| |
ZL3AI > APRDIG 22.06.03 08:49l 328 Lines 12194 Bytes #999 (0) @ WW
BID : 1508-ZL3AI
Read: GUEST
Subj: TAPR Digest, Jun 18, 3/3
Path: DB0FHN<DB0RGB<DB0MRW<OK0PKL<OK0PPL<DB0RES<ON0AR<VK6HGR<ZL2BAU<ZL3VML
Sent: 030620/1401Z @:ZL3VML.#80.NZL.OC #:2774 [Chch-NZ] FBB7.00i $:1508-ZL3AI
From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: APRS and MARS
From: Bob Bruninga <bruninga@usna.edu>
Date: Wed, 18 Jun 2003 17:13:29 -0400 (EDT)
X-Message-Number: 19
Navy/Marine Corps and ARMY/AF MARS:
Was talking to a MARS operator today about getting MARS operations out of
the 1950's and up to fully tactical situational communications awareness.
(remember the IRAQ War where every unit was GPS mobile?)
We need a MARS version of the APRS-Internet system.
But to demonstrate this capability, I propose the following overnight
demonstration network:
1) Everyone that is associated with MARS and is also on APRS, put your
MARS callsign in your packet somewhere. Then we can use AFILTER to filter
the APRS-IS feed and thus have a MARS only feed.
2) EASY place to put this is in the DIGI field! Just make the LAST digi
in your DIGI PATH be your NNN#??? callsign. How? Easy...
Make it NNNABC-0 which is a valid AX.25 callsign representing NNN0ABC
ANother example would be NNNXYZ-5 which would be NNN5XYZ.
Now, show your MARS boss that we have a Tactical Situational Awareness
system for MARS. And lets get moving! Just download the right software,
give them Government PC's (millions of them surplus) and go...
Set your filter on AFLITER to ,NNN and you will get everyone.
I dont have time to spearhead this project, but maybe someone else in MARS
does. You will have to write it all up and get MARS on board. You will
have to prepare a "HOW-TO" setup set of instructinos too...
Later if this works, we can migrate to a dedicated all DOD sponsored and
supported internet system and move off from the APRS-IS... But you have
to show them something first to get them motivated...
de WB4APR@amsat.org, Bob
PCsat WEB page http://www.ew.usna.edu/~bruninga/pcsat.html
ISS-APRS FAQ: http://www.ew.usna.edu/~bruninga/iss-faq.html
CUBESAT Designs http://www.ew.usna.edu/~bruninga/cubesat.html
APRS LIVE pages http://www.ew.usna.edu/~bruninga/aprs.html
APRS SATELLITES http://www.ew.usna.edu/~bruninga/astars.html
MIM/Mic-E/Mic-Lite http://ssdl.stanford.edu/mims/
----------------------------------------------------------------------
Subject: Re: Water Power
From: David VanHorn <dvanhorn@cedar.net>
Date: Wed, 18 Jun 2003 16:05:56 -0500
X-Message-Number: 20
At 04:51 PM 6/18/2003 -0400, WB4GQK@aol.com wrote:
>I have been reading all the various msgs regards using water power for field
>day. I finally felt I needed to insert my 2 cents.
>
>Many years ago when my XYL and I were cruising the Caribbean we encountered
>another cruising couple who employed a device that they lowered overboard and
>trailed astern.
http://www.sailnet.com/collections/gearandmaintenance/index.cfm?articleID=jeffr0
e020%20%20
----------------------------------------------------------------------
Subject: Re: Water Power
From: David VanHorn <dvanhorn@cedar.net>
Date: Wed, 18 Jun 2003 16:12:31 -0500
X-Message-Number: 21
A little more googling: http://www.ampair.com/
----------------------------------------------------------------------
[commercial content deleted]
----------------------------------------------------------------------
Subject: RE: N-N protocol question and gating NWS warning questions
From: "AE5PL Lists" <HamLists@ametx.com>
Date: Wed, 18 Jun 2003 16:42:19 -0500
X-Message-Number: 23
See below...
