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ZL3AI > APRDIG 15.07.03 11:05l 369 Lines 11808 Bytes #999 (0) @ WW
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To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Saturday, July 12, 2003.
1. Info request: Kenwood KGP-1A Modem GPS Receiver
2. APRS Maths Question
3. Balloon Launch today
4. Radar images
5. RE: Radar images
6. RE: Radar images
7. RE: Radar images
8. RE: Radar images
9. Re: Info request: Kenwood KGP-1A Modem GPS Receiver
10. RE: Radar images
11. Re: APRS Maths Question
12. RE: Radar images
13. Re: APRS Maths Question
14. RE: APRS Maths Question
15. New Linear Transponder HELP needed
16. radar
17. RE: Radar images
18. RE: Radar images
19. RE: Radar images
20. Re: APRS Maths Question
21. Re: New EARTHMATE USB with DB9 Serial Cable
22. WINAPRS Registration Turn Around Time?
23. APRS Maths Question (thank you)
24. New Linear Transponder HELP needed
25. New Linear Transponder HELP needed (+1)
26. Re: New Linear Transponder HELP needed
27. Re: New Linear Transponder HELP needed (+1)
28. Re: New Linear Transponder HELP needed
29. RE: Radar images
30. PHGR
31. radar-find
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Subject: Info request: Kenwood KGP-1A Modem GPS Receiver
From: "John Dvoracek" <ke5c@hot.rr.com>
Date: Fri, 11 Jul 2003 23:6:38
X-Message-Number: 1
I've been given a few of these without any information. They are from an
old fleet tracking system. If you have any documentation, please email me.
Thank you!
73, John
ke5c@hot.rr.com
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Subject: APRS Maths Question
From: "Andrew VK4TEC @ Home" <vk4tec@hotmail.com>
Date: Sat, 12 Jul 2003 16:51:52 -0700
X-Message-Number: 2
Gents,
If Have the following info, how would I calculate my ETA ?
1. My position 2734.44S 15306.20E
2. Destination 2734.04S 15306.02E
3. I know my speed from NMEA
QUES :- Does anyone know the conversion between lat/lon to km's ? or even
meters ?
I am assuming that what you do is this:-
Take lat from lat = change in x
Take long from long = change in y
Using a triangle, a^2 + b^2 = c^2 (c being the distance between my position
and the destination)
That would give me the distance to the object, I know my speed and what time
it is now (GPS)
Should I then be able to work out my ETA at my destination ?
Andrew vk4tec
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Subject: Balloon Launch today
From: "Tim Cunningham" <tim_cunningham@mindspring.com>
Date: Sat, 12 Jul 2003 08:24:07 -0500
X-Message-Number: 3
Some students at the University of Alabama - Huntsville will launch a
balloon this morning (July 12, 2003) at approximately 9:30 am. Their goal
is to capture aerial photo's throughout the projected 2 hour flight and to
obtain temperature and pressure sensor measurements via telemetry.
APRS and telemetry data will be transmitted on 144.39 using the call sign
of KG4UWE-15.
The launch will take place at the UAH campus at NSSTC (west side of
building away from Sparkman Drive). If all goes well the balloon should be
launched at 9:30am CDST.
Tim - N8DEU
Huntsville, Alabama
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Subject: Radar images
From: Robbie <mwrobertson@comcast.net>
Date: Sat, 12 Jul 2003 09:06:16 -0500
X-Message-Number: 4
Hi,
Has NOAA changed the gif format? I no longer am able to read the uswxradar
gif files with MS Paint, or display them with Winaprs and UI-View32.
At this moment, I have not tried other readers, but this would really be
something if they changed something because of all the "hits" they take
from aprs users...
I'm not sure what is the problem here yet but wanted to know if anyone else
has problems?
Robbie, wa9inf
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Subject: RE: Radar images
From: "AE5PL Lists" <HamLists@ametx.com>
Date: Sat, 12 Jul 2003 09:18:04 -0500
X-Message-Number: 5
The southern region .gifs are ok. What specific map(s) are you trying to
download? It may be a temporary problem with the specific map you are
trying to download.
As to the number of hits we put on the NWS servers, it is very small. The
NWS radar maps are loaded from their main site and, I would guess, are
downloaded far more from that site than our accesses.
73,
Pete Loveall AE5PL
pete@ae5pl.net
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Subject: RE: Radar images
From: Robbie <mwrobertson@comcast.net>
Date: Sat, 12 Jul 2003 09:33:13 -0500
X-Message-Number: 6
Thanks Pete,
I only tried Chicago and Milwaukee.. I will check them out later and will
try to be patient, :-)
Robbie, wa9inf
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Subject: RE: Radar images
From: "B. Hildebrand" <bhildebrand@earthlink.net>
Date: Sat, 12 Jul 2003 07:52:31 -0700
X-Message-Number: 7
Green Bay, Wis. and Marquette, Mich. are OK. But I can not retrieve Grand
Rapids or Detroit. Western images appear OK. Brent
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Subject: RE: Radar images
From: Steve Dimse <k4hg@tapr.org>
Date: Sat, 12 Jul 2003 10:57:03 -0400
X-Message-Number: 8
On 7/12/03 at 9:33 AM Robbie <mwrobertson@comcast.net> sent:
>I only tried Chicago and Milwaukee.. I will check them out later and
>will try to be patient, :-)
findU is reading the images fine:
https://www1.findu.com/cgi-bin/radar-find.cgi?call=WA9INF
seems unlikely anything changed...
