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ZL3AI > APRDIG 26.07.06 22:39l 262 Lines 7928 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 25 #24, 1/1
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From: ZL3AI@ZL2BAU.#87.NZL.OC
To : APRDIG@WW
Today's Topics:
1. Re: is that pcsat2 in the background ? (Robert Bruninga)
2. RE: RAW GPS NMEA Data (Andrew Rich)
3. Re: RE: RAW GPS NMEA Data (Steve Dimse)
4. RE: RE: RAW GPS NMEA Data (Stan - N0YXV)
5. Looking for info on GPS clock synchronization (Ben Jackson)
6. RE: Looking for info on GPS clock synchronization (scott_at_opentrac.org)
7. RE: vehicle laptop mount for APRS rig (Frank Keeney)
8. RE: Jotto Desk for Jeep (Frank Keeney)
9. RE: Jotto Desk for Jeep (Frank Keeney)
10. RE: RE: RAW GPS NMEA Data ((SV2AGW)George Rossopoulos)
----------------------------------------------------------------------
Message: 1
Date: Sun, 23 Jul 2006 14:45:14 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: Re: [aprssig] is that pcsat2 in the background ?
>Is that PCSAT2 in the background?
>
>http://www.ninfinger.org/~sven/models/vault/soyuz-tma2-iss-desk-1280.jpg
Good eye! Close, but no cigar. PCSAT2 is actually the 5th flight of MISSE,
Materials In Space Science Experiments (the suitcase)...
PCSAT2/MISSE5 is on the ISS, but MISSE's have flown before on MIR and ISS
but none have had an active RF payload. When we heard of them, we asked for
a free ride and got one on MISSE5. MISSE5 will be returned to earth on the
next Space SHuttle at the end of August. And hopefuly may fly someday
again...
see http://www.ew.usna.edu/~bruninga/pcsat2.html
------------------------------
Message: 2
Date: Mon, 24 Jul 2006 06:50:08 +1000
From: "Andrew Rich" <vk4tec_at_tech-software.net>
Subject: [aprssig] RE: RAW GPS NMEA Data
George,
The fact that it transmitts RAW or MIC-E or compressed is neither here nor
there.
As for the SSID, i would pick a -9 and car.
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec_at_tech-software.net <mailto:vk4tec_at_tech-software.net>
web: http://www.tech-software.net
Brisbane AUSTRALIA
-----Original Message-----
>From: (SV2AGW)George Rossopoulos [mailto:sv2agw_at_raag.org]
>
>Hi
>
>What should be the Icon for a station that TX Raw GPS NMEA senetences?
>Shall I pikj the Icon from the call extension or what else.
>I assume that a station with an SSID of 9 is a mobile station(car).
>
>73
>
>micro USB TNT (A pocket TNC with Build in Tracker and APRS digi with USB and
>battery for portable operation)
>www.elcom.gr
>
>(SV2AGW)George Rossopoulos
>sv2agw_at_elcom.gr
>www.elcom.gr/sv2agw
>+306932465216
>George Rossopoulos
>Nikanoros 59
>54250,Thessaloniki
>Greece
------------------------------
Message: 3
Date: Sun, 23 Jul 2006 17:07:36 -0400
From: Steve Dimse <steve_at_dimse.com>
Subject: Re: [aprssig] RE: RAW GPS NMEA Data
On Jul 23, 2006, at 4:50 PM, Andrew Rich wrote:
>The fact that it transmitts RAW or MIC-E or compressed is neither here nor
>there.
No, it is quite significant. The Mic-E and compressed formats include
mandatory symbol fields. The NMEA packets had a default based on SSID which
has been deprecated, now all should use the GPSxy(z) construct in the
destination field, which allows access to every symbol in the tables.
Steve K4HG
------------------------------
Message: 4
Date: Sun, 23 Jul 2006 17:51:32 -0500
From: "Stan - N0YXV" <n0yxv_at_gihams.org>
Subject: RE: [aprssig] RE: RAW GPS NMEA Data
>No, it is quite significant. The Mic-E and compressed formats include
>mandatory symbol fields. The NMEA packets had a default based on SSID
>which has been deprecated, now all should use the GPSxy(z) construct
>in the destination field, which allows access to every symbol in the
>tables.
