[amsat-bb] Re: QubeSat structure question and PSK31 Xponder

Robert Bruninga bruninga at usna.edu
Fri Apr 23 09:38:20 PDT 2010

> I am looking for a way to have a total space of a 1U (10cm x 
> 10cm x 10cm) CubeSat, of which 0.5U (10cm x 10cm x 5cm) is 
> used for electronics and battery and the other 0.5U will be 
> used for light weight deployable solar panels.

Our next two cubesats have four deployable solar panels as shown
on this old web page: www.aprs.org/psat.html The mission and
design is very current and manifest, its just that we don’t
maintain a web page any more.

Each cubesat has a free 8.5 cm cube volume for an auxilliary
payload.  We have identified a non amateur payload for one of
the cubesats, but I am hoping to fill the other one with an
amateur payload (which is still TBD, though we are manifest for
launch in next March.

I was thinking about asking the AMSAT community to built a PSK31
28 MHz uplink and 435.xxx FM downlink transponder, but did not
want someone to invest a lot of time in something that might not

But I think we are getting to that point.  So if someone wants
to get a free ride to space and risk building a PSK31 linear 28
MHz uplink receiver and UHF FM downlink .5 watt transmitter
downlink, then maybe we should start working together.  You can
see that
This PSK3-1 transponder can be completely self contained and has
its own access to space for its deployable antennas because it's
entire volume just slides in from the bottom.  It can be flown
or not flown based on last minute decisions independent of the
rest of the design.

Ill find a link to our PSK31 transponder designes used on PCSAT2
and on RAFT.

Bob, Wb4aPR

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