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ZL3AI > APRDIG 18.11.03 06:21l 254 Lines 7361 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Nov 08, 1/1
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Saturday, November 08, 2003.
1. Server selection problem
2. RE: Server selection problem
3. Re: Server selection problem
4. APRS on 900 MHz
5. Re: APRS on 900 MHz
6. Tiger map setup
7. APRS Barometric
8. Re: APRS on 900 MHz
9. Re: APRS on 900 MHz
10. Re: APRS on 900 MHz
11. Re: APRS on 900 MHz
12. APRS Icon statistics
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Subject: Server selection problem
From: "Jacob Tennant" <k8jwt@adelphia.net>
Date: Sat, 8 Nov 2003 00:01:43 -0500
X-Message-Number: 1
I am having a small problem connecting to the internet servers.
I have creted a new aprsserv.txt file however I cannot seem to get rid of
the listings for old unavailable servers that aren't even listed in the
aprsserv.txt file?
Any ideas???
Jacob Tennant-K8JWT
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Subject: RE: Server selection problem
From: "AE5PL Lists" <HamLists@ametx.com>
Date: Sat, 8 Nov 2003 06:37:01 -0600
X-Message-Number: 2
What software and version are you using?
73,
Pete Loveall AE5PL
pete@ae5pl.net
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Subject: Re: Server selection problem
From: Robbie WA9INF <mwrobertson@comcast.net>
Date: Sat, 08 Nov 2003 07:52:54 -0600
X-Message-Number: 3
Jacob,
WinAPRS also will use arpsxtra.txt for servers, so put a semicolon in
front of each server you don't want to use..
Good luck,
Robbie
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Subject: APRS on 900 MHz
From: "Robert Mitchell / KD4PBC" <aprs@kd4pbc.net>
Date: Sat, 8 Nov 2003 12:22:56 -0500
X-Message-Number: 4
Has there been any talk of 9600 APRS on the 900 band ?
UHF seems to be dead in the water.
There are plenty of frequencies and cheap equipment in 900.
900 acts like 440 as far as range goes.
Most ham repeaters at 900 use a 25 MHz split 902 mobile TX and 927 base
TX so one could locate a single "pass" cavity on use a freq in the
middle like 916.3900 MHz.
There are tons of old paging transmitters and antennas that can be had
for a song.
Might be something to look at.
Robert / KD4PBC
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Subject: Re: APRS on 900 MHz
From: Doug Bade <dbade@clecom.com>
Date: Sat, 08 Nov 2003 13:42:42 -0500
X-Message-Number: 5
Hello Robert and group;
Speaking from current application testing, 9600 baud in 12.5 KHz
channel I.F. spaced radios would be pretty unreliable, without significant
modification to the IF stages (unless they were designed to do just that)
..... 2400 is one thing. I would suggest going to real high bandwidth ( 56k
??) and really make it sing for backbone, if you are going to do IF
mods....Keep in mind these are narrowband radios to start with. Filters can
be changed, but it is not quite as simple as just programming and hooking
them up...
Doug KB8GVQ
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Subject: Tiger map setup
From: "Jacob Tennant" <k8jwt@adelphia.net>
Date: Sat, 8 Nov 2003 16:47:48 -0500
X-Message-Number: 6
I have junked the PM mapping system in favor of the TIGER maps.
I have downloaded ALL of the map data for my local area. WEST VIRGINIA/ALL
COUNTY DATA
I get nice state and county outlines however how do I get it to show streets
and other details at close levels?
