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ZL3AI > APRDIG 13.12.03 15:41l 171 Lines 5909 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Dec 09, 1/1
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To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Tuesday, December 09, 2003.
1. Re: New APRSdos MILE-MARK display
2. Mangled TT3 from KB7PUX-7
3. Re: National Parks Digi Coverage (Rev 3)
4. Milemarks stuff
5. d7a GPS Cable?
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Subject: Re: New APRSdos MILE-MARK display
From: "Cap Pennell" <cap@cruzio.com>
Date: Tue, 9 Dec 2003 02:15:16 -0800
X-Message-Number: 1
Hold on, here we go.
http://www.dot.ca.gov/hq/traffops/signtech/calnexus/
73, Cap KE6AFE
>From: On Behalf Of Bob Bruninga
>Sent: Monday, December 08, 2003 19:44 PM
>
>The idea was that the APRSdos milemarker file for the interstates can be
>used by anyone's maping program. If I missed any, anyone can simply add
>it by looking at a highway map and entering a few coordinates.
>
>On Mon, 8 Dec 2003, Scott Miller wrote:
>
>>Except for maybe the Interstates, there really AREN'T mile markers
>>throughout California.
>
>Ah, so they still havent upgraded. Hummh. thanks. Yes, this concept is
>only intended for those highways that are clearly amarked and visible to
>the traveler. only the interstates meet that bill in most states...
>
>>As for sources, I've only been able to find national data on navigable
>>waterway mile markers, not highways. Some states have shapefiles, though.
>>I think Xastir users would be wise to investigate this, assuming Xastir can
>>be configured to show the proper data.
>
>I hand edited the existing file manually over several weeks of effort with
>aroad atlas of every state...
>
>>For anything below Federal highway level, I assume you'll need State data.
>
>You only need a few data points for the whole highway. Only the mile
>marks (or an exit number) where there is a change in direction..
>
>It would be best if we just all used the same file and improved on it...
>then we would all have the same reference...
> de Wb4APR, Bob
>
>>----- Original Message -----
>>From: "Bob Bruninga" <bruninga@usna.edu>
>>>And anyone can add any interstate to the file (though I dont want to
>>>clutter it up with a bunch of local roads that no one else needs)....
>>>But we DO NEED CALIFORNIA. Back in 1990s when I put this in APRS,
>>>California did not have Milemarks, so they are not in the file..
>>>(volunteers?)
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Subject: Mangled TT3 from KB7PUX-7
From: "Scott Miller" <scott@opentrac.org>
Date: Tue, 9 Dec 2003 10:40:50 -0800
X-Message-Number: 2
This came up on the CA APRS list.
http://www.findu.com/cgi-bin/raw.cgi?call=kb7pux-7
KB7PUX-7 appears to be a TinyTrak3 sending uncompressed position reports
with timestamp, course/speed, and altitude. Trouble is, many of the packets
are mangled. For example:
KB7PUX-7>APT310,WIDE2,qAR,AE6JN:/A81852z3430.39N/11719.31W>222/00W/A=002873
Note the 'a' in the timestamp field, the the 'w' in the speed.
Interestingly, this seems to happen regardless of what IGATE it comes
through. I've seen the mangled packets on the air myself. And I don't see
any other mangled stations in the area, which is usually a symptom of a bad
PASSALL setting someplace. There's another nearby station running the same
configuration on a TT3 and he's showing no errors at all.
I'm curious if perhaps it's got a noisy connection to the GPS. Since NMEA
employs an 8-bit checksum, that means it's going to fail to detect about 1
error in 256. My Garmin puts out one full NMEA report every two seconds, so
that's potentially one undetected error every nine minutes - enough for a
tracker to look like it's working, maybe.
Byon - does the TT3 verify the NMEA checksum? In what way could it be
expected to fail given corrupted inputs? Could the encoding routines
produce the kind of errors shown?
SIG - assuming the output of the device is valid (maybe someone local can
verify), how is it we're seeing runs of very similar errors coming from
multiple places?
Scott
N1VG
----------------------------------------------------------------------
Subject: Re: National Parks Digi Coverage (Rev 3)
From: Frank - KG6JVE <kg6jve@pasadena.net>
Date: Tue, 9 Dec 2003 11:09:02 -0800 (PST)
X-Message-Number: 3
I'm going there in a few weeks. I'll report my findings.
Frank
On Thu, 4 Dec 2003, Bob Bruninga wrote:
>Sequoia 838,000 6 ?
----------------------------------------------------------------------
Subject: Milemarks stuff
From: Bob Bruninga <bruninga@usna.edu>
Date: Tue, 9 Dec 2003 15:59:34 -0500 (EST)
X-Message-Number: 4
I put all my info about Milemarks on my APRS errata page. Its about the
6th link down in the list.
http://www.ew.usna.edu/~bruninga/aprs/errata.html
There is a map example, my MILEMARK.TXT descriptive file and a copy of my
Basic source code used to display them... and the MM.DAT file itself...
though I had to save it as a .TXT file for your browser to let you get it.
Just rename it to MM.DAT before use.
Anyone should be able to take it an be able to overlay the mile marks on
any map. Again, my only objective was to overlay a one mile ambiguity
circle in the vicinity of where the mile mark should be to guide the
user where a non-APRS station might be that reports his position by
milemark.
de WB4APR, Bob
----------------------------------------------------------------------
Subject: d7a GPS Cable?
From: Frank - KG6JVE <kg6jve@pasadena.net>
Date: Tue, 9 Dec 2003 15:35:24 -0800 (PST)
X-Message-Number: 5
I'm looking for a few varieties of GPS cables for the Kenwood d7a. Does
anyone sell good sturdy cables to connect directly from the d7a to the
Garmin Etrex series?
Perhaps custom cables to connect directly from the d7a to various PDAs as
well?
I've built some, but would prefer something more sturdy than my Radio
Shack connectors and various adaptors.
Thank you.
Frank Keeney
KG6JVE
---
END OF DIGEST
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