| |
ZL3AI > APRDIG 21.06.03 20:18l 279 Lines 9680 Bytes #999 (0) @ WW
BID : 1501-ZL3AI
Read: GUEST
Subj: TAPR Digest, Jun 17, 1/5
Path: DB0FHN<DB0RGB<DB0FSG<DB0GAP<DB0KFB<DB0CZ<DB0GE<DB0ZDF<DB0CWS<DB0SIF<
DB0EA<DB0RES<ON0AR<LU6DTS<W4JAX<VK4TUB<ZL2BAU<ZL3VML
Sent: 030619/1327Z @:ZL3VML.#80.NZL.OC #:2717 [Chch-NZ] FBB7.00i $:1501-ZL3AI
From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Tuesday, June 17, 2003.
1. Re: Field Day Water Power
2. Re: assilimation complete
3. Tiger/Line Data Map Viewer
4. Re: Field Day Water Power
5. Re: Field Day Water Power
6. Re: Field Day Water Power
7. Re: PIC accessory for Mobile APRS
8. Re: PIC accessory for Mobile APRS
9. Re: Field Day Water Power
10. Re: Field Day Water Power
11. Re: Field Day Water Power
12. Subject: Re: GPS Data to APRS+SA - was GPS DATA TO WinAPRS
13. Re: PIC accessory for Mobile APRS
14. Re: Field Day Water Power
15. Re: Tiger/Line Data Map Viewer
16. Re: Field Day Water Power
17. Re: aprssig digest: June 15, 2003
18. Garmin GPS/FRS combo
19. Re: Field Day Water Power
20. Re: Field Day Water Power
21. APRS Power Point Presentation?
22. Satellite pass prediction and STK
23. Re: APRS Power Point Presentation?
24. Re: Field Day Water Power
25. Re: Field Day Water Power
26. Re: Field Day Water Power
27. Re: Field Day Water Power
28. Re: Field Day Water Power
29. Re: Field Day Water Power
30. Re: Field Day Water Power
31. Re: Field Day Water Power
32. Re: Field Day Water Power
33. RS 5/8 wave mag mount
34. Re: Field Day Water Power
35. Re: Field Day Water Power
36. Re: RS 5/8 wave mag mount
37. Etak Skymap 2000
----------------------------------------------------------------------
Subject: Re: Field Day Water Power
From: "Doug Younker" <dougy@ruraltel.net>
Date: Mon, 16 Jun 2003 23:47:13 -0500
X-Message-Number: 1
It is my understanding that the pumps on the newer machines ate powered by a
DC motor.--73
Doug, N0LKK
dougy@ruraltel.net
----------------------------------------------------------------------
Subject: Re: assilimation complete
From: Steve Dimse <k4hg@tapr.org>
Date: Tue, 17 Jun 2003 06:39:36 -0400
X-Message-Number: 2
On 6/16/03 at 10:40 PM wes@johnston.net (Wes Johnston) sent:
>I went to mapblast tonight, and the familiar user interface has been changed
>to MS forever.
I don't see anything that has changed in the last two months...it was about
then that they began redirecting the mapblast domain to mappoint. If it is
this redirection you are talking about, this has indeed been going on for a
while.
So far the original map server used by findU is still up on vicinity.com,
but who knows how long this will remain. My guess is they have customers
that rely on this interface, just as findU does, to provide external
services. I expect it won't be long until they get migrated to Microsoft's
products, and this goes away...that will be a sad day for findU, as there
is nothing that can really replace it. There are some US-only sites I can
change to, but nothing that will help the other half of my users.
Steve K4HG
----------------------------------------------------------------------
Subject: Tiger/Line Data Map Viewer
From: "Jason Rausch" <ke4nyv@msn.com>
Date: Tue, 17 Jun 2003 7:29:13
X-Message-Number: 3
Does anyone know of a good, FREE viewer for the Tiger/Line Data OTHER than
WinAPRS?
Thankx, 73's
Jason KE4NYV
www.ke4nyv.com
----------------------------------------------------------------------
Subject: Re: Field Day Water Power
From: Bob Bruninga <bruninga@usna.edu>
Date: Tue, 17 Jun 2003 08:36:29 -0400 (EDT)
X-Message-Number: 4
To clarify some things about my Field Day water power post.
The Pump in a washing machine is a low pressure high volume centrifugal
pump and will work very well with a low pressure high volume flow as a
turbine running backwards. The "pump" is only the pump with a pulley.
It needs to be belted to a suitable generator/alternator with a proper
mechanical ratio to match the pump torque speeds to the optimum
torque-speed requirements of the generator.
Apparently there are many off-the-shelf products in the $600 to $4000
price range that do just this. But that takes all the fun out of it.
The spiral vanes in a centrifugal pump are designed to "sling" the water
outward very efficiently, hence, a pump. But feed water through it
backwards and you end up with the water hitting the blades at right
angles. This, more-or-less, is exactly what you want in a turbine.
To get the power to the FD site (higher up the valley), its best to
generate power at as high a voltage as you can to minimize line loss or
wire size. THen use the typical DC/DC power supplies to drop it back down
for the 12 volt Field Day system on top of the hill.
