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

Joe Leikhim rhyolite at nettally.com
Wed Mar 14 18:26:09 PST 2007

Thanks Drew!

Andrew Glasbrenner wrote:

> Try this: http://hpsdr.org/wiki/index.php?title=ODYSSEY
> 73, Drew KO4MA
> ----- Original Message ----- From: "Joe Leikhim" <rhyolite at nettally.com>
> To: <amsat-bb at amsat.org>; <rwmcgwier at gmail.com>
> Sent: Wednesday, March 14, 2007 9:55 PM
> Subject: [amsat-bb] [hpsdr-dev] Odyssey Siren A success
> 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

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

"Follow The Money"  ;-P

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