[hpsdr] OZY II: USB vs Ethernet ?

[Jeremy McDermond]

On Mar 7, 2010, at 11:11 PM, Curt, WE7U wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> On Mon, 8 Mar 2010, Phil Harman wrote:
>
>> With the prototype OyzII I can attach it to my home network and  
>> access it
>> from any PC - that may be of interest to some folks.
>
> Think bigger...  No reason to limit access to your home network.
> You could access it via Clearwire or cell-phone networking from a
> vehicle.  Access it from 802.11 access in a restaurant or clubhouse.
> Plug into a friend's network and access your home station.  Of
> course accessing it from a wireless laptop in/near my home would be
> fun too.

Remember that what's going to be coming out of Ozy II is I/Q samples  
at whatever your sample rate is.  192000 24 bit samples per second is  
around 4.6Mbit of sustained data.  That's not counting any overhead  
from ethernet, UDP, and the C&C bytes from Ozy.  Most residential  
connections won't support 5Mbit of sustained upstream right now.  But  
it might become more interesting as bandwidth increases.

The better model for what you're proposing, for now, is the one that  
John Melton is working with, which is to do the DSP processing and  
shove out audio streams that are a lot leaner.

>
> For Field Day:  Put the SDR radios near their antennas but widely
> separated from other radios.  Connect them all together with
> ethernet or 802.11.  Set up the tents wherever you like as they
> don't have to be near the radios or antennas.
>
> Long-shot:  Might even interest people in creating/maintaining
> high-speed RF networking to access various SDR radios in the area.
>
> -- 
> Curt, WE7U.                         <http://www.eskimo.com/~archer>
>  APRS:  Where it's at!                    <http://www.xastir.org>
> Lotto:  A tax on people who are bad at math. - unknown
> Windows:  Microsoft's tax on computer illiterates. - WE7U.
> The world DOES revolve around me:  I picked the coordinate system!"
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--
Jeremy McDermond (NH6Z)
Xenotropