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ZL3AI > APRDIG 21.06.03 19:53l 260 Lines 9813 Bytes #999 (0) @ WW
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: import raw data
From: Miller Scott Contr 30SCS/FTI <Scott.Miller@vandenberg.af.mil>
Date: Mon, 16 Jun 2003 17:17:02 -0000
X-Message-Number: 11
I think he's talking about plotting past data. APRS-IS history feeds only
provide the last known position for a station, right?
Do any of the APRS clients support SQL queries against FINDU or APRSWORLD?
Scott
N1VG
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Subject: Re: import raw data
From: "Curt Mills, WE7U" <hacker@tc.fluke.com>
Date: Mon, 16 Jun 2003 10:19:56 -0700 (PDT)
X-Message-Number: 12
On Mon, 16 Jun 2003, Phil Pacier, AD6NH wrote:
>On 06/15/03, ""Joe Della Barba" <joe@dellabarba.com>" wrote:
>>Is there any way to take the raw data from FINDU and have APRS+ read it and
>>plot the positions?
>
>How would this be any different from connecting to one of the APRS internet
>servers?
We have such a feature in Xastir: You can enter a callsign/SSID,
and can request up to the last two weeks of posits for that station
from Findu. When the data comes in, the entire track gets drawn for
the time period requested.
I use it sometimes for checking my commute track. Also use it to
check on friends to see how well their trackers are working.
--
Curt Mills, WE7U hacker_NO_SPAM_@tc.fluke.com
Senior Methods Engineer/SysAdmin
"Lotto: A tax on people who are bad at math!"
"Windows: Microsoft's tax on computer illiterates!" -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
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Subject: Re: import raw data
From: "Steve Dimse" <k4hg@tapr.org>
Date: Mon, 16 Jun 2003 17:22:16 +0000
X-Message-Number: 13
On Mon, 16 Jun 2003 11:54:24, Phil Pacier, AD6NH wrote
>On 06/15/03, ""Joe Della Barba" <joe@dellabarba.com>" wrote:
>>Is there any way to take the raw data from FINDU and have APRS+ read it and
>>plot the positions?
>>Thanks,
>>Joe Della Barba
>>73 de N3HGB-5
>
>How would this be any different from connecting to one of the
>APRS internet servers?
The parsing is the same, but the input comes from a different place. You
can cut the raw text, paste it into a file, and then open the file with
Mac/WinAPRS, someone familiar with APRS+SA would have to say if it can do
that, but I assume so.
It also would be possible for the program to directly request the page, and
act on the data. Xastir does it this way, I've never heard of any other
clients doing it, but I'm sure if I'm wrong someone will correct me!
Finally, a program could directly interface with findU's mysql database, no
clients do this presently (a couple of other web sites access the data
directly though).
Steve K4HG
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Subject: Re: Field Day Water Power
From: Miller Scott Contr 30SCS/FTI <Scott.Miller@vandenberg.af.mil>
Date: Mon, 16 Jun 2003 17:32:13 -0000
X-Message-Number: 14
Ok, so I was off by an order of magnitude. The Pelton wheels at Hoover Dam
produce 2.4 megawatts each.
http://www.usbr.gov/lc/hooverdam/History/powerfaq.html
Anyway, the point I was trying to make is that you're probably going to be a
lot better off using a purpose-designed generator than trying to adapt
something like a washing machine pump.
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Subject: Re: Field Day Water Power
From: "Curt Mills, WE7U" <hacker@tc.fluke.com>
Date: Mon, 16 Jun 2003 10:56:47 -0700 (PDT)
X-Message-Number: 15
I believe you can modify car alternators to turn them into
reasonable generators as well. They're readily available. Not sure
I'd want to lug one of those with me on a hike though. They might
have some without permanent magnets in them, but then I guess you'd
need a battery to get them started making juice.
--
Curt Mills, WE7U hacker_NO_SPAM_@tc.fluke.com
Senior Methods Engineer/SysAdmin
"Lotto: A tax on people who are bad at math!"
"Windows: Microsoft's tax on computer illiterates!" -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
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Subject: Re: Field Day Water Power
From: Miller Scott Contr 30SCS/FTI <Scott.Miller@vandenberg.af.mil>
Date: Mon, 16 Jun 2003 18:06:07 -0000
X-Message-Number: 16
Came across this the other day.
http://theepicenter.com/tipoweek.html
It doesn't say anything about turbines, but it shows you how to use an
alternator as a charger. And how to convert small engines for propane use.
