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ZL3AI > APRDIG 12.01.07 09:42l 265 Lines 9124 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 31 #12, 1/2
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Today's Topics:
1. Re: Quad antenna construction techniques (Stephen H. Smith)
2. APRS / ADSB site update (Andrew Rich)
3. more ocean buoy stuff (Jim Lux)
4. RE: more ocean buoy stuff (Robert Bruninga)
5. RE: more ocean buoy stuff (Ray McKnight)
6. Re: I Apologize! (Phillip B. Pacier)
7. RE: Quad antenna construction techniques (AC7YY)
8. Re: Quad antenna construction techniques (Stephen H. Smith)
9. RE: Eagle Scout Icon - Was Re: [aprssig] APRS data for Scout Events
(Dave Baxter)
10. RE: more ocean buoy stuff (Robert Bruninga)
11. Re: I Apologize! (Steve Dimse)
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Message: 1
Date: Tue, 09 Jan 2007 10:50:34 -0800
From: "Stephen H. Smith" <wa8lmf2_at_aol.com>
Subject: Re: [aprssig] Quad antenna construction techniques
Here's a spreaderless design that uses only 3/4" PVC water pipe, 4-way
cross fittings and #14 solid house wire. This is mounted in my attic crawl
space, and is pointed at a local repeater used for APRN (Automatic Picture
Reporting System - combined SSTV & APRS).
--
Stephen H. Smith wa8lmf (at) aol.com
EchoLink Node: 14400 [Think bottom of the 2M band]
Home Page: http://wa8lmf.com --OR-- http://wa8lmf.net
NEW! TNC Test CD
http://wa8lmf.net/TNCtest
JavAPRS Filter Port 14580 Guide
http://wa8lmf.net/aprs/JAVaprsFilters.htm
"APRS 101" Explanation of APRS Path Selection & Digipeating
http://wa8lmf.net/DigiPaths
Updated "Rev G" APRS http://wa8lmf.net/aprs
Symbols Set for UI-View,
UIpoint and APRSplus:
------------------------------
Message: 2
Date: Wed, 10 Jan 2007 06:29:49 +1000
From: "Andrew Rich" <vk4tec_at_tech-software.net>
Subject: [aprssig] APRS / ADSB site update
I have re-worked my web site.
www.tech-software.net
Cheers Andy
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec_at_tech-software.net
web: http://www.tech-software.net
Brisbane AUSTRALIA
------------------------------
Message: 3
Date: Tue, 09 Jan 2007 14:59:10 -0800
From: Jim Lux <jimlux_at_earthlink.net>
Subject: [aprssig] more ocean buoy stuff
Just following up on the many responses. Here's a quick summary:
1) VHF antenna sitting on the ocean surface is going to have "radio
horizon" issues (which I sort of expected). While there ARE mountaintop
digis around, they may have directional antennas, and based on my
experience in the Los Angeles area, you're going to need a 50W Tx to get in
halfway reliably.
2) 30m will require very good frequency control, and of course you're
subject to the vagaries of propagation. probably need to run a bit of
power too (but you'd have to do the same for VHF). (there may also be a
legal issue with control operators and the like.. one thing to have a 30m
APRS tracker in your car, where you can turn it off. Totally another to
have it drifting randomly off the coast of California.. but that applies to
ANY transmitter)
3) While the APRS format normally only includes lat/lon sorts of things,
there would be no problem adding some more data. After all, it's just
packet radio, and you can conceivably put pretty much anything you want
into the packet.
The commercial solutions are a bit more pricey (figure $1000 for the Tx,
and probably $500-1000 for a year's worth of monitoring) but are intended
for this kind of application, have very low power transmitters (e.g. 401
MHz for Argos, with built in batteries, designed to be glued to the back of
a whale or something similar), etc.
Jim, W6RMK
------------------------------
Message: 4
Date: Tue, 9 Jan 2007 18:13:16 -0500
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: RE: [aprssig] more ocean buoy stuff
>3) While the APRS format normally only includes lat/lon sorts of
>things, there would be no problem adding some more data.
Our Naval Academy Buoy Designs use the standard APRS 5 channel telemetry
format of the MIM, Mic-E and KPC-3+ designs. We use these 5 channels as
follows:
Ch1 Battery volts
Ch2 Water Temp
Ch3 Water Temp
Ch4 Luminosity
Ch4 Water conductivity (Salinity)
In addition, you get automatically from the GPS posit, the LAT/LONG,
direction and speed.
And the decoding and display of all that data is automatic in FINDU.COM no
matter where your buoy is. See our Buoy Page:
http://www.ew.usna.edu/~bruninga/buoy.html
See how easy it is to display your data LIVE From FINDU.COM:
http://www.ew.usna.edu/~bruninga/andeTLM1.html
That data happens to be ANDE satellite data, but its because our buoy is
temproarily out of the water and so after 10 days, FINDU.COM is no longer
showing the Buoy data.
