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ZL3AI > APRDIG 18.03.07 03:04l 246 Lines 9268 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 33 #9, 1/2
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Today's Topics:
1. D7's,D700's and TinyTrak (Alex Carver)
2. APRS telemetry to the planets (Robert Bruninga)
3. RE: APRS telemetry to the planets (Robert Bruninga)
4. RE: APRS telemetry to the planets (Robert Bruninga)
5. Re: Re: GPS/PC/D7A (Jason D. Triolo)
6. Re: Re: GPS/PC/D7A (Jan T. Pharo)
7. RE: APRS telemetry to the planets (Ken Patterson)
8. Re: APRS telemetry to the planets (Stan Leeds, KC7EHJ)
9. Windows Mobile 5, Pocket PC Software (Eric Goforth)
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Message: 1
Date: Wed, 7 Mar 2007 15:24:54 -0800 (PST)
From: Alex Carver <agcme2002_at_yahoo.com>
Subject: [aprssig] D7's,D700's and TinyTrak
You don't even need to interface to the buttons on the display. Remember
that the D7 and D700 respond to serial port commands even while in APRS
mode. You just have to issue BCON 0\n BCON 1\n over the serial port and
the radio will beacon. You can also change the beacon rate via the serial
port too which gives you the smart beaconing rate.
I had planned on doing this with a microcontroller piggy-backed on the
serial port and listening to the GPS feed directly. A Y-cable would split
the GPS data between this microcontroller and the radio. I also thought
about having a pass-through serial port so the microcontroller could be
left on the radio and still allow a computer to be connected. But that's a
little more work than just tracking and adjusting the radio's parameters.
>From: Steve Noskowicz <noskosteve_at_yahoo.com>
>
>Rod,
>Where there's a will...
>Another idea FWIW. Would probably require an additional 555 timer, but...
>The top row of buttons on the D700 Mic are hardware inputs to the radio.
>I use the one set to BCON to force a skwawk when I want. The radio
>skwawks when BCON is first turned on. The TT could be interfaced there also.
>The correct resistor value is needed.
>Set one of these mic buttons to the BCON function (
>I don't recall if that is one of the defaults
>or a custom setting), then have the TT turn on BCON
>when it needs to skwawk -- then shortly after, turn it off (the 555's job).
>73, Steve, K9DCI
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Message: 2
Date: Wed, 7 Mar 2007 18:31:35 -0500
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: [aprssig] APRS telemetry to the planets
APRS Telemetry to the planets
To demonstrate solar power and the distances to the planets, our students
used a mock planetary explorer consisting of a solar panel on a satellite
model on a cart:
http://www.ew.usna.edu/~bruninga/EPSplanets.html
They backed the cart away over 590 feet from a 1000W spot lamp to get from
Mercury to Jupiter. A KPC-3+ TNC provided APRS telemetry to a laptop which
plotted the IV curve of the solar panel along the way (which was down 1000
to 1 by the time they got to Saturn (the size of a BB)... Pluto was in the
next building.
Anyway, students had fun. And we got some nice photos. I compressed them
in PAINT and they are under 40k and load pretty fast.
Just an example of how we use Ham radio in the classroom.
Bob, WB4APR
------------------------------
Message: 3
Date: Wed, 7 Mar 2007 21:36:47 -0500
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: RE: [aprssig] APRS telemetry to the planets
>1. What grade level is your interplanetary experiment taught?
Sophmores. It is just one exercise in 6 that they do in the Elecrical
Power Lab for their satellite class for Aerospace majors. They do all 6 in
2 hours.
>Do many of your students hold ham tickets, or go on to obtain
>them while at USNA (if they might have time)? I knew of no
>active duty USN officers having a ticket when I was an active
>officer - only enlisted folks that forced me to go for my ticket.
None. The few midshipmen that get their license I have never had in a
class myself, though they do come hang around here in the lab.
>2. Would it have been cause for possible confusion between a
>meter/foot correlation versus translating every measurement
>into metric equivalents throughout?
The tiles on the floor are 1'. Makes navigation easy.
But thanks for your interest!
Bob
WB4APR
------------------------------
Message: 4
Date: Wed, 7 Mar 2007 21:42:07 -0500
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: RE: [aprssig] APRS telemetry to the planets
>Subject: Re: [aprssig] APRS telemetry to the planets
>
>Bob, this has to be one of the slickest ideas I've seen in a
>long time! I'm batting around the idea of scaling it down to
>my middle school kids, and putting together the solar cell
>interface, since we don't have a cubesat to use.
