[aprssig] PCSAT-3 opportunity?

[Robert Bruninga]

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!"
> > 
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> > 
> > 
> 
> 
> 
> 
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