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ZL3AI > APRDIG 23.10.06 07:13l 232 Lines 8968 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 27 #27, 1/2
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To : APRDIG@WW
Today's Topics:
1. FW: [nwaprssig] D700 UHF APRS DIGI (Herb Gerhardt)
2. RE: FW: [nwaprssig] D700 UHF APRS DIGI (scott_at_opentrac.org)
3. Re: FW: [nwaprssig] D700 UHF APRS DIGI (Joel Maslak)
4. Pulse Mod (Andrew Rich)
5. Re: D700 UHF APRS DIGI (wa7nwp_at_jnos.org)
6. Cheap GPS suggestion? (Joel Maslak)
7. Re: Cheap GPS suggestion? (VE7GDH)
8. Re: Cheap GPS suggestion? (John Habbinga)
9. RE: Cheap GPS suggestion? (Alan P. Biddle)
10. RE: Cheap GPS suggestion? (VE7GDH)
11. RE: Cheap GPS suggestion? (scott_at_opentrac.org)
12. Re: APRS group on Myspace (Stephen Brown Jr)
13. RE: APRS group on Myspace (Eric Goforth)
14. Re: Pulse Mod (Jack Cavanagh)
15. Re: Cheap GPS suggestion? (Terry Palmer)
16. Findu maps and sat'view (Dave Baxter)
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Message: 1
Date: Mon, 25 Sep 2006 12:31:47 -0700
From: "Herb Gerhardt" <hgerhardt_at_wavecable.com>
Subject: [aprssig] FW: [nwaprssig] D700 UHF APRS DIGI
Since the TAPR APRS list seems to have come to a slow crawl lately, maybe
some of the members who are interested in new APRS development want to join
our NW APRS SIG and follow the development of 9600 baud APRS.
Bellow is a message of a discussion we have been having for about a month
now on 9600 baud UHF APRS that we are experimenting with on the NW APRS
Group Network. It looks like we are coming up with another innovative more
efficient APRS network. Maybe those of you who are innovative and curious
on helping to pioneer a more efficient APRS Network should subscribe to our
list to follow our development. Maybe some other congested areas want to
give 9600 baud a try. I am sure Bob King K7OFT would be more than willing
to help you get started.
You can subscribe to our list at our web site below.
Herb, KB7UVC
NW APRS Group, West Sound Coordinator
Our WEB Site: http://www.nwaprs.info
-----Original Message-----
From: nwaprssig-admin_at_nwaprs.info [mailto:nwaprssig-admin_at_nwaprs.info] On
Behalf Of David Dobbins
Sent: Monday, September 25, 2006 9:40 AM
Subject: Re: [nwaprssig] D700 UHF APRS DIGI
Thanks to both Bob and Scott for their efforts. We're breaking new ground
here. Far as I know, there is no other APRS interest group with a 9600 baud
UHF activity. The plan to expand the system here in Spokane is coming
along. I'm still looking for a home for the 9600b digi. It needs to be
mountaintop or tower top somewhere near Spokane.
I think we have the digi settings all worked out. We'll leave them on the
wiki pages, but I will duplicate them to the website shortly, now that we
have settings ironed out. This is critical with using a D700 as a remote
digi, because unlike the KPC-3, there is no remote connect to make further
changes. It would take another trip to the hill for those changes.
Come on Portland OR and Vancouver BC, any interest in your neck of the
woods?
Let's spread this good stuff faster than the bird flu!
David
On 9/25/06, R.M. King <krm1012_at_qwest.net> wrote:
I'm not sure, but Scott may have been referring to the original file we
used to set up the D700 on UBALDI. That file is stored on my home computer
and my laptop. It has been modified to correct for the BEACON E 15 error.
It has been changed to BEACON E 90.
By the way, I did some testing with the D700 DIGI on Baldi to test the
decrementing feature of WIDEn-N. The results of the testing show that the
D700 DOES indeed decrement a WIDEn-N packet. And that was done with the
TNC set in the configuration shown on the wiki page. I would encourage
others to verify this.
The test that Scott just finished this weekend when he traveled to Eastern
Wa. and earlier tests I have done in Eastern Wa and Puget Sound, and
comments from others taking up 440.875MHz 9600 Baud operations here should
once and for all put away the commonly held notion that you need super
strong signals to work 9600 Baud. It is simply not true. My field tests
indicate that 9k6 works as well as and in certain situations, better than
1k2 operations. Give it a try!
Scott, thanks for putting the APRS 9k6 Baud DIGI on Baldi. It will
certainly open lots of eyes.
Bob King
K7OFT.
