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ZL3AI > APRDIG 16.04.03 11:06l 281 Lines 9260 Bytes #999 (0) @ WW
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To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Sunday, April 13, 2003.
1. RE: APRS Multi Line
2. RE: APRS Multi Line
3. Re: XASTIR not igating
<LYR30130-128438-2003.04.12-12.13.56--andrew.rich#bigpond.com@lists.tapr.org>
4. APRS MySQL
5. RE: APRS Multi Line
6. OT:schematic help?
7. Re: findU2 down
8. RE: APRS Multi Line
9. Re: findU2 down
10. RE: APRS Multi Line
11. RE: OT:schematic help?
12. Re: findU2 down
13. RE: APRS Multi Line
14. County map files?
15. Re: County map files?
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Subject: RE: APRS Multi Line
From: radio_q@juno.com
Date: Sat, 12 Apr 2003 22:34:53 -0600
X-Message-Number: 1
On Sat, 12 Apr 2003 15:51:18 -0400 Jeff King <jeff@aerodata.net> writes:
>This would at least save the TXD time, which could be substantial
>since it seems to be the norm on APRS to use TXD's 3-4 times longer then what
>is really needed.
I'm curious as to what you think is the norm and how you proved it to
yourself? i.e., what tests did you do on your specific digi network to show
what is an optimum TXD and what default you are talking about that is 3 to
4 times that amount.
Thanks
Jim
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Subject: RE: APRS Multi Line
From: Miller Scott Contr 30SCS/FTI <Scott.Miller@vandenberg.af.mil>
Date: Sun, 13 Apr 2003 05:15:04 -0000
X-Message-Number: 2
We've seen a lot of anecdotal evidence on this list of TXD problems. I
don't know that 3-4 times is normal, but I'd say at least double is common.
Truth is, most people probably never change it from the default.
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Subject: Re: XASTIR not igating
<LYR30130-128438-2003.04.12-12.13.56--andrew.rich#bigpond.com@lists.tapr.org>
From: Andrew Rich <andrew.rich@bigpond.com>
Date: Sun, 13 Apr 2003 15:25:47 +1000
X-Message-Number: 3
Oh I thought XASTIR was like UI-view where you could gate positions to RF.
--
Andrew Rich <andrew.rich@bigpond.com>
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Subject: APRS MySQL
From: Andrew Rich <andrew.rich@bigpond.com>
Date: 13 Apr 2003 15:45:43 +1000
X-Message-Number: 4
Gents, I have lotsa APRS data in my MySQL linux machine.
If I wanted to re-broadcast to my laptop, do you just need to put a right
curly bracket out the front of the packet data ?
I want to trick the laptop it is listening to igated traffic, over a serial
link.
I am downloading the spec, but I have a slow link.
VK4TEC> RELAY,WIDE:} <PACKET GOES HERE>
I think thats all I have to do ?
Cheers thanks in advance Andrew VK4TEC
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Subject: RE: APRS Multi Line
From: Bob Bruninga <bruninga@usna.edu>
Date: Sun, 13 Apr 2003 08:48:52 -0400 (EDT)
X-Message-Number: 5
On Sat, 12 Apr 2003, Miller Scott Contr 30SCS/FTI wrote about multiple
posits in one packet:
>... Though I suppose you could trick terminal mode systems by sticking a
>carriage return at the end of the first posit and faking a terminal mode
>header to start the next. Just... sending multiple AX.25 frames
>back-to-back. The header overhead adds a bit, especially with a big
>path, but at least it's not going to confuse anything.
Yes, and the additional headers don't need any path nor any TXD delay
THus in one packet you could send probably 6 or more posits in compressed
format:
WB4APR>APRS,WIDE2-2:!/xxxxyyyyCST
ONE>AP:!/XXXXYYYYcst$
TWO>AP:!/xxxxyyyyCST$
ETC>AP:!/XXXXYYYYcst$
Bob, WB4APR
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Subject: OT:schematic help?
From: "Wes Johnston" <wes@johnston.net>
Date: Sun, 13 Apr 2003 10:40:02 -0400
X-Message-Number: 6
I have a newish sony DV camcorder which uses a 1/8" headphone jack for a/v
input (the same on as a JVC too). Anyone know which of these pins is video?
I've lost my cable. Is this plug longer than a stereo plug? What I'm
hoping for is that the plug is physically the same length, and the tip is
used for video so I can just use a stereo headphone jack.... I'm not
interested in audio for my application.
Thanks.
Wes
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Subject: Re: findU2 down
From: Bob Bruninga <bruninga@usna.edu>
Date: Sun, 13 Apr 2003 11:43:59 -0400 (EDT)
X-Message-Number: 7
On Sat, 12 Apr 2003, Guy Story, KC5GOI wrote:
>Once again, we were not aware of this event and I no longer have time to
>watch each and every email that goes through the APRSSIGs to watch for
>every event that may be happening.