>-----Original Message-----
>From: Sean \The RIMBoy\ [mailto:sean@rimboy.com]
>Posted At: Wednesday, June 18, 2003 4:22 PM
>Subject: [aprssig] N-N protocol question and gating NWS
>warning questions
>
>Now, does anyone have a good way to determine what station is
>gating to RF NWS warnings? Someone in our area is doing it,
Simply look at either the FROM call in the path (before your software
parses the message) or the callsign following TCPIP* in the third-party
header. They should be the same and should be the callsign of the
station gating to RF.
>The final question is, is there any way to add an UNPROTO
>path to an NWS
>statement gated to RF? In theory, it should just be a matter
That would depend on the software being used as an IGate. APRS+SA sets
a single path for all gated traffic (which might fit with what you are
doing). I can't speak for the others. javAPRS is a web GUI only and
has no TNC interface capability.
73,
Pete Loveall AE5PL
pete@ae5pl.net
----------------------------------------------------------------------
Subject: Re: Water Power
From: psschwarz@kellnet.com
Date: Wed, 18 Jun 2003 22:18:48 GMT
X-Message-Number: 24
There ya have it. Not only is it wind-powered, but it is a variable speed
wind/gas-powered antenna rotator, too. :-) Have any yagis on your boat? :-)
Patrick...KB8RTZ...
WB4GQK@aol.com writes:
SNIP...
>Four years ago I had a BOW THRUSTER installed.
>Obviously I enjoyed reading about this subject
>73 de
>Jim
----------------------------------------------------------------------
[commercial content deleted]
----------------------------------------------------------------------
Subject: Re: New RINO data.
From: Bob Bruninga <bruninga@usna.edu>
Date: Wed, 18 Jun 2003 18:15:27 -0400 (EDT)
X-Message-Number: 26
We have now located the Callsign Field in the RINO data burst. But still
don't understand the waveform and modulation... If you have any
knowledge of digital waveforms, take a look and help us out..
http://www.ew.usna.edu/~bruninga/APRSrino.html
We add new information daily...
>On Tue, 17 Jun 2003, Byon Garrabrant wrote:
>
>>10111100 10011111 01100010 00100111 10011101 01010101
>>?1000110 01101100 10010011 11001111 10111000 10101111
>>11111111 11111111 11111111 11111111 11111111 11110000
>>11010110 01110110 10100000
Then we figured out that...
>Yes, All the ONES are the 8 null characters in the name. I changed the
>name to ABCDEFGHIJ and they all changed. New file uploaded to the web
>page:
>
> http://www.ew.usna.edu/~bruninga/APRSrino.html
>
>Ball's back in your court...
>
>Bob
----------------------------------------------------------------------
Subject: Re: New RINO data.
From: David VanHorn <dvanhorn@cedar.net>
Date: Wed, 18 Jun 2003 17:30:06 -0500
X-Message-Number: 27
At 06:15 PM 6/18/2003 -0400, Bob Bruninga wrote:
>We have now located the Callsign Field in the RINO data burst. But still
>don't understand the waveform and modulation... If you have any
>knowledge of digital waveforms, take a look and help us out..
Sixels is a fairly standard way to encode caps and numerics only.
We used that for credit card data years ago. 6 bits
You might try changing only one bit at a time, like ABC to ABD and see what
changes.
There may be checksums or FEC involved as well, which would make it pretty
difficult to reverse engineer. If you get big changes for incremental
changes in the data, then that's what I'd suspect.
----------------------------------------------------------------------
[commercial content deleted]
----------------------------------------------------------------------
Subject: RE: assilimation complete
From: "Bob D." <n2iph@comcast.net>
Date: Wed, 18 Jun 2003 19:30:02 -0400
X-Message-Number: 29
>I went to mapblast tonight, and the familiar user
>interface has been changed to MS forever.
Yeah, I noticed that the other day when I went there to use MapBlast.
Fits right in with the MS business model;
"If you can't beat ;em ... BUY THEM!"
MS bought Automap years ago, that became the basis of MS Map,
which evolved into MS Streets.
----------------------------------------------------------------------
Subject: Re: Field Day Water Power
From: "Bob D." <n2iph@comcast.net>
Date: Wed, 18 Jun 2003 19:59:31 -0400
X-Message-Number: 30
Water Wheel Engineering
http://www.rosneath.com.au/ipc6/ch08/shannon/
Turbines, Waterwheels, Pelton wheels, more.
