[amsat-bb] Re: [Discuss-gnuradio] OLPC - next generation with SDR?

Frank Brickle brickle at pobox.com
Fri Dec 21 20:31:13 PST 2007

John --

Have you looked at all at the Siren board? It's  part of the HPSDR and
Suitsat II projects: a low-power, low-cost SDR engine using the dsPIC33F
embedded controller from Microchip. The current design uses 10 MHz RF in and
out, and the QSD and QSE for complex sampling and excitation. There is also
an onboard TI stereo codec for I/O in the audio range. Digital data can be
synchronously imported and exported over one or more SPI buses.

It's not perfectly general. Many of the algorithms we'd like to run on it
need to be tailored to the hardware in a way that's more constrained than
we'd like in general. That notwithstanding, it should be capable of handling
48 kHz bandwidth, and muxing and demuxing several channels within that span.

So far, as far as I know, only prototypes and first-gen boards are in
circulation. The power consumption is already very low; there's a lot of
board real estate eligible for shrinking as well.


On Dec 21, 2007 11:02 PM, John Gilmore <gnu at toad.com> wrote:

> > The thing does appear to have sufficient horsepower to do some DSP.
> > ...

More information about the AMSAT-BB mailing list