| |
ZL3AI > APRDIG 11.12.03 07:21l 252 Lines 9558 Bytes #999 (0) @ WW
BID : 2454-ZL3AI
Read: GUEST
Subj: TAPR Digest, Dec 05, 1/2
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<ZL2BAU<ZL2BAU<ZL3VML
Sent: 031211/0427Z @:ZL3VML.#80.NZL.OC #:14322 [Chch-NZ] FBB7.00i $:2454-ZL3AI
From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Friday, December 05, 2003.
1. HF APRS - new lease on radio
2. Re: I-Gate Without a Computer
3. Army-Navy Game
4. Re: HF APRS - new lease on radio
5. RE: D700 Problem
6. Re: APRS WX Protocol Questions
7. Re: Army-Navy Game
8. Re: APRS WX Protocol Questions
9. RE: APRS HF Antenna dimensions
10. Re: La Crosse Technology WX Stations
11. Silicon Valley discovers Digipeaters; Calls them "Mesh Computing"!
12. Re: Silicon Valley discovers Digipeaters; Calls them "Mesh Computing"!
13. Football Underway
14. ? GM-300 Acc Plug to KPC3+ Connections ?
15. RE: Football Underway
16. Digi Coverage I-95 FL to NYC ??
17. Re: ? GM-300 Acc Plug to KPC3+ Connections ?
----------------------------------------------------------------------
Subject: HF APRS - new lease on radio
From: "Andrew Rich" <vk4tec@hotmail.com>
Date: Sat, 6 Dec 2003 20:55:30 +1000
X-Message-Number: 1
I just equipped myself with a HF radio and setup the soundcard for 300 Baud
packet with ui-view.
I am amazed. I am picking up stations thousands of kms away.
I have never been on HF before. Always been a VHF/UHF bunny.
I reckon this is the bees nees.
Now I am getting keen to experiment with HF antennas.
Having Fun
Andrew VK4TEC
----------------------------------------------------------------------
Subject: Re: I-Gate Without a Computer
From: "Tim Cailloux" <tim@cailloux.com>
Date: Fri, 05 Dec 2003 08:06:17 -0500
X-Message-Number: 2
>Is there any other way to setup an I-Gate without having a computer?
I have designed devices that do similar things for non-APRS projects, and
it's actually not that hard if you find the right thing to use. The
product that I use for such devices is from Rabbit Semiconductor
(http://www.rabbitsemiconductor.com/). They have a pretty good software
development environment for their PIC and it lets you write stuff fairly
quickly, as well as having an RS-232 output on the chip. You can get a
pretty inexpensive one ($120-ish) that should be able to handle most of
the functionality.
tim
--
Tim Cailloux
tim@cailloux.com
404-875-0778
----------------------------------------------------------------------
Subject: Army-Navy Game
From: "Clayon H. Owen" <aa3jy@winlink.org>
Date: Fri, 5 Dec 2003 8:8:55
X-Message-Number: 3
Where's the 'Football' Bob?
----------------------------------------------------------------------
Subject: Re: HF APRS - new lease on radio
From: "Clayon H. Owen" <aa3jy@winlink.org>
Date: Fri, 5 Dec 2003 8:11:48
X-Message-Number: 4
Good to see you on HF de Clay AA3JY (Hardcore HF APRS
----------------------------------------------------------------------
Subject: RE: D700 Problem
From: Bob Bruninga <bruninga@usna.edu>
Date: Fri, 5 Dec 2003 09:19:38 -0500 (EST)
X-Message-Number: 5
On Thu, 4 Dec 2003, WalterH wrote:
>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.
The only way I know to do it is to simply save 5 different config files.
Then when you reload, you reaload one at a time and tos PM SAVE...
Bob
----------------------------------------------------------------------
Subject: Re: APRS WX Protocol Questions
From: Bob Bruninga <bruninga@usna.edu>
Date: Fri, 5 Dec 2003 09:35:28 -0500 (EST)
X-Message-Number: 6
On Thu, 4 Dec 2003, Ralph Milnes wrote:
>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.
No, the "assumption" that I referred to was the assumption back in 1994
and 1995 before there were any stand-alone TNC/WX combos.. Then when Peet
first came out with their packet format, that is why we added the
(P)Rpecipitation-since-midnight format. Because it couldnt report in rain
per hour or per 24 hour sliding window.
Once we began seeing stand-alone WX stations, I made the changes in
APRSdos to try to let it compute the running statistics even based on what
it was receiving off the air... but this became unwiledy because I would
have had ot store every WX report from every WX station going back an
hour. I didnt have the room, and besides, by then, everyone was switching
to WinAPRS because it had some nice WX displays.
>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?
It has always been an issue. My assumption is that those people that
want to use APRS for "real" WX, have to make the effort to 1) properly
format the data to NWS standardds prior to transmission, OR convert it on
receipt and then process it prior to using it for meaningful comparisons.
It is a COMPLEX issue.
That is another reason why the only valid ON-AIR format is best kept to
be the APRS format, because it ASSUMES that the data has been
pre-processed into the NWS standards...
>>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.
Yes, this just an example of some of the details that never got into the
spec, because of the "committee proceess" that wrote the spec...
>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 --
>astream of momentary wind speeds?
Yes, Its been 8 years since I wrote that module, but I think the PEET
ouputs data every 10 seconds or so? For the 2 minute period, then that is
12 samples that are easy to average. Same with the Rain readings. so that
I get precipitation per hour... But! If my memory serves me, APRSdos
might actually be using a 1 minute sustained wind. Whatever the experts
at the time told me..
>(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.
That one did evolve from the once-every-5-minute packet from PEET. Since
that is what they outputl, then that is what we accepted...
>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?
THAT ANSWER IS EASY! At the time, we asked on the APRSSIG for WHAT was
the standard for wind? The answers came back from all over the country
and said MPH. ANd these were from all the "APRS WX" experts. If the NWS
has changed to KNOTS then they didnt tell us back before 1996...
>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
----------------------------------------------------------------------
Subject: Re: Army-Navy Game
From: Bob Bruninga <bruninga@usna.edu>
Date: Fri, 5 Dec 2003 10:04:44 -0500 (EST)
X-Message-Number: 7
Leaves at noon, but the mids cant even find the vehicles we are supposed
to outfit yet...
bob
----------------------------------------------------------------------
Subject: Re: APRS WX Protocol Questions
From: Bob Bruninga <bruninga@usna.edu>
Date: Fri, 5 Dec 2003 10:26:38 -0500 (EST)
X-Message-Number: 8
On Fri, 5 Dec 2003, Bob Bruninga wrote:
>That is another reason why the only valid ON-AIR format is best kept to
>be the APRS format, because it ASSUMES that the data has been
>pre-processed into the NWS standards...
Let me re-phrase that now that I see it in print. Here is what I meant:
If it is in APRS format, then it should be already converted. If it is in
another format, then by that very nature, then we know its format and
we can convert it on receipt...
What we dont want is a single format that is DIFFERENTLY pre-converted...
Bob
----------------------------------------------------------------------
Read previous mail | Read next mail
| |
