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[aprssig] PCSAT-3 opportunity?

Robert Bruninga bruninga at usna.edu
Wed Jun 27 13:11:13 UTC 2007


> FWIW I'm in the process of laying out a stripped down TNCx 
> that has an XDigi on the same board for the Cubesat Program 
> at Auburn University.  If you like, you can use the same 
> board for the new PCSAT.

So can I assume a 3.5" square board? And height of .4" or so?

Bob
> 
> John W2FS
> 
> -----Original Message-----
> 
> From:  "Robert Bruninga" <bruninga at usna.edu>
> Subj:  RE: [aprssig] PCSAT-3 opportunity?
> Date:  Tue Jun 26, 2007 12:53 pm
> Size:  3K
> To:  "'TAPR APRS Mailing List'" 
> <aprssig at lists.tapr.org>;"'Curt Mills, WE7U'"
<archer at eskimo.com>
> 
> Plenty of time for the flight board.  A year maybe.  Just need
> to size the device.  Must be smallest possible to improve
> chances of a rid.  Two options:
> 
> 1) 145.825 RX/TX + TNC digipeater for APRS 
> 2) 28.120 MHz RX for PSK-31 + TX FM on 145.825
> 
> No GPS (not enough power avail).
> 
> Bob
> 
> > -----Original Message-----
> > From: aprssig-bounces at lists.tapr.org 
> > [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of 'Scott
> Miller'
> > Sent: Tuesday, June 26, 2007 12:41 PM
> > To: 'Curt Mills, WE7U'; 'TAPR APRS Mailing List'
> > Subject: RE: [aprssig] PCSAT-3 opportunity?
> > 
> > If you're talking about the one that fit in the original 
> > OpenTracker case
> > (with a hole in the board) then you're right, only a few of 
> > those were made,
> > though I've got a big stack of unused boards.  Trouble with 
> > those was that a
> > routing error in the oscillator circuit made them really 
> > flaky.  Those SMT
> > crystals are hard to mount properly anyway, and with the 
> > board error only
> > about 50% of the ones I built actually worked.  The T2-135
is 
> > mostly the
> > same circuit, but with a better layout, and has never had 
> > that problem.
> > 
> > The T2-135 would probably be usable itself, but the 
> > connectors aren't really
> > ideal.  If there's no rush, I can spin a new board rev in a 
> > couple of weeks.
> > I can get prototypes faster of course, but the cost climbs 
> > fast as lead
> > times decrease.
> > 
> > As I mentioned in the last email, I'm already working on a 
> > board that mates
> > with a commercial radio board, so it'll have all of the 
> > signals needed on a
> > 0.1" pin header.  Might not be the right levels for another 
> > radio, though.
> > Here's a picture of the radio in its housing, with RF board
> and TNC
> > installed:  http://n1vg.net/opentracker/images/dtx-plus.jpg
> > 
> > Scott
> > N1VG
> > 
> > > -----Original Message-----
> > > From: aprssig-bounces at lists.tapr.org 
> > > [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Curt,
> WE7U
> > > Sent: Tuesday, June 26, 2007 8:51 AM
> > > To: TAPR APRS Mailing List
> > > Subject: Re: [aprssig] PCSAT-3 opportunity?
> > > 
> > > On Tue, 26 Jun 2007, Jason Winningham wrote:
> > > 
> > > > Tracker2.  digipeater, remotely
controllable/configurable.
> > > 
> > > I have one such in my hands, but I don't think very many
of
> them
> > > were made.  Surface/mount Tracker2.  Tiny tiny tiny.
Maybe
> Scott
> > > has another one floating around, but I think there was a
> minor
> > > problem with the clock circuit on this board or with one
of
> the
> > > components on the S/M version.
> > > 
> > > I don't know if he's planning to create any more of these
> right now.
> > > The T2-135 board may also qualify and is S/M too I think,
> but is
> > > probably somewhat bigger.  I know he's produced several of
> these.
> > > 
> > > It'd definitely be worth asking Scott.
> > > 
> > > --
> > > 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!"
> > > 
> > > _______________________________________________
> > > aprssig mailing list
> > > aprssig at lists.tapr.org
> > > https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> > > 
> > > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > aprssig mailing list
> > aprssig at lists.tapr.org
> > https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> > 
> 
> 
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