Almost all of our labs are based on a KPC-3+ (as are our real satellites
too). You can see what we do with them on my web page:
http://www.ew.usna.edu/~bruninga/labsats.html
The LABsats are more mature now than when I wrote that page, but this
summer I hope to get the new photos in there and update the page..
>My question
>is this: what is good freeware to decode telemetry that's
>sent from the KPC? While there are still some loose ends to
>make work, I think my kids can do this project with some
>modifications.
My PCSAT.EXE program that decodes and displays all of our spacecraft is
free. (Though I have not made a public release in over a year. Give me a
chance next week, and I will post it.
>Thanks for the idea, and if I can pull it off, I'll let the
>group know (and of course, provide credit where due...)
You'll love some of the other ones. They are even better. Hang the KPC-3
satellites on a string and make them spin with torque motors and or
magnetic coils under remote control. It works here just like in space!
Bob, WB4APR
------------------------------
Message: 5
Date: Wed, 07 Mar 2007 22:35:21 -0500
From: "Jason D. Triolo" <jasonacg_at_citicom.com>
Subject: Re: [aprssig] Re: GPS/PC/D7A
Alex Carver wrote:
>Hi Jason,
>
>Just split the serial cable between the computer and
>the D7. I do this very thing with my setup. I have
>Street Atlas 2007 on my iPAQ and built a Y-cable to go
>between the single GPS receiver and the D7/D700 plus
>handheld. Street Atlas doesn't need to communicate
>back to the GPS receiver so just leave that signal
>line disconnected between them. Two signals (transmit
>and receive) between the radio and the GPS receiver
>and one signal from the GPS receiver to the computer.
A follow-up to this thread:
I went with the split serial cable option, and all that I wanted to do, is
working. The GPS output is being picked up by the D7A, which I can leave in
APRS mode. The PC is also receiving the data for Street Atlas '07 at the
same time. As an added bonus, I was able maintain the data stream from the
D7A back to the GPS, so that local stations get plotted on the handheld GPS
unit's map. So if I can't get the stations plotted on my PC with my current
software, I'll take the compromise.
My approach was to first get the connection working properly between the
GPS and the D7A. Once that was done, I simply "tapped-in" a 3/32" jack on a
short lead, and soldered it all together. When I need the computer
connection, I can just use the same DB9-to-3/32" cable that I already own
for programming and TNC-mode operations, and plug in to that socket. Either
way, the D7A and GPS unit still talk to each other.
The finished assembly is much more compact than I first pictured in my
mind, and is easy to stow away for future needs, when I can't make use of
my mounted D700/Trimble system in my own car.
Thanks to all for the suggestions. KD4ACG-7 is now road-ready :)
73 de Jason, KD4ACG
www.fieldcomm.org/aprs
------------------------------
Message: 6
Date: Thu, 08 Mar 2007 06:55:22 +0100
From: "Jan T. Pharo" <la2bba_at_jpharo.net>
Subject: Re: [aprssig] Re: GPS/PC/D7A
"Jason D. Triolo" <jasonacg_at_citicom.com>, Wed, 07 Mar 2007 22:35:21
-0500:
>I went with the split serial cable option, and all that I wanted to do,
>is working. The GPS output is being picked up by the D7A, which I can
>leave in APRS mode. The PC is also receiving the data for Street Atlas
>'07 at the same time. As an added bonus, I was able maintain the data
>stream from the D7A back to the GPS, so that local stations get plotted
>on the handheld GPS unit's map. So if I can't get the stations plotted
>on my PC with my current software, I'll take the compromise.
That's just the way we do it when using a GPS as a navigational aid on a
boat: The NMEA bus cable is transporting data from the serial port of the
GPS to the VHF radio (so it can transmit the position in an emergency), to
the auto pilot, and to other devices, like e.g. a multi function display,
and it will receive whatever data are going into the bus from other active
devices.
--
73 de Jan, LA2BBA
Hvaler, Norway
------------------------------
Message: 7
Date: Thu, 8 Mar 2007 10:04:39 -0600
From: "Ken Patterson" <kenp_at_etex.net>
Subject: RE: [aprssig] APRS telemetry to the planets
My ham-ticket son was recently in a Navy avionics class in Oceana, across
the bay from Norfolk, Va.
His instructor asked the class if anyone had used a SSB radio before. My
son was the only one in the class to indicate that he had.
de Ken,
N5EQT
EM22lu
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