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ZL3AI > APRDIG 09.12.03 09:41l 252 Lines 9470 Bytes #999 (0) @ WW
BID : 2450-ZL3AI
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Subj: TAPR Digest, Dec 04, 5/7
Path: DB0FHN<DB0RGB<DB0MRW<OK0PKL<OK0PPL<DB0RES<ON0AR<LU6DTS<ZL2TZE<ZL3VML
Sent: 031209/0721Z @:ZL3VML.#80.NZL.OC #:14234 [Chch-NZ] FBB7.00i $:2450-ZL3AI
From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: NMEA at >100,000 feet
From: "Scott Miller" <scott@opentrac.org>
Date: Thu, 4 Dec 2003 13:50:10 -0800
X-Message-Number: 28
>In earth orbit, objects in the sun can be at +250 F, while objects in
>the shade can be at -250 F. In deeper space, say on the surface of
>Mars you'd be lucky if the temperature at the equator on a hot
>summer's day got up to +70 F.
Here's an interesting quote on that from Cecil Adams:
"Polished aluminum will absorb sufficient heat to raise its temperature as
high as 850 degrees Fahrenheit; certain types of white paint, on the other
hand, absorb so little heat that their temperature may not get much
above -40 Fahrenheit, even in full sunlight. Parts of the space shuttle get
down to -180 to -250 degrees Fahrenheit. "
So that kid in 'Have Spacesuit, Will Travel' wasn't doing himself a favor by
polishing up his oxygen tanks, I guess...
Scott
N1VG
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Subject: D700 Problem
From: "WalterH" <walterh@k5wh.net>
Date: Thu, 4 Dec 2003 16:13:42 -0600
X-Message-Number: 29
FYI...
After a few years of outstanding service, my D700 has started a very
strange problem a couple days ago, and I wanted to see if anyone else has
seen this before.
Everything functions 100%, with the exception of the ability to transmit
it's APRS beacon while on the AUTO mode.
If I change it to the mode of PTT, it works fine, as long as I am
transmitting on the other side of the radio periodically.
And YES, the BCON is on, and valid GPS data is coming to radio, with the
GPS indicator flashing. And of course, the location is correct when you
press POS as well as watching the location showing up on my D7.
I did a FULL reset on the radio even, and the problem still exists.
Anyone seen this before ?
Thanks,
Walter/K5WH
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Subject: Re: D700 Problem
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 4 Dec 2003 18:16:11 -0500 (EST)
X-Message-Number: 30
If you are running Voice Alert, of course, you hear no audio... BUT the
SQUELCH knob still functions! Thus if you have bumped it open, then it
wont transmit because the channel is busy...
Check to see if BUSY is showing...
Bob
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Subject: Re: National Parks Digi Coverage (Rev 3)
From: James Smith <k9apr@sbcglobal.net>
Date: Thu, 04 Dec 2003 18:26:31 -0500
X-Message-Number: 31
Bob Bruninga wrote:
>Indiana Dunes 1,820,000 12 ?
Indiana Dunes is well covered by a local digi located in Michigan City
which is just a few miles from the State Park. Digi is located around
Hwy-421 and I-94... http://www.findu.com/cgi-bin/find.cgi?call=N9ZIP*
>Mamouth Cave 1,749,000 12 ?
I believe this park is well within range of Fred KF4QZN-1 or -2
digi...... http://www.findu.com/cgi-bin/find.cgi?call=KF4QZN*
--
73, James, K9APR
Chairman \ Coordinator
Tri-State APRS Working Group
http://www.tawg.org
mailto:k9apr@tawg.org
Run a APRS Website? Why not join the APRS Webring. http://www.tawg.org/join.htm
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Subject: RE: D700 Problem
From: "WalterH" <walterh@k5wh.net>
Date: Thu, 4 Dec 2003 17:35:21 -0600
X-Message-Number: 32
Thanks Bob..
That was the first thing I checked as well. But the squelch was fine.
I did the FULL RESET through the front panel, no change. Then hit the
red button on the radio itself momentarily, (soft reset) no change.
Did the FULL reset (holding the reset button on the radio in for 2
seconds) then it started working.
Very strange.. But problem solved...
Now the real PAIN of having to manually re-set up my PM modes, since
they don't get saved in the radio configuration backups.
