[amsat-bb] [hpsdr-dev] Odyssey Siren A success

[Joe Leikhim]

Is there a website where this experiement is described? I tried TAPR but 
couldn't find anything.



    -----Original Message-----
    From: Robert McGwier [mailto:rwmcgwier at gmail.com]
    Sent: Tuesday, March 13, 2007 2:36 PM
    To: High Performance Software Defined Radio Discussion List
    Cc: amsat bb
    Subject: [hpsdr-dev] Odyssey Siren A success


    We had a complete breakthrough on the Odyssey Siren in the past two
    weeks. It will be used in Suitsat 2, in a terrestrial linear repeater
    experiment by Viktor Kudielka OE1VKW and friends, who supported its
    development, and we are already leaping all over the place to
    applications.

    Frank Brickle and I will be doing our SDR code on it over the next
    several days. The board as shown in the schematic needs some
    modifications to fix the 3 - ish volt power supply for the Codec and a
    modified oscillator circuit but we are certain it will all work now.

    On the 10.7 MHz IF, I measured 0 dBm max into a 50 ohm load and less
    than -120 dBm MDS and > 80 dB dynamic range. This is with a BOM of <
    $50 in parts and about a $20 dsp pic chip!

    Yesterday in Rick's lab, with W2GPS, K3IO, we made the above
    measurements, hacked on code and turn the thing into a bent pipe
    transponder. I also did the hilbert transform to make it an inverting
    transponder. It all worked perfectly.

    http://www.cnssys.com/~w2gps/amsat_files/suitsat/

    has detected audio in an SDR-IQ SDR as well as captured IF from the
    SDR-IQ of the transponder. We have to balanced for image and do DC
    offset correction but the thing works and sounds great as you can hear
    for yourself!

    73's
    Bob

N4HY

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

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