Search Google on 'build a pelton wheel' for 1000+ hits.
----------------------------------------------------------------------
Subject: FD Wind Power. The rest of the story...
From: Bob Bruninga <bruninga@usna.edu>
Date: Wed, 18 Jun 2003 21:50:17 -0400 (EDT)
X-Message-Number: 31
Just so you dont think I am crazy, I'll remember my first Windmill
design... (and you'll love the rest of the story!)
It was a 1.5 Kw 2 blade prop design using a truck alternator and the rear
axle and differential from a Japanese car as the horizontal shaft, and
gearing system (back in 1972)..
I designed it from scratch using the Mechanical ENgineers' handbook for a
tip speed ratio of 8 to 1 with a constantly varying airfoil and pitch from
tip to hub. To get the exact shape I wanted, I laminated the 10 foot prop
from 21 layers of 1/4" plywood and then used a belt sander to make a prop
that not only was perfect as far as maximum efficiency was concerned, but
also would look nice hanging over my fire place after all the fun. I
stained it golden oak. It was a beaut.
Well, it was more fun than that! Since I was on sea duty at the time in
Japan, it took a month or more before I was able to be in port at the
right time when the wind was blowing. It was about 25 MPH and that should
have driven it to 1.5 Kw. This was during my lunch hour and I was in
dress blues. I climbed my 10 foot tower which was on top of a world war
II bunker on base in Sasebo Japan and because I had pre-attached the prop
to the axle, all I had to do was just slide it in place into the
differential.
Well, it started up slowly at first, but they you could just hear it
suck-up into the wind as it approached design speed. It sounded like
being 5 feet from a full pwer Helocopter! Now I had not "balanced" it
yet, and so the vibration was scary.. SO I figured, no problem, Ill just
swing it perpendicular to the wind. Duh....
Since I was using the forward pressure of the wind to hold the shaft
jammed into the rear axel (since it was only a short test, I had not put
any of the bolts in place)... bringing the helocopter sounding whirling
blade sideways into the wind now made its inertia act like a Propeller and
now the force was to pull it OUT of the axle. SO I put it back into the
wind to try to get it back in place, but it just kept accellerating...
Well, to make a long story short, I jumped off the tower as far as I
could at about the same time that the 10 foot prop running at top speed
left the axle. As I looked back, it flew several feet and dug a small
hole in the ground and snapped off two feet of one blade.. There was an
enlisted guy smoking dope behind a tree that was watching all this and his
only comment was "...far out man!"...
Now it hangs in my shop as a reminder of what 1.5 kW of wind power is all
about.
But still being enamored with natural power, 10 years later I built
another one, but this one only 3 feet across. Again, laminated it out of
a dozen layers of plywood to get the perfect continuously variable airfoil
and pitch from tip to hub. I attached it to a rare-earth DC generator and
this time built an AUTO-TILT-High speed breaking system BEFORE my first
test.
This 2 blade wind turbine has worked well since about 1982, though it has
really only been used twice at Field Day and a few times teaching the
Boy Scout Energy Merit badge.
Of course, at that field day (15 years ago) I had it up at about 20 feet
on a temporary mast. But in the middle of Field Day I got an emergency
call from my wife and had to leave the site for a few hours. Luck would
have it that in that time, a "microburst" arose, and blew the windmill
over, and that, like dominows took down the 50 foot tower as well, when it
severed one of the guy ropes to that tower. That was a 50 foot one-hand
pull up lovingly made out of 20 foot concentric sections of lightweight
aluminum irrigation piping.. (but thats another story)...
So anyway, I fully understand about the engineering and efficient design
of props, air foils, variable pitch and all that. Though I admit
that I have not applied these principles to water pumps as fully yet...
One other thing I appreciate is the danger of working even with only 25
watts of Wind power. It can cut your arm off... Thats one reason I think
water will be more fun in the summer and less risk!.... ;-)
de WB4APR@amsat.org, Bob
---
END OF DIGEST
Read previous mail | Read next mail
| |
