
points with them... Also unless you have CORNER PEGGING, the GPS data wont
give you good intersections. That is why I let the OPERATOR draw the map
over the GPS data, rather than just taking it as is.
The human cna do much better at making the map usable than just a bunch of
dots...
Also, you can concatonate many maps of up to 10,000 points each. And
alghough APRSdos can't handle it. THe format is still valid and WinAPRS or
any other program that can render APRSdos maps can still draw it. (APRSdos
has a limit becuse it keeps the last 3 maps used in RAM so that on old SLOW
8186 PC's you dont have to wait for a disk access on each ZOOM)...
de WB4APR, bob
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Subject: eTREX to THD7
From: "Sadowski, Allan" <allan.sadowski@ncshp.org>
Date: Fri, 20 Feb 2004 12:28:46 -0500
X-Message-Number: 14
OK... my lunch hour is full of "messing about" today.
I just hooked an old eTrex to a THD7 - and no workee workee...
I then looked at the signals on the connector. The eTrex levels on the
scope are a digital waveform about .25V positive to about 1.7V
negative... when the eTrex is sending NMEA data.
Maybe this has been gone over in the past here on the SIG... do you have
to run the eTrex to a level converter for the THD7 ? This is using the
Garmin cable to a homemade adapter so that I could solder to the
flexible cable that comes with the THD7. This is when the Cable is NOT
connected to the radio... straight out of the Garmin cable shows the
same values as at the mini phono plug... kind of low RS232 signals..
so wondering if the radio needs more than that in voltages...
The Kenwood manual makes no mention of what the signal levels need to
be...
ALOHA
AH6LS
----------------------------------------------------------------------
Subject: Re: The Dummy is STUMPED
From: Mark Sproul <msproul@jove.rutgers.edu>
Date: Fri, 20 Feb 2004 12:21:11 -0500
X-Message-Number: 15
Allan
WinAPRS has the ability to take a GPS track file in NEMA format, put it in
a foloder called LABELS and it will be drawn as an outline on all maps.
Mark
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Mark Sproul |
http://ecs.rutgers.edu |
msproul@jove.rutgers.edu |
Manager - Engineering Computing Services | 732-445-3121
Rutgers University School of Engineering |
Office: Eng D111 |
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