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ZL3AI > APRDIG 13.12.06 03:32l 76 Lines 2756 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 30 #4, 2/2
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Message: 9
Date: Tue, 05 Dec 2006 14:10:13 +1030
From: Ben Lindner <vk5jfk_at_activ8.net.au>
Subject: Re: [aprssig] backup pwr systems
We are talking radio only
Joe Della Barba wrote:
>Are you talking about a radio (original post) or an entire house?
>For a house a genset is the only way to go IMHO. Plenty of them out
>there in gas, diesel, and propane.
>73
>Joe N3HGB
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Message: 10
Date: Tue, 5 Dec 2006 07:31:37 -0800
From: "VE7GDH" <ve7gdh_at_rac.ca>
Subject: Re: [aprssig] backup pwr systems
Ben VK5JFK wrote...
>Do you have a copy of the circuitry used by West Mountain Radio
I dug up the info sheet on the PWRgate and it didn't include the drawing.
The older model they sold just consisted of a couple of Schottky diodes plus
I believe a another diode & resistor for charging the battery. Their newer
model has a more sophisticated charging circuit that allows you to select
the maximum charging rate as well as being a 4 stage charger.
73 es cul - Keith VE7GDH
--
"I may be lost, but I know exactly where I am!"
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Message: 11
Date: Tue, 5 Dec 2006 11:51:47 -0500
From: "Rochte, Robert" <rrochte_at_gpacademy.org>
Subject: RE: [aprssig] smallest tracker?
I've read a number of the studies that have used dataloggers - I borrowed
my maximum weight figure from them! I would very much prefer, however, to
do live tracking. Not only because it will be a "first" (at least as far
as I can tell), but also because it will be much more engaging for students
to watch the bird's progress throughout the day.
With a live system, we could even do cooperate work with schools around the
country and the world, testing various student hypotheses and allowing the
other schools to pull the data right from Findu or APRSworld.
(It's hard to impress students with ham radio these days, since they all
have cell phones in the their pockets from about grade 4 and up here...
This would certainly do the trick and maybe get us some media exposure, too
- if the reporters will bother to actually mention the ham connection!)
>Seems like the GPS antenna weight might be a problem - patches are kind of
>heavy. You might check out the Sarantel Geohelix P2. Without the sleeve,
>it's 7 grams. I've got a tiny SiRF receiver to go with it, but I haven't
>put the whole thing together yet. A datalogger would certainly be easier
>than an APRS transmitter, if you don't need live updates. Pigeons have
>proven their ability to carry multiple gigabytes of data...
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End of aprssig Digest, Vol 30, Issue 4
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