------------------------------
Message: 5
Date: Tue, 9 Jan 2007 15:46:49 -0800
From: "Ray McKnight" <shortsheep_at_worldnet.att.net>
Subject: RE: [aprssig] more ocean buoy stuff
Bob, do your Academy buoys have drogues attached? If not, the buoys drift
will be primarily influenced by wind, Not current. The WOCE buoys we
deployed had a 50m sock to Catch the core of the Gulf Stream, Labrador or N
Atlantic current.
Also, I'm curious what speeds you normally see from your buoys. And if you
derive direction from the position reports or is It reported from GPS, as
most GPS can't calculate heading under 2kts of speed. The Magellan 3-D
GPS's we fitted on our icebreakers could, but required a 4-antenna array in
a T configuration, separated by about 2 ft ea. Those GPS's set us back
about $20K ea.
------------------------------
Message: 6
Date: Tue, 09 Jan 2007 17:25:16 -0800
From: "Phillip B. Pacier" <ad6nh_at_arrl.net>
Subject: Re: [aprssig] I Apologize!
KCøRNP Richard wrote:
>I just got to thinking - If CWOP folks are a problem then why has
>someone not make a CWFindU like Steve did with FindU? It's just a
>thought that might end the "WAR" that is going on right now :)
Well, that was the plan four or however many years ago when Dick and I
opened up the first two connection points, and then later added the
other two. After working with Pete's database program, I offered the
CWOP guys the opportunity to grab their data from the closest source
point possible - the input server itself. For many reasons, it was not
accepted, and that is fine. But, that is the explanation.
73
Phil - AD6NH
www.aprs2.net
>I understand CWOP most "likely" is not a Ham Radio operator, however
>we as hams SHOULD do our part and help them out, after all that cell
>phone you carry around was based off of Ham Radio autopatch (Think
>about it and I am sure you would agree with that statement).
------------------------------
Message: 7
Date: Tue, 9 Jan 2007 21:19:39 -0800
From: "AC7YY" <ac7yy_at_aikenco.net>
Subject: RE: [aprssig] Quad antenna construction techniques
Do you have foil backed insulation in your attic walls and joists? and if
so, does that not effect the antenna?
Kim - AC7YY
>-----Original Message-----
>
>Here's a spreaderless design that uses only 3/4" PVC water pipe, 4-way
>cross fittings and #14 solid house wire. This is mounted in my attic
>crawl space, and is pointed at a local repeater used for APRN
>(Automatic Picture Reporting System - combined SSTV & APRS).
>
>< http://wa8lmf.net/2mStealthQuad.jpg >
------------------------------
Message: 8
Date: Tue, 09 Jan 2007 21:28:28 -0800
From: "Stephen H. Smith" <wa8lmf2_at_aol.com>
Subject: Re: [aprssig] Quad antenna construction techniques
ac7yy_at_aikenco.net wrote:
>Do you have foil backed insulation in your attic walls and joists? and if
>so, does that not effect the antenna?
>
>Kim - AC7YY
This is a 70-year-old cottage with absolutely no insulation anywhere in
either it's walls or attic. As you can see in the photo, the rafters are
completely bare. The only potential pattern distortion may come from the
antique single-conductor knob-and-tube electric wiring strung through the
ceiling joists. Conveniently the antenna fires out the end of the
pitched roof, so that even when the roof is soaked with the rare (for
southern California) rain, signal levels don't vary much. Actually, quad
antennas are low-Q devices much less affected (and detuned) by nearby junk
than yagis.
--
Stephen H. Smith wa8lmf (at) aol.com
EchoLink Node: 14400 [Think bottom of the 2M band]
Home Page: http://wa8lmf.com --OR-- http://wa8lmf.net
------------------------------
Message: 9
Date: Wed, 10 Jan 2007 08:56:52 -0000
From: "Dave Baxter" <dave_at_emv.co.uk>
Subject: RE: Eagle Scout Icon - Was Re: [aprssig] APRS data for Scout Events
I think that's highly appropriate, considering some of the Scout events
I've assisted with in the past, "Danger" most certainly, to one's sanity
that is!... Here, I suspect half of them cant make a fire, even with
matches & tinder! Mind you, with many kids these days that's a blessing in
disguise...
Dave G0WBX.
>-----Original Message-----
>
>Though the atom one might be useful, too. The trefoil
>implies danger, which might not be what you want. For that
>matter, an oscilloscope trace or something might be useful
>for electrical stuff or general telemetry.
>
>Scott
>N1VG
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