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ZL3AI > APRDIG 15.12.06 09:19l 143 Lines 4874 Bytes #999 (0) @ WW
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Message: 10
Date: Sun, 10 Dec 2006 22:36:19 -0800
From: Derek Koonce <derek_at_dkoonce.com>
Subject: Re: [aprssig] backup pwr systems - slightly off-topic
Bruce,
I have looked at these systems. Most on-grid systems will shut down if
they detect the power grid shutting down. They will not power the house
in this state unless one has a battery back-up system. And then the
system will disconnect the house from the grid to prevent "islanding".
Derek Koonce
KE6JTP
Bruce Gordon wrote:
>Bob,
>
>What you describe is exactly a grid-tie inverter, just not so large as those
>used in all house or larger systems. I have never seen how they protect
>themselves and others from the hazards of tying to the grid but I can't
>think of a reason that it couldn't be done in a smaller unit. Might burn up
>a little of that "copious free time" however.
>
>Bruce Gordon
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Message: 11
Date: Mon, 11 Dec 2006 03:02:10 -0800 (PST)
From: M J <mjandthegang_at_yahoo.com>
Subject: Re: [aprssig] Receive Only APRS
I'm going to check these two out more closely as they seem to fit the
stand-alone hardware solution I'm looking for. Thanks, to everyone who
chimed in to help me! MJ
----- Original Message ----
>From: Jason Winningham <jdw_at_eng.uah.edu>
>
>>Any opinions about choices available?
>
>Once choice is to get the TNC of your choice and only hook up your
>scanner's speaker output.
>
>Here is one example of a decode-only circuit:
>
>http://www.ringolake.com/pic_proj/decoder/rx_206.html
>
>I have one of these in front of me right now decoding packets from an
>old uniden police scanner found in my parents' basement. The down
>side to it is that, unless you've got components and a programmer on
>hand, it's far simpler and not much more expensive to go and get
>yourself a TNC-X kit http://www.tnc-x.com/ or wait a bit until more
>kits are available and get a Tracker2 (now in beta; I have one and
>it's great for APRS). If you're not familiar with packet and
>hardware tinkering, you should probably wait a while on the T2.
------------------------------
Message: 12
Date: Mon, 11 Dec 2006 08:50:13 -0500
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: RE: [aprssig] backup pwr systems
List'" <aprssig_at_lists.tapr.org>
>What you describe is exactly a grid-tie inverter, just not so
>large as those used in all house or larger systems. I have
>never seen how they protect themselves and others from the
>hazards of tying to the grid...
My thought is just a sensing circuit that only fires the inverter MOSFET's
on the rising side of the 60 cycle waveform. And then fires them for 50ms
or so on each cycle. If there is no waveform, then the inverter
transistors don't fire. Should be very simple.
And would let me keep all my APRS stuff running 24/7 and take advantage of
the sun at midday.... Without having to re-wire anything.. ;-)
Bob, WB4APR
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Message: 13
Date: Mon, 11 Dec 2006 09:50:59 -0600
From: "flknbry" <flknbry_at_netzero.net>
Subject: [aprssig] mobil aprs software
Hi
If one were to obtain an old laptop,interface a gps,which software would be
best?..run dosaprs?..Would like to recieve and be able to send messages..
Quentin
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Message: 14
Date: Mon, 11 Dec 2006 08:12:52 -0800 (PST)
From: "Curt, WE7U" <archer_at_eskimo.com>
Subject: Re: [aprssig] mobil aprs software
On Mon, 11 Dec 2006, flknbry wrote:
>If one were to obtain an old laptop,interface a gps,which software would
>be best?..run dosaprs?..Would like to recieve and be able to send
>messages..
Depends on how old and what capability it has.
If it can only run DOS, then yes, APRSdos would be the one. If you don't
care about mapping and really just need tracking/messaging, you might
consider a HamHUD to get rid of the laptop altogether.
If the laptop is a little more capable you might install Win98se on it (a
reasonably stable operating system) and run UI-View, WinAPRS, APRS-SCS, or
APRS+SA.
Another alternative on the old/slow laptops is Linux/Xastir, as Linux can
run quite well on old hardware. I've run Xastir nicely on a P133/64M and a
P200/32MB laptop. One of our users tests it once a year or so on his 486
laptop to make sure it still compiles/runs there, although I wouldn't
recommend going that slow. It'll work, it's just painfully slow drawing
some types of maps.
--
Curt, WE7U. APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
------------------------------
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