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Subject: Re: Field Day Water Power
From: "Mark Fellhauer" <sparkfel@qwest.net>
Date: Mon, 16 Jun 2003 14:03:06 -0500
X-Message-Number: 17
At 12:56 PM 6/16/2003, Curt Mills, WE7U wrote:
>I believe you can modify car alternators to turn them into
>reasonable generators as well. They're readily available. Not sure
>I'd want to lug one of those with me on a hike though. They might
>have some without permanent magnets in them, but then I guess you'd
>need a battery to get them started making juice.
Somebody correct me if I'm wrong, but don't all Claw Pole (Lundell)
alternators require a field to start making electricity? I wasn't aware
that any OEM automotive style alternators made in about the last 40 years
had permanent magnets in them... I've seen PM alternators in motorcycles
and maybe some goofy military vehicles...
Mark
KC7BXS
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Subject: Micro-hydro for APRS / Field Day
From: John Kraus <flyfisher452@cox.net>
Date: Mon, 16 Jun 2003 15:40:15 -0400
X-Message-Number: 18
Bob and the SIG,
Here is a direct link to a file about small scale or as it is otherwise
known Micro-hydro. It has a good picture of the turgo runner type of water
wheel.
http://www.homepower.com/files/hp67-68.pdf
The base site also offers an outstanding resource on alternative energy.
Richard Perez the founder of Home Power magazine is a ham N7BCR. Best of
all the entire magazine is available in PDF for free download.
http://www.homepower.com
In reference to Bob's original question I suspect that what he wants to do
is possible but with the availability of flexible solar panels I doubt that
it would be a good first choice. There is considerable infrastructure to
build in order to harness water power. Carrying all the pipes and other
stuff would be a real drag. I suspect that solar would be much easier and
it doesn't run the risk of running afoul of some arcane federal regulation.
Many streams fall under various government regulations so it is wise to be
careful.
I think the Uni-solar flexible panels would be a much more versatile setup
for a man portable APRS station. For a fixed site field day larger panels
could easily keep up with a 50 watt digi or HF station. It is only
necessary to do a proper load analysis and size the battery bank to carry
you through the dark then size the array to return sufficient power during
daylight.
I would very much like to hear details of alternative energy powered APRS
sites / stations. I think this is a very neglected are of both APRS and
ham radio in general. Remote APRS digis are prime candidates for solar
power or other forms of alternative energy.
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Subject: Re: Field Day Water Power
From: "Richard Amirault" <ramirault@erols.com>
Date: Mon, 16 Jun 2003 18:13:16 -0400
X-Message-Number: 19
1. Why would you need to run the water pump "backwards"?? I suppose it
depends on how the "vanes" are shaped. If they are flat it seems like it may
make no difference in efficiency.
2. Many hydro power set-ups just use the force of a running stream, not a
drop of xx ft from a height. Of course then you need to submurse some sort
of wheel into the water as opposed to running pipe. A lot depends on how
fast the stream is moving. A slow moving stream still can provide
significant energy at a dam. While a fast moving stream can provide it most
anyplace..
Richard Amirault N1JDU Boston,
MA, USA
www.erols.com/ramirault "Go Fly A Kite"
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Subject: Garmin GPS/FRS RINO Decoding
From: Bob Bruninga <bruninga@usna.edu>
Date: Mon, 16 Jun 2003 19:31:22 -0400 (EDT)
X-Message-Number: 20
Here is more data on decoding the Garmin FRS radio with built-in GPS:
We need help...
What is sounds like: http://www.ew.usna.edu/~bruninga/rino1.wav
(The first burst is a PTT Kerchunk to get it to transmit a posit...)
(The second bust is the data)
What it looks like in EXCEL:
http://www.ew.usna.edu/~bruninga/RinoT.xls
I took this with a digital O-scope capture. Here is what I determined:
1) There are 5 "sync" bytes at the beginning lasting 6.5 ms
2) If each "byte" is assumed as 8 bits, then this is 4800 baud
3) My total capture was 202 ms and it was still going
4) In 202 ms, I captured about 121 bytes
5) about 35 of them in the middle are identical
6) The 10 byte NAME field for my RINO contained the word "BABS______"
7) The RINO was indoors so no GPS LOCK. (probably the 35 bytes of 0's)
Since this turned out to be 4800 baud that I was receiving through the
speaker, the low pass filtering of the audio amp probably rolled off the
individual bits making this capture useless other than the gross
observations above.
This will also apply to the WAV recording as well. What we need is
someone a lot better equiped than I to take the raw signal off the air and
do some magic...
Any takers?
Bob
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