When I started my KPC3 Tracker I thought all I needed was the -9. Icon on
UI-VIEW came up as a home. Boy did I enjoy some fun ribbing about my "Mobile
Home". :-D
P.S. If you want a car icon try GPSMV.
------------------------------
Message: 5
Date: Sun, 23 Jul 2006 16:04:55 -0700
From: Ben Jackson <ben_at_ben.com>
Subject: [aprssig] Looking for info on GPS clock synchronization
I'm looking for information about what clock information can be extracted
from a standard NMEA string. For example, which moment during sentence
transmission is associated with the timestamp(s), whether GPS units that
only output 1s time resolution typically send sentences aligned to the
second, whether there's any spec for the baud timing accuracy, or the start
intervals of sentence groups.
Basically anything to can do with a GPS that doesn't have PPS output to get
into the 1-3ppm accuracy range.
--
Ben Jackson AD7GD
http://www.ben.com/
------------------------------
Message: 6
Date: Sun, 23 Jul 2006 16:25:02 -0700
From: <scott_at_opentrac.org>
Subject: RE: [aprssig] Looking for info on GPS clock synchronization
I've looked for this myself, and I think it's going to be somewhat
device-specific. The only one I've ever found that actually lists this kind
of information is the Garmin GPS 18:
http://www.garmin.com/manuals/425_TechnicalSpecification.pdf
By default, the sequence starts with GPRMC and references the 1pps output
immediately preceeding it. It doesn't say specifically how the timing of
the serial transmission relates to that pulse.
Good luck getting that sort of accuracy from serial alone - you're still
limited by the local RS-232 clock on the receiving end. My OpenTrackers,
for example, get their serial clock from a 20ppm crystal. Plus, being an
asynchronous protocol the clocks aren't synced anyway. The UART's just
sampling at some multiple of the baud rate and doesn't care about start bit
edges. At least, that's true of the devices I've used.
Even if you could get accuracy to 1/8 bit time, that's like 26 ppm at 4800
baud.
Try timing the interval from one $GPRMC sentence to the next - could be
there's NO specific timing relationship, other than that it's sent sometime
during the second in question.
If you need 1-3ppm accuracy, you're just going to have to get a unit with a
1pps output. Deluo's units don't have one anymore, so I recommend the GPS 18.
Scott
N1VG
------------------------------
Message: 7
Date: Sun, 23 Jul 2006 16:59:41 -0700
From: "Frank Keeney" <kg6jve_at_gmail.com>
Subject: RE: [aprssig] vehicle laptop mount for APRS rig
Stephen Smith's new car uses a Ram Pod with a modified laptop mount that
includes fans.
Here's my setup:
http://www.unwiredadventures.com/unwire/2006/05/ultimate_automo.html
Easy to remove when someone needs to ride in the passenger seat.
Frank
KG6JVE
------------------------------
Message: 8
Date: Sun, 23 Jul 2006 17:01:22 -0700
From: "Frank Keeney" <kg6jve_at_gmail.com>
Subject: RE: [aprssig] Jotto Desk for Jeep
If Jotto does not have one, see: http://www.ram-mount.com
Frank
KG6JVE
------------------------------
[duplicate]
------------------------------
Message: 10
Date: Mon, 24 Jul 2006 18:40:49 +0300
From: "\(SV2AGW\)George Rossopoulos" <sv2agw_at_raag.org>
Subject: RE: [aprssig] RE: RAW GPS NMEA Data
Hi
Thank you for the indication.
I should have seen........but sometimes..........
73
micro USB TNT (A pocket TNC with Build in Tracker and APRS digi with USB and
battery for portable operation)
www.elcom.gr
(SV2AGW)George Rossopoulos
sv2agw_at_elcom.gr
www.elcom.gr/sv2agw
+306932465216
George Rossopoulos
Nikanoros 59
54250,Thessaloniki
Greece
-----Original Message-----
>
>>No, it is quite significant. The Mic-E and compressed formats include
>>mandatory symbol fields. The NMEA packets had a default based on SSID
>>which has been deprecated, now all should use the GPSxy(z) construct
>>in the destination field, which allows access to every symbol in the
>>tables.
>
>When I started my KPC3 Tracker I thought all I needed was the -9. Icon on
>UI-VIEW came up as a home. Boy did I enjoy some fun ribbing about my "Mobile
>Home". :-D
>
>P.S. If you want a car icon try GPSMV.
------------------------------
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