Last post unless I get somethign working...
Bob, WB4APR
----------------------------------------------------------------------
Subject: Re: Field Day Water Power
From: "Mike Yetsko" <myetsko@insydesw.com>
Date: Tue, 17 Jun 2003 08:49:09 -0400
X-Message-Number: 5
>The spiral vanes in a centrifugal pump are designed to "sling" the water
>outward very efficiently, hence, a pump. But feed water through it
>backwards and you end up with the water hitting the blades at right
>angles. This, more-or-less, is exactly what you want in a turbine.
Hmm, if the power (potential energy in the water pressure) is free, then I
suppose it doesn't matter, but the efficiency will be low due to the fact
that the water will have to 'exit' at the center.
But as I said, if the energy is free, who cares.
I wonder... If you broke open the pump and let the water just splash
away...
Mike
----------------------------------------------------------------------
Subject: Re: Field Day Water Power
From: "Robert Wood" <rwwood47@hotmail.com>
Date: Tue, 17 Jun 2003 08:41:39 -0500
X-Message-Number: 6
Well,
Search Mode -- Type in: "Water Wheel turbine" and voila- worlds of info from
6" to 12 FT turbine, Water wheels, etc... Just what the inventor wanted..
Good Building!!
73's
K8agh
----------------------------------------------------------------------
Subject: Re: PIC accessory for Mobile APRS
From: Paul Jacques <paulj@rain.org>
Date: Tue, 17 Jun 2003 06:52:17 -0700
X-Message-Number: 7
I can see getting the your current position directly from the GPS but I
didn't see any D700 commands that would enable you to retrieve the
frequency from the B Band. In fact, looking at the D700 commands, it
appears that none of the commands request a return of anything from the
D700. The commands are used to setup the D700 and none even include
setting it to a frequency. I can see how to set the APRS status message
though. Anybody know something more?
Paul
WB6IWT
----------------------------------------------------------------------
Subject: Re: PIC accessory for Mobile APRS
From: Robbie <mwrobertson@attbi.com>
Date: Tue, 17 Jun 2003 09:34:39 -0500
X-Message-Number: 8
Paul et all,
A long while back, some one listed ALL commands that the KW D-700 would
respond to over the serial port while the D-700 was not in TNC mode. One
of these commands was to instruct the radio to go to a specific
frequency, and other command to turn on the TNC to either mode..
Wish I could find that list again or the cool program the fellow wrote
to use those commands, :-)
Robbie, wa9inf
----------------------------------------------------------------------
Subject: Re: Field Day Water Power
From: Bob Bruninga <bruninga@usna.edu>
Date: Tue, 17 Jun 2003 10:52:16 -0400 (EDT)
X-Message-Number: 9
On Tue, 17 Jun 2003, Mike Yetsko wrote:
>Hmm, if the power (potential energy in the water pressure) is free, then
>Isuppose it doesn't matter, but the efficiency will be low due to the
>fact that the water will have to 'exit' at the center.
Ah, but the ideal exit is at the center and with 0 velocity and 0
pressure. That is the point, to extract all of the kinetic energy
from the water... so there is as close to nothing left.
----------------------------------------------------------------------
Subject: Re: Field Day Water Power
From: "Mike Yetsko" <myetsko@insydesw.com>
Date: Tue, 17 Jun 2003 10:56:54 -0400
X-Message-Number: 10
>On Tue, 17 Jun 2003, Mike Yetsko wrote:
>
>>Hmm, if the power (potential energy in the water pressure) is free, then
>>I suppose it doesn't matter, but the efficiency will be low due to the
>>fact that the water will have to 'exit' at the center.
>
>Ah, but the ideal exit is at the center and with 0 velocity and 0
>pressure. That is the point, to extract all of the kinetic energy
>from the water... so there is as close to nothing left.
Yes, but to exit at the center of a spinning disk...
If it were ideal, you would squirt the water at the vanes, and the water
would shed the energy and fall directly downward, out of the way... Hmm,
or even bounce back in a rebound but miss the other vanes as it falls!
Oh oh, back to physics class!
Mike
----------------------------------------------------------------------
Subject: Re: Field Day Water Power
From: Bob Bruninga <bruninga@usna.edu>
Date: Tue, 17 Jun 2003 11:29:46 -0400 (EDT)
X-Message-Number: 11
On Tue, 17 Jun 2003, Mike Yetsko wrote:
>>Ah, but the ideal exit is at the center and with 0 velocity and 0
>>pressure. That is the point, to extract all of the kinetic energy
>>from the water... so there is as close to nothing left.
>
>Yes, but to exit at the center of a spinning disk...
Exactly. Impinge the energy on the vanes so they spin and decelerate the
water to zero velocity which is the cener of the disk where it just falls
out the bottom..
>If it were ideal, you would squirt the water at the vanes, and the water
>would shed the energy and fall directly downward, out of the way...
>Hmm, or even bounce back in a rebound but miss the other vanes as it
>falls!
Yep, thats exactly what happens. And that's why it falls out the
center... with minimum emergy...
----------------------------------------------------------------------
Read previous mail | Read next mail
| |
