[hpsdr] Odyssey SDR Rev. B Schematics

[Bob McGwier]

The files are committed to Odyssey svn respository.


Steven Bible wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Gang,
>
> We've been busy with Odyssey, the SDX for SuitSat-2.  
>
>      http://hpsdr.org/wiki/index.php?title=ODYSSEY
>
> Rev. A Design
>
> The Rev. A SDX PCB's arrived last week.  This weekend I started populating them starting with the power supply first.  I hope to have these fully populated and sent to Bob's N4HY team for DSP programming.
>
> This philosophy behind this design is to use circuitry that we know has been tried and tested.  We wanted a safe low risk design.  The codec is the TLV320AIC23B.  This design is by Joe N9WXU.
>
> Rev. B Design
>
> In the background, I've been working with Ahti's OH2RZ ISD design (which is a progression of Bob N4HY and Phil C's N8VB ISD work - see schematics on the HPSDR SVN and Phil's Blog).  The goal of this circuitry is to design a fully differential circuit for input (ISD) and output (exciter) to create a low-noise circuit and also to get to a signal power supply.  The input (ISD) follows Ahti's work.  I've made a few additions to Ahti's work after reading a number of application notes, and to add a few extra components that we can use at the time of testing (a follow up PCB would be designed from the lessons learned from this board).  We've already had a short discussion of this about a month ago on the HPSDR list (see HPSDR archives).  
>
> On the Odyssey Wiki, I've posted Rev. B schematics.  In this design I've incorporated the changes from the discussion a month ago and added an exciter circuit.  Thanks to Howard Long G6LVB, at the AMSAT Symposium we discovered that we were both working on very similar projects (see STELLA http://www.g6lvb.com/Articles/STELLA/index.htm).  He has a exciter circuit that I've added.  We really need your comments on this circuit.  What would a fully differential exciter look like?  My concern is that the OPA1632 can drive 50 ohms.  But Howard has been successful as he demonstrated his hardware at the 2006 AMSAT Symposium.  
>
> Thanks everyone,
>
> - Steve N7HPR
>
>
>
> \r\n- Steve\r\n  (n7hpr at tapr.org)\r\n
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>   


-- 
Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540
(609)-924-4600
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