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ZL3AI > APRDIG 15.03.04 13:14l 148 Lines 5209 Bytes #999 (0) @ WW
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To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Saturday, March 13, 2004.
1. radar imagery
2. Re: High speed data
3. Re: OEM GPS modules
4. Re: High speed data
----------------------------------------------------------------------
Subject: radar imagery
From: Gerry Creager N5JXS <gerry.creager@tamu.edu>
Date: Sat, 13 Mar 2004 16:54:06 -0600
X-Message-Number: 1
The mosaics aren't up yet, but I'm working on them. However, there are
some examples.
http://mesonet.tamu.edu/APRS has .geo and .inf files for a US mosaic and
a Texas regional mosaic. These files are updated every 6 minutes, the
same time as the volume sweep is updated on the WSR-88D radars, so
they're about as fresh as they get.
The US mosaic is large: 6000x3500 pixels. That's to keep the resolution
of the radar volume bins at 0.01 degree/pixel. *THAT'S* why I've
started working on regional mosaics, which will also have the same
resolution.
Lest someone ask, I'm not going to process the imagery to make it
"nicer" to view. If we smooth things out, the data gets lost. I think
it's more important to have the real data there than make a pretty
picture. The farther you zoom out, the smoother things look...
*UI-View Users:* I don't have UI-view... it doesn't run on Linux. Thus
I cannot check the accuracy of the .INF files I'm providing. I'd
appreciate helpful feedback so we can tune these and I can make others
as I do other mosaics.
The files can be found at http://mesonet.tamu.edu/APRS/
73, Gerry N5JXS
--
Gerry Creager -- gerry.creager@tamu.edu
Network Engineering -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843
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Subject: Re: High speed data
From: Brian D Heaton <bdheaton@c4i2.com>
Date: Sat, 13 Mar 2004 22:38:46 -0500
X-Message-Number: 2
How about a Metricomm Ricochet GS 900Mhz modem with a 1 watt amp and a
PDA or small embedded PC board? I've been buying the modems themselves
for less than $10 each....
73/N5VFF
On Fri, 2004-03-12 at 16:17, Larry wrote:
>My first cellphone was a Motorola DynaTAC 8000 portable, which cost me
>$4,200 in 1983 (which would be around $5,400 in 2004 dollarts). First
>adopters pay through the nose, to be sure.
>
>My understanding is that the AMBE 2020 Icom radios on the 2M/440 bands will
>be comparably priced with their current analog FM gear. It's the high speed
>128 kb/s stuff at 1.2 GHz that is so pricey. If you can live with AMBE and
>simultaneous 2400 bps data, they are suppoosed to be priced about the same
>as today's present analog FM radios.
>
>I guess the proof will be in the puding!
>
>Larry
----------------------------------------------------------------------
Subject: Re: OEM GPS modules
From: Brian D Heaton <bdheaton@c4i2.com>
Date: Sat, 13 Mar 2004 22:47:01 -0500
X-Message-Number: 3
Scott,
(sorry I'm coming in a bit late here....)
I've used some of the older SD-125s for a project at work. The things
are built like a brick and work great. I haven't tried to pull them
down to 144Mhz, but if you email Topaz they'll probably tell you. Let
me know if you need me to dig up the direct email for their US marketing
director....
They also have a low-power mode that can help cut down battery usage.
We were seeing 12+ hour runs with NiMH AA batteries, a TT2, GPS16, and
SD-125 on 5-minute transmit intervals. That was without the battery
saving features of the TT3 (putting the radio and GPS to sleep between
updates)
73/N5VFF
On Thu, 2004-03-04 at 18:21, Scott Miller wrote:
>>By the time you buy the optional 144.39 RX and TX crystals (it comes
>>crystalled for traditional packet on 145.010), you could have bought a
>>normal two-meter monobander such as a Yaesu FT-1500 with far more power
>>and receiver performance (and the MiniDIN6 packet connector on the
>>rear). FT-1500s are periodically blown out on specials for $119 or $129
>> or so by the usual mail-order ham dealers.
>
>True. How about one of these?
>
>http://www.rfwiz.com/Maxon/DataRadios/SD-161V_SD-164U_DataRadio.htm
>
>http://www.topaz3.com/product.asp?StrProd=SD160
>
>Scott
>N1VG
----------------------------------------------------------------------
Subject: Re: High speed data
From: Earl Needham <needhame1@yucca.net>
Date: Sat, 13 Mar 2004 21:28:24 -0700
X-Message-Number: 4
At 01:40 PM 3/12/2004, Larry Zanella wrote:
>Earl, if you want true high speed data, such as 128 kb/s, you might want to
>consider the ICOM D-Star ID-1 radio. Also, you can transmit slow speed data
>(2.4 kb/s) simultaneously with AMBE 2020 digital voice on their newsest
>digital voice radios that operate on 2M/440. You can see these new digital
>voice (AMBE 2020) on their ICOM Japan site, but they are rumored to be
>introduced at this years Dayton (the ID-1 D-Star will be here sooner).
Would be great, except I'd be all alone up there. Now, if we could ALL
move there it might be something worth considering.
7 3
Earl
Earl Needham, KD5XB, Clovis, New Mexico DM84jk
SETI@Home: 11399WU/7.4yrs
---
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