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ZL3AI > APRDIG 15.12.06 09:22l 235 Lines 8478 Bytes #999 (0) @ WW
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To : APRDIG@WW
Today's Topics:
1. Re: mobil aprs software (Mike Miller)
2. RE: mobil aprs software (Brian Webster)
3. Re: mobil aprs software (Stephen H. Smith)
4. RE: backup pwr systems (Alex Carver)
5. RE: backup pwr systems (VE7GDH)
6. RE: backup pwr systems (Bob Bruninga )
7. RE: backup pwr systems (Bob Bruninga )
----------------------------------------------------------------------
Message: 1
Date: Mon, 11 Dec 2006 12:38:10 -0600
From: "Mike Miller" <mike.kc9doa_at_sbcglobal.net>
Subject: Re: [aprssig] mobil aprs software
I run UI-View32 under Win98SE on a Pentium75 laptop. I use a KISS TNC and
fixed maps and it works fine. I had to add a second serial port via a
pcmcia card for the Garmin GPS18PC GPS. I'm testing a P166 machine now and
it will run AGWPE as a soundcard TNC.
Mike kc9doa
>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
------------------------------
Message: 2
Date: Mon, 11 Dec 2006 13:48:53 -0500
From: "Brian Webster" <bwebster_at_wirelessmapping.com>
Subject: RE: [aprssig] mobil aprs software
If the laptop is so old that it runs Windows 3.11 you could also use
ui-view 16 and some static maps.
Thank You,
Brian N2KGC
------------------------------
Message: 3
Date: Mon, 11 Dec 2006 11:57:02 -0800
From: "Stephen H. Smith" <wa8lmf2_at_aol.com>
Subject: Re: [aprssig] mobil aprs software
archer_at_eskimo.com wrote:
>
>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.
Note that the current version of Undertow Precision Mapping (Ver 8.0) (used
with UI-View for scrollable, zoomable maps of the U.S. and Canada) WILL
NOT install or run on Win98SE. The minimum OS requirement for PMap 8 is now
Win 2000 or XP.
If you want to use Precision Mapping with a Win98 installation, you will
have to locate a second-hand copy of the now out-of-print Precision Mapping
7.0 or earlier.
--
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: 4
Date: Mon, 11 Dec 2006 15:34:28 -0800 (PST)
From: Alex Carver <agcme2002_at_yahoo.com>
Subject: RE: [aprssig] backup pwr systems
>Message: 12
>Date: Mon, 11 Dec 2006 08:50:13 -0500
>From: "Robert Bruninga" <bruninga_at_usna.edu>
>Subject: RE: [aprssig] backup pwr systems
>
>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.. ;-)
You would have the power company beating down your door that way.
Switching the MOSFETs on only a half cycle would introduce even more
harmonics into the output power and get fed back into the grid. Best to
just stick with a standard UPS for each item (or group of items) you want
to keep powered or go with a grid-tie inverter system. Having something
that plugs into the wall as you describe is a sure-fire way to electrocute
a line worker when the power goes out (because you don't have an
anti-islanding relay installed as would normally come with a grid-tie
inverter).
------------------------------
Message: 5
Date: Mon, 11 Dec 2006 16:49:11 -0800
From: "VE7GDH" <ve7gdh_at_rac.ca>
Subject: RE: [aprssig] backup pwr systems
Alex (callsign?) wrote...
>Best to just stick with a standard UPS for each item
>(or group of items) you want to keep powered or go
>with a grid-tie inverter system. Having something that
>plugs into the wall as you describe is a sure-fire way to
>electrocute a line worker when the power goes out
>(because you don't have an anti-islanding relay
>installed as would normally come with a grid-tie inverter).
Definitely not good thing to feed 120 VAC out into the line so some
unsuspecting line worker gets zapped with 15,000 volts or whatever the
other side of that transformer he was working on.
Some areas near where I live are experiencing winds in the 80 - 100 knot
range (that's hurricane strength) right now. This is the second big wind
storm we have had in about three weeks, with a shot of winter in between
(45 cm of snow and cool temperatures) and I've had a few bumps in the
power. Many places are already without power. I suspect that my backup
power system will be earning its keep again later on today. I can keep APRS
and IRLP 1148) going for about a week, but the ADSL connection would
probably go down in a day or two in a sustained outage. Ooops... my
prediction was correct. Power just went off. Running on emergency power
here!
73 es cul - Keith VE7GDH
--
"I may be lost, but I know exactly where I am!"
------------------------------
Message: 6
Date: Mon, 11 Dec 2006 23:20:11 -0500 (EST)
From: "Bob Bruninga " <bruninga_at_usna.edu>
Subject: RE: [aprssig] backup pwr systems
>Best to just stick with a standard UPS for each item
>(or group of items) you want to keep powered or go
>with a grid-tie inverter system. Having something that
>plugs into the wall as you describe is a sure-fire way to
>electrocute a line worker when the power goes out
>(because you don't have an anti-islanding relay
>installed as would normally come with a grid-tie inverter).
You didnt read my original post. I proposed a synchronous inverter that
can only generate power when there is already 60 Hz power there. None when
there is not. I agree, safety is paramount. Bob
------------------------------
Message: 7
Date: Mon, 11 Dec 2006 23:33:21 -0500 (EST)
From: "Bob Bruninga " <bruninga_at_usna.edu>
Subject: RE: [aprssig] backup pwr systems
>>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.
>
>You would have the power company beating down your
>door that way. Switching the MOSFETs on only a
>half cycle would introduce even more harmonics
>into the output power and get fed back into the grid.
No, that's what every light dimmer does, And if it is running a 400 watt
lamp load like a dining room light then it is the same harmonics. A simple
RFI filter can smooth it up so even a HAM can run on the same power.
THink about it. The load of the "grid" is something like maybe 0.01 ohm or
much less. There is little that a single mosfet (or a single light dimmer)
can do that would cause any discernable gliches on the waveform. All the
mosfet would do would be to contribute a flea power of current, and it
would never leave my house, since with only 400W going in, and my houose
drawing 1 kW, then nothing leaves my system. I just reduce my current is
all.
>Best to just stick with a standard UPS for each
>item (or group of items)... or go with a
>grid-tie inverter system.
Yes, that was the orginal thread. I'm looking for a synchronous inverter
(call it a grid tie system) in the 400 watt class that should be able to be
built for under $100 in electronics. The cheapest grid-tie systems are in
the thousands of dollars. Hence by post.
>Having something that plugs into the wall as you
>describe is a sure-fire way to electrocute a line
>worker when the power goes out (because you don't
>have an anti-islanding relay installed as would
>normally come with a grid-tie inverter).
No, you didnt read my post correctly. I said a synchronous inverter which
means it cannot generate power on its own with out the presence of the 60
Hz grid in the first place. It is inherently safe by design.
Bob
------------------------------
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