"Read that as a COMPLAINT Kenwood") :)
Walter/K5WH
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Subject: Re: National Parks Digi Coverage (Rev 3)
From: "Kurt O. Jauss" <kf6hjo@earthlink.net>
Date: Thu, 04 Dec 2003 16:06:30 -0800
X-Message-Number: 33
As a mater of fact.... I have the RADIO/ TNC in my shack right now. It
was a real alligator. I am swapping out the TNC with a KPC-3 ver 8.2 ,
adding a weather station and a WXTRAKER so my TMD-700 will decode the
weather string. ;-)
It should be back up on the hill sometime around January. K6IXA-2
WA8LMF2@aol.com wrote:
><snip>
>
>>Yosemite 3,400,000 22 ?
>
>Situation here is WORSE than no digi...
>
>There is a defective digi covering this park. It beacons but won't repeat.
>Apparently the receiver is broken since it transmits beacons at regular
>intervals but won't respond to any one else's transmissions!
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Subject: Re: APRS WX Protocol Questions
From: Ralph Milnes <ralphmilnes@patmedia.net>
Date: Thu, 04 Dec 2003 19:07:51 -0500
X-Message-Number: 34
Bob wrote about weather data packets from stand-alone WX stations:
>That is another reason why we assumed there would always be a PC.
Huh? When did this become the assumption. I don't remember ever hearing
that. You've known for years that many of us were running stand alone,
non-PC reporting stations (You devised a TOCALL for such units). This is
the first time you *seem* to be saying we shouldn't do that. Is that
because this is the first time it's been pointed out those stations aren't
outputting NWS-correct info. Or am I misconstruing the tone/meaning of your
statement?
>APRSdos properly computes a running wind speed average and also it
>computes the
>running 1 hour rain rate and the 1 day rain rate. THus, what it transmits
>on the air was intended to be the right info.
"Good" for APRSdos. But that didn't make it to the Specs. The Specs don't
indicate the period for calculating wind direction average and they don't
have the "correct" period for wind speed average (assuming the NWS standard
is what should be "correct"). So it would be no surprise if other APRS
programs or devices got it wrong. Not pointing fingers .. it just should be
corrected.
And how DOES APRSdos calculate wind speed? In other words, what type of
data is APRSdos assuming it is getting so that it can compute an average --
a stream of momentary wind speeds? (I would think the WX sending device
would be in a better position to do that calculation.) For rain, I can see
that making more sense -- if the sending unit is simply sending a
cumulative rain count that the program can massage. (I know that this is
what FINDU does.)
And what is APRSdos doing when it calculates 'gusts'? The APRS spec says
"over 5 minutes", but nowhere in the NWS specs does it use 5 minutes -- for
either gusts or wind speed peak.
>Just slapping a WX station to a TNC and throwing all the data out leads to
>this kind of confusion which is why a PC should be involved.
True, but it really would be an improvement to be able to run without a PC
for many reasons -- one less thing to break, less energy spent, less room
required. I'm surprised we never got Peet's ear before to ask them to
output an APRS Spec-compatible packet? (Or maybe someone did and Peet said
it was too hard to compute?)
>Wind speeds in APRS are supposed to be MPH...
If you say so. I agree it makes more sense for most users. But doesn't that
make APRS less useful for the NWS? (I don't know.) If it does, does that
mean we simply have opted not to report data as the NWS would like? If what
you are suggesting is: "APRS weather measurement reporting was never meant
to be match the NWS requirements", then "cool". I'm just trying to dope out
what's going on.
I think it would be interesting to hear from APRS users closely connected
to the NWS. Does the NWS use APRS WX reports? Is it a problem that an
abundance of APRS WX reports are not matching the NWS standards? Since I
run my WX station partly because I think the NWS may look at it its data
from time to time, I'd like to know if that's not true so I can get over
that misconception.
Ralph KC2RLM
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Subject: Re: APRS WX Protocol Questions
From: "Scott Miller" <scott@opentrac.org>
Date: Thu, 4 Dec 2003 16:31:31 -0800
X-Message-Number: 35
A few months ago I started doing some research on NWS and WMO formats for
surface observation reporting, but I'm afraid a lot of it is over my head
and I'm not sure how much of it is applicable for our uses. If you've got a
good handle on how it SHOULD be done, sign up for the OpenTrac mailing list
(http://sourceforge.net/projects/opentrac) and share your thoughts.
I'm particularly interested in making sure you don't have to use up tons of
on-air bandwidth to report a few simple parameters, but you also should have
the option of including more esoteric readings if you want. There are also
issues of units and averaging times to consider, and perhaps some kind of
metadata on system accuracy - what good are 10,000 weather stations if you
don't know which ones meet your data quality standards?
The OpenTrac specification has some draft material on weather formats, but
it's really just my first crack at it. I'd be thrilled if someone wanted to
take on this aspect of the spec.
Scott
N1VG
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