Running version 2.7.1 registered
Jacob Tennant-K8JWT
----------------------------------------------------------------------
Subject: APRS Barometric
From: "Andy Pritchard" <apritch@blueyonder.co.uk>
Date: Sat, 8 Nov 2003 23:32:56 -0000
X-Message-Number: 7
Hi All
When you create a WX report is it supposed to be in absolute or relative
barometric pressure? It dosen't say in the APRS spec
73 - Andy, M0CYP
UI-View http://welcome.to/uiview
Propagation http://welcome.to/dxradio
Prop. Mon. 144.800 Mhz - Telford - IO82SQ
----------------------------------------------------------------------
Subject: Re: APRS on 900 MHz
From: "Frank Kostelac" <frank@kostelac.com>
Date: Sat, 8 Nov 2003 16:16:26 -0800
X-Message-Number: 8
Watch out, there is a lot of ATV on 900.
Frank
----------------------------------------------------------------------
Subject: Re: APRS on 900 MHz
From: "Jacob Tennant" <k8jwt@adelphia.net>
Date: Sat, 8 Nov 2003 19:33:17 -0500
X-Message-Number: 9
Couldn't we still use 1200baud on 900Mhz? or even 2400baud?
It would make it a little bit easier...
Jacob Tennant-K8JWT
----------------------------------------------------------------------
Subject: Re: APRS on 900 MHz
From: David VanHorn <dvanhorn@cedar.net>
Date: Sat, 08 Nov 2003 19:59:56 -0500
X-Message-Number: 10
At 04:16 PM 11/8/2003 -0800, Frank Kostelac wrote:
>Watch out, there is a lot of ATV on 900.
>Frank
Yes, but the band is HUGE and there is plenty of space for both, and a
bandplan.
----------------------------------------------------------------------
Subject: Re: APRS on 900 MHz
From: David VanHorn <dvanhorn@cedar.net>
Date: Sat, 08 Nov 2003 20:06:08 -0500
X-Message-Number: 11
At 07:33 PM 11/8/2003 -0500, Jacob Tennant wrote:
>Couldn't we still use 1200baud on 900Mhz? or even 2400baud?
>It would make it a little bit easier...
Sure. Keep the deviation down, should be fine.
It would be really nice to find a radio that was easily moddable, and
wideband enough to do 56k at least.
Mobile flutter is an issue, but if your packets are small (timewise) then
the likelyhood of them getting clobbered is less. This is part of what
Benoit Mandelbrot was researching.
----------------------------------------------------------------------
Subject: APRS Icon statistics
From: Bob Bruninga <bruninga@usna.edu>
Date: Sat, 8 Nov 2003 22:21:33 -0500 (EST)
X-Message-Number: 12
On my APRS SPEC ERRATA page dealing with ICONS (Symbols) Is a link to
James Jeffersons ICON statistics. I just looked at if closely and there
are some interesting things:
1) MOST used by 3-to-1 margin is the HOUSE (20%) 2% use beams, 1% are HF
2) The next most is the CAR (5.6%) All mobiles total over 15%
3) The third is Weather! (5.5)
4) The forth is WideN-N Digipeaters (3.2)
As the percentages get smaller, I found it interesting to group them...
- Digis total to 7.6% but notice that n-N digis are only HALF (include U)
- Of the 15.5% mobiles, 2nd is Pickups, then jeeps, then Vans then RV's
- 1 mobile in 25 is an 18 Wheeler. One in 30 is a Balloon.
- 2.4% of all stations use the TCPIP or IGate ICON.
- All the other icons are 0.2% or less
INTERESTING CONCLUSIONS:
* There are a LOT MORE non-n-N digipeaters (more than HALF) than I
thought. So those people wanting to use WIDEn-N in their mobile paths
will only be digipeated by HALF or so digis in the country. (though it is
very area specific. Out west, most are WIDEn-N...)
* The Weather was surprisingly high (though the CITIZENS WX(non -HAM)
stations skew this quite a bit).
* The above represents less than HALF of all ICONS. Thus there is a
LOT of other stuff going on in APRS that uses the other 170 or so
ICONS (that are each used less than 0.2% of the time...)
MY ICON page is: http://web.usna.navy.mil/~bruninga/aprs/symbols.html
And his link is at the bottom..
de WB4APR@amsat.org, Bob
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END OF DIGEST
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