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ZL3AI > APRDIG 15.06.03 09:04l 182 Lines 6915 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Jun 12, 2/2
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: Help with geo file for radar
From: "Alton" <n5psp@n5psp.org>
Date: Thu, 12 Jun 2003 14:59:03 -0500
X-Message-Number: 12
On 8 Jun 2003, at 16:28, Michael J. Wolthuis wrote:
>Everyone,
>I am trying to put a .geo file of Grand Rapids NWS radar into Xastir.
>So far I have found the actual URL of the image, but what is the best
>way to make/pick the tie points? Do you just use an image editor to get
>two sets of pixels and then pick close coordinates?
That's what I did with a mapblast screen shot so I could view tracks
in my area. It took a few iterations of tweak the .geo file, upload to
server, and refresh the image (using findu.com's cgi server to draw
the tracks) before I got it accurate.
The next *.geo file I make, I'll physically visit two landmarks that
are on the image file as close to opposite corners as possible and
capture the exact coordinates, then use an image editor to find the
pixel that matches the intersection, county / state line / corner,
etc. for the tiepoints. That should pin it down close enough for the
scale of the particular image.
One of my experiments can be viewed (when all the servers are up)
at http://www.findu.com/cgi-bin/line.cgi?call=n5psp-
12:0:255:100&geo=http://www.n5psp.org/Images/permian2.geo&sta
rt=100
Or you can look at the actual .geo file and its associated picture.
----------------------------------------------------------------------
Subject: Re: VOICE ALERT for Europe
From: wes@johnston.net
Date: Thu, 12 Jun 2003 16:44:19 -0400 (EDT)
X-Message-Number: 13
hmmm..., if i have a bad power supply for my tnc at home. my tnc has a
full wave bridge, and makes a quiet 100hz hum (120hz in the usa). Now my
home station is generating a hum which could be misconstrued as a 100hz pl
tone to a nearby mobile station.
I'm not a RF engineer either, but I did stay in a holiday inn express for a
few weeks once..... lol.
wes
----------------------------------------------------------------------
Subject: Re: Help with geo file for radar
From: "Curt Mills, WE7U" <hacker@tc.fluke.com>
Date: Thu, 12 Jun 2003 13:52:52 -0700 (PDT)
X-Message-Number: 14
With Xastir (runs on lots of operating systems, including Windows), you can
do the below steps. You must have compiled with the ImageMagick library
for the below functionality:
Select any of:
a) On-line topographic maps (Map Chooser->toposerver.geo)
b) On-line satellite images (Map Chooser->terraserver.geo)
c) On-line street maps (Maps->Enable/Configure Tigermap)
Xastir will snag the proper map image and georeference it for you. The
three options above are only available for the U.S. though I think.
Click on Stations->Fetch Findu Trail and enter a station you wish to see
the track for. You can snag up to the last two weeks of posits. Repeat to
see more station's tracks.
-OR- just connect to an internet or RF feed (or several of each) and wait
for the tracks to come in.
Xastir does the georeferencing and map image downloading for you. All you
do is pan/zoom where you please. Of course it helps if you have a
higher-speed connection, but if you keep the Xastir window small, it's
usable (although slow) from a dial-up link. Local maps are _much_ faster
of course.
The above map types (plus rather a lot more) are available with the current
CVS version of Xastir. A new "stable" Xastir release will be coming out
within the next few days. Probably tomorrow barring any last-minute
problems.
--
Curt Mills, WE7U hacker_NO_SPAM_@tc.fluke.com
Senior Methods Engineer/SysAdmin
"Lotto: A tax on people who are bad at math!"
"Windows: Microsoft's tax on computer illiterates!" -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
----------------------------------------------------------------------
Subject: Re: VOICE ALERT for Europe
From: Alex <kr1st@amsat.org>
Date: Thu, 12 Jun 2003 20:44:23 -0400
X-Message-Number: 15
I understand about the power supply, which I why I mentioned about the
inverter and power supply. I was just thinking that I must be missing
something bigger that would make 100 Hz such a terrible choice. If the
relationship between the AC frequency and the PL tone would be the only
concern, then I don't onderstand the need for an extensive test of a
different tone. It's not all that important of course, just wondering if
what I'm missing.
(yes, I know I miss THAT too! :) )
Thanks for the reply and 73,
--Alex KR1ST (pondering the concept of a DC tone)
wes@johnston.net wrote:
>
>hmmm..., if i have a bad power supply for my tnc at home. my tnc has a full
>wave bridge, and makes a quiet 100hz hum (120hz in the usa).
----------------------------------------------------------------------
Subject: Balloon flights this Saturday
From: "Mark Conner" <n9xtn@cox.net>
Date: Thu, 12 Jun 2003 20:54:02 -0500
X-Message-Number: 16
There are two sets of balloon flights coming up this Saturday morning.
The 2003 Great Plains Super Launch will be held at Deer Trail, CO with a
launch time of 1300 UTC. Six balloons will fly simultaneously from this
location. For frequencies and further details, see the website at
http://gpsl.eoss.org .
Nebraska Stratospheric Amateur Radio will launch a balloon at approximately
the same time from a launch site near Treynor, IA. Primary APRS will be on
144.34 MHz with callsign N9XTN-11 and backup APRS on 144.39 MHz with
callsign N9XTN-12. A simplex repeater will be on the payload on 446.30
MHz. Further details are at http://www.nstar.org .
Maximum altitudes for these flights will be between 90,000 and 100,000 ft.
Total flight time will be about 2.5 hours.
Further updates will be posted to http://groups.yahoo.com/group/KNSP and
http://groups.yahoo.com/group/GPSL as well as the respective web sites.
73 de Mark N9XTN
------
Mark D. Conner
E-mail: n9xtn@arrl.net
Homepage: http://members.cox.net/mconner1
"Arrogance and stupidity, all in the same package.....how
efficient of you!" - Ambassador Londo Mollari, Babylon 5
----------------------------------------------------------------------
Subject: Re: VOICE ALERT for Europe
From: "Wes Johnston" <wes@johnston.net>
Date: Thu, 12 Jun 2003 22:12:02 -0400
X-Message-Number: 17
What I'm trying to say is that a HOME station can accidentally send a PL
tone. The will cause mobiles to think they are hearing another mobile when
in fact it's a home station (and could also be unmanned). It just adds to
the QRM.
Also... for those of you with d700 radios, use PM mode 1 for your normal
drive time. Used PM mode 2 for parked.... posit rate reduced, status text
to off duty, and PL tone anything other than 100hz. If you send ANY other
PL tone other than 100hz when you are out of your car, then I don't hear
your car squawking. If you are in your car, by all means send a pl tone of
100hz.
Wes
---
END OF DIGEST
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