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[aprssig] PCSAT-3 opportunity?

john at coastalchip.com john at coastalchip.com
Tue Jun 26 21:35:00 UTC 2007


Bob,

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.

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
> > 
> > 
> 
> 
> 
> 
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> aprssig at lists.tapr.org
> https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 


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