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Re: Proposal: SDR-DSP receiver (was: Re: Cube sat and DSPs (was Re: cube sat))



Is the USRP the board with a Cypress USB controller, Spartan-2E FPGA and AD6644
ADC?

73,

John
KD6OZH

----- Original Message -----
From: "Robert McGwier" <rwmcgwier@comcast.net>
To: "AMSAT Bulletin Board" <amsat-bb@AMSAT.Org>
Sent: Tuesday, 30 March, 2004 13:40 UTC
Subject: RE: Proposal: SDR-DSP receiver (was: Re: [amsat-bb] Cube sat and DSPs
(was Re: cube sat))


> Sign me up.  The more the merrier.
>
> AB2KT and I have written for Linux and Windows, using gcc, fftw,
> VSIPL a signal processing chain to do ssb,cw,am (synchronous and
> rectifier), and fm.  For Linux, I am using Qt,  Python/Tk, and some
> others to build GUI interfaces and we will be using XML to a command
> interpreter.  We are using Hamlib to control the SDR-1000.  We want
> to have it remoteable the day we give it out. It is multithreaded from
> the get-go.   This code is not yet released because I want to do the
> first cut at the GUI, Frank and I want to do a first version of the
> command interpreter, and to get it all glued together but our goal
> is finished with round 1 by the end of April.  You will not likely
> be ready for Alpha test by then so you will have code awaiting you.
>
> For your information, the USRP, Universal Software Radio Peripheral,
> is in alpha test.  I have one and will fire it up and start working
> with it once the SDR-1000, SDR-Linux code is out.  It has a 65 Mhz
> A/D and CIC downsampling filters being done by FPGA and lastly,
> a USB 2.0 interface to the computer.  This is an open hardware and
> open software project.   Given your desire to user a wider part
> (more bits), I could easily use it and would welcome that.
>
> Bob
> N4HY
>
>
> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of Achim Vollhardt
> Sent: Tuesday, March 30, 2004 6:03 AM
> To: AMSAT Bulletin Board
> Subject: Proposal: SDR-DSP receiver (was: Re: [amsat-bb] Cube sat and
> DSPs (was Re: cube sat))
>
>
> Hello Hams,
>
>  ----------------------  SNIP ---------------
>
> Proposal is to is a 65 MSPS ADC with the digital down converter and
> DSP.. so possible reception would be somwhere between 0.1 and 30 MHz.
> Perhaps direct reception of the aliased image of 144 MHz (at 14 MHz)
> would be possible as well.. a common problem like bad large signal
> performace is negligible as we deal with sat-downlinks.. we don't have
> large signals!!
>
> What I have:
>
> - a basic idea how this works
> - some sample devices
> - experience in layouting and a PCB company at hand.. :)
>
>
> What I need:
> - more people willing to join (!)
> - some techies to iron out the bumps.. ;)
> - some DSP coders.. I started digging into it but with some experience,
> things like SSB, FM, AM and CW demodulation is a piece of cake..
> - more ideas: this baby could also handle PSK31 or high speed PSK
> decoding (anybody interested in decoding the deep-space probes?),
> digital voice encoding (with forward error correction!).
>
>
>
>
> I think this is a real challenge.. when keeping all open-source, this
> could be a wonderful project pushing the limits !
>
> Hpoing to trigger some discussion..
>
> 73s, Achim, DH2VA
>
>
>
>
>
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>


----
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