Steve K4HG
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Subject: Re: Info request: Kenwood KGP-1A Modem GPS Receiver
From: "Marvin W. Robertson" <mwrobertson@comcast.net>
Date: Sat, 12 Jul 2003 9:58:15
X-Message-Number: 9
I used Google and got plenty of hits with kenwood kgp-1a modem
You might try that, :-)
Robbie, wa9inf
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Subject: RE: Radar images
From: "AE5PL Lists" <HamLists@ametx.com>
Date: Sat, 12 Jul 2003 10:06:19 -0500
X-Message-Number: 10
I checked the URL's for base and composite reflectivity for Chicago and
Milwaukee. There is a problem with the central region server for
latest.gif in the base reflectivity directory for those radars. The
composite directory is ok as are the individual timestamped gifs in the
base reflectivity directory. Temporary "burps" in the system happen from
time to time. I recommend going to the actual URL to retrieve the gif in a
browser. If the gif is unavailable, you will be sent to a descriptive page
where you can notify the NWS of the problem.
73,
Pete Loveall AE5PL
pete@ae5pl.net
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Subject: Re: APRS Maths Question
From: "Gregg G. Wonderly" <gregg@skymaster.cytetech.com>
Date: Sat, 12 Jul 2003 10:09:01 -0500
X-Message-Number: 11
>Using a triangle, a^2 + b^2 = c^2 (c being the distance between my position
>and the destination)
>Should I then be able to work out my ETA at my destination ?
If you are going to tunnel directly through the planet to that location, yes
:-)
For short distances near the equator, this simple formula is very close. The
right calculation requires polar/spherical math since you are actually
traveling across a curved surface. Here's a URL that has an explanation and
some formulas
http://www.mathforum.com/library/drmath/view/51711.html
-----
gregg@cytetech.com (Cyte Technologies Inc)
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Subject: RE: Radar images
From: Richard Garcia <k4gps@bellsouth.net>
Date: 12 Jul 2003 11:13:20 -0400
X-Message-Number: 12
SE FL Looks OK also
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Subject: Re: APRS Maths Question
From: "Jim" <meyer@myfamily.org>
Date: Sat, 12 Jul 2003 10:16:39 -0500
X-Message-Number: 13
Maybe you could find the math information at this discussion.
http://www.mathforum.com/library/drmath/view/51711.html
Jim, n5zxd
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Subject: RE: APRS Maths Question
From: "Scott Miller" <scott@home.miller.org>
Date: Sat, 12 Jul 2003 08:40:33 -0700
X-Message-Number: 14
That'd work just fine assuming you're on a flat planet. On this one, it's a
little more difficult. Most people just use the Great Circle distance for
such things - it assumes the Earth is a perfect sphere, which it's not, but
I think it'll get you within a fraction of a percent, anyway. See
http://www.argray.org/dist/formula.html for more info. The formula is:
D = 60 * arccos[ sin(Lat1)*sin(Lat2) +
cos(Lat1)*cos(Lat2)*cos(abs(Lon1-Lon2))]
Hope that helps. I've written an implementation in PL/SQL for Oracle, and
there are lots of other code examples on the Web.
Scott
N1VG
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Subject: New Linear Transponder HELP needed
From: Bob Bruninga <bruninga@usna.edu>
Date: Sat, 12 Jul 2003 11:44:04 -0400 (EDT)
X-Message-Number: 15
We have a Sponsored Launch for 2 Cubesats.
Both are intended to support linear transponders.
I need help.
I have been subtle in my requests for help over the last year and have
gotten no response. So today, I have decided to be up front an go public
even though I dont have the time to respond personally to every questin
that will come up. I'm looking for the 1-in-a-thousand who has the
knowledge, time, incentive, background, interest and connections to be
able to contribute.
These satellites are described on
http://www.ew.usna.edu/~bruninga/craft.html
http://www.ew.usna.edu/~bruninga/marscom.html
One is Amateur, One is for MARS (Military Affiliate Radio Stations
(remember, any HAM can join MARS))
Even those pages may not be 100% up to date, but they are the best I have
to offer (im currenlty on deadline for 3 OTHER Amateur Satellites and this
one is next, but I have not even begun!)
I won't have the time to answer ANY questions. Learn what you can from
the pages and decide based on that alone if you can dedicate time and
effort. Here specifically are the individuals we need:
1) Someone with DOD Communiations Experience that can do all the Frequency
paperwork.
2) Someone within the MARS organization that can work the politics up and
down and all around and totally work that side of the equation. Getting
MARS into space is essential for its long term viability.
3) Someone to BUILD the linear transponders. Leave it up to me and in my
limited time all I will have time to do is modify two back-to-back PSK 10m
transceivers (a kludge)
4) One or more pairs of helping hands in the immediate vicinity of
Annapolis Maryland.
5) Navy VIP's with friends, contacts, alumni, whatever to be our PR man..
preferably on the "in side" at the Naval Academy or Naval PG school in
Monterey.
THE GOOD NEWS is that these will be 5" cubesats and that supports twice
the volume of a 4" cubesat. Tho the power is still miniscule...
Again, there are all kinds of unknowns here. Please don't pester me with
questions. Those people in the unique situation to contirbute will know
who they are, Thanks.
This program is "approved" at the highest DOD levels, but I have not been
able to work on it since it was approved and unless I have a really good
feeling about proceeding, I may have to push it off a y ear. DOD is
pushing me to commit to a launch within 2 years.
We work towards Prelimiary Deisgn by November, Critical Design review in
the Spring, then we spend the next Fall building flight hardware and
launch in the SPring.
de WB4APR@amsat.org, Bob
PCsat WEB page http://www.ew.usna.edu/~bruninga/pcsat.html
PCSAT2 http://www.ew.usna.edu/~bruninga/pcsat2.html
CUBESAT Designs http://www.ew.usna.edu/~bruninga/cubesat.html
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