This is a problem we have wanted to solve for years. What we need is
someone to write an APRS-SCHEDULE WEB page so that users can self-log
upcoming events. None of us can keep track of it all. For years, I
tried to keep an updated events calandar, but APRS is just too vast to
keep up with manually.
So here is what we need someone to do with a WEB page:
1) It presents to users a time-sequenced schedule of events.
2) It allows people to post schduled events and to list a point of
contact and a WEB page link.
3) It sorts daily and puts old events in a HIstory link.
Anyone?
Bob, WB4APR
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Subject: RE: APRS Multi Line
From: Jeff King <jeff@aerodata.net>
Date: Sun, 13 Apr 2003 14:13:51 -0400
X-Message-Number: 8
Jim:
The default on the TNC1 was 140ms. I never had a problem getting into a digi,
running open squelch (as everyone should) to respond to this. This was 15+
years ago. Radios are much better now, the Kenwood "APRS" radios work in the
70-80ms range on TXD (per Bill Diaz tests). This is excellent for a 1200 baud
AFSK radio.
Yet, I'm told the default TXD's on these very same radios is 500ms. Taking
the optimal times for TXD (see below) and comparing it to this, is how I got
my factor. I typically run a TXD of 120ms (with my 15 year old Kenwood 7950).
The "optimal TXD" is the time it takes your radio's PLL to lock up (and hence
begin transmitting) + the time of a few AX.25 flags (figure another 30ms for
this). You want TXD to be right around this figure. This is the optimal TXD.
It is different for every radio, but if you find your are having to run over
150ms to get into your local digi, either something is wrong with your radio
or the local digi.
73
--
Jeff King, jeff@aerodata.net on 04/13/2003
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Subject: Re: findU2 down
From: Jeff King <jeff@aerodata.net>
Date: Sun, 13 Apr 2003 14:50:16 -0400
X-Message-Number: 9
On Sun, 13 Apr 2003 11:43:59 -0400 (EDT), Bob Bruninga wrote:
>On Sat, 12 Apr 2003, Guy Story, KC5GOI wrote:
>
>>Once again, we were not aware of this event and I no longer have time to
>>watch each and every email that goes through the APRSSIGs to watch for
>>every event that may be happening.
>
>This is a problem we have wanted to solve for years. What we need is
>someone to write an APRS-SCHEDULE WEB page so that users can self-log
>upcoming events.
http://www.eham.net/calendar/
I'm sure if you asked nicely, he would add a event type of "APRS".
-Jeff
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Subject: RE: APRS Multi Line
From: dale huguley <kg5qd@wxsvr.net>
Date: Sun, 13 Apr 2003 16:05:24 -0400
X-Message-Number: 10
Bob Bruninga wrote:
>Yes, and the additional headers don't need any path nor any TXD delay
>THus in one packet you could send probably 6 or more posits in compressed
>format:
>
>WB4APR>APRS,WIDE2-2:!/xxxxyyyyCST
>ONE>AP:!/XXXXYYYYcst$
>TWO>AP:!/xxxxyyyyCST$
>ETC>AP:!/XXXXYYYYcst$
>
>Bob, WB4APR
>
>>-----Original Message-----
>>From: Andrew Rich
>>To: TAPR APRS Special Interest Group
>>
>>Has anyone ever thought of a high density more than one posit on a line
>>protocol for APRS ?
WXSVR has been transmiting mutiple positions in a single packet for
close to a year- for watch boxes etc. Xastir does a good job of
decoding then.
The format allows up to 26 positions in a 80 character packet.
73 de kg5qd Dale
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Subject: RE: OT:schematic help?
From: Miller Scott Contr 30SCS/FTI <Scott.Miller@vandenberg.af.mil>
Date: Sun, 13 Apr 2003 20:07:39 -0000
X-Message-Number: 11
I've got a DCR-TRV900, and it's not a standard stereo plug - it's got an
extra conductor. I just went down to xxxxxxxx and picked up a $x cable that
worked just fine. According to my voltmeter, the video sheild is the second
ring (counting from the base of the connector), and the video center pin is
the third ring.
I've got a tiny $40 CMOS video camera stuck to my paintball mask that I can
connect to the camcorder in my backpack, so the $1400 camcorder doesn't get
shot at. =] I've also got an identical camera stuck in a 1" camera port on
my microscope, but if I'm recording it's usually going straight to the
computer. I'd love to find an adapter to hook the camcorder up to the
microscope, though.
Can't wait to try a weekend long paintball scenario game using APRS for a
poor man's Land Warrior. =]
Scott
N1VG
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