_______________________________________________
nwaprssig mailing list
nwaprssig_at_nwaprs.info
http://www.nwaprs.info/mailman/listinfo/nwaprssig
--
David Dobbins
Medical Lake, WA
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Message: 2
Date: Mon, 25 Sep 2006 12:50:58 -0700
From: <scott_at_opentrac.org>
Subject: RE: [aprssig] FW: [nwaprssig] D700 UHF APRS DIGI
Why use a D700 as a digi? From what I've heard, it has a hard-coded 500 ms
TXD. That completely destroys any increase in throughput you might get by
going to 9600. You could put a LOT of FEC data on the packet, though!
Scott
N1VG
------------------------------
Message: 3
Date: Mon, 25 Sep 2006 13:54:45 -0600
From: Joel Maslak <jmaslak-aprs_at_antelope.net>
Subject: Re: [aprssig] FW: [nwaprssig] D700 UHF APRS DIGI
On Sep 25, 2006, at 1:31 PM, Herb Gerhardt wrote:
>Bellow is a message of a discussion we have been having for about a
>month now on 9600 baud UHF APRS that we are experimenting with on
>the NW APRS Group Network. It looks like we are coming up with
>another innovative more efficient APRS network. Maybe those of you
>who are innovative and curious on helping to pioneer a more
>efficient APRS Network should subscribe to our list to follow our
>development. Maybe some other congested areas want to give 9600
>baud a try. I am sure Bob King K7OFT would be more than willing to
>help you get started.
If most users are D700 users, or you're using a D700 for a digi, you're
losing 4800 bits of data bandwidth every time one of them transmits due to
the obscene TX Delay on those units. 4800 bits is quite a bit of APRS... :(
That said, going to 9600 BPS is long overdue. The higher losses very well
might be overcome by the fact that the packet is on the air less time, thus
less susceptible to collisions and transient noise.
------------------------------
Message: 4
Date: Tue, 26 Sep 2006 06:48:50 +1000
From: "Andrew Rich" <vk4tec_at_tech-software.net>
Subject: [aprssig] Pulse Mod
Gudday
I have been looking closely at how aircraft send their positions using ADS-B
on 1090 MHz.
The data burst is around 112us and happens every 0.5 second.
Just wondering why we as hams do not do such a thing ?
Is it the bandwidth restrictions ?
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec_at_tech-software.net
web: http://www.tech-software.net
Brisbane AUSTRALIA
------------------------------
Message: 5
Date: Mon, 25 Sep 2006 16:08:09 -0500 (CDT)
From: wa7nwp_at_jnos.org
Subject: Re: [aprssig] D700 UHF APRS DIGI
>If most users are D700 users, or you're using a D700 for a digi,
>you're losing 4800 bits of data bandwidth every time one of them
>transmits due to the obscene TX Delay on those units. 4800 bits is
>quite a bit of APRS... :(
Only if you're running in APRS mode. In "TNC" mode the TXD is adjustable.
You also get KPC3+ or better digipeater controls in TNC mode. In "APRS"
mode you only have 4 simple aliases for digipeating.
This one little D700 on a hilltop has sure opened up the 9600 baud network
in the Puget Sound region.
We still have yet to test what happens if a nice long, 250+ bytes, packet
is thrown at it.
Bill - WA7NWP
------------------------------
Message: 6
Date: Mon, 25 Sep 2006 15:43:34 -0600
From: Joel Maslak <jmaslak-aprs_at_antelope.net>
Subject: [aprssig] Cheap GPS suggestion?
I'm looking for a cheap new GPS for a vehicle. I do not expect it to have
a display. It'd be good if it would run off of 12V power. It must output
4800 BPS NMEA.
What is out there right now? I'm using an eTrek right now, but I'd rather
not tie up my handheld GPS for the truck.
On a different subject - routing power in a 2003 Silverado pick- up... I
drilled through the firewall, when inside the vehicle, just down and right
of the main wiring harness that goes from the engine compartment to the
interior fuse panel - watch out for the brake hydraulics, but they are
pretty easy to not hit. A 3/8" drill bit and a Toyota PVC grommet were
perfect for the 4 gauge wire I ran; I only ran one wire, and am using the
chassis for return, as I've had great luck with that in other vehicles. I
mounted a small power distribution block right behind the driver's seat.
There's a small flat spot between the driver's seat and rear bulkhead where
I can place the "stack".
The antenna had to be the easiest antenna installation ever for me - took
me 20 minutes to drill the hole in the roof, route the cable, and solder a
connector. There is ample space in the center of the vehicle between the
headliner and the roof - just stick a piece of cardboard there to catch the
nearly-red-hot circle as it drops down. Add a 1/4 wave whip and it's an
installation that doesn't draw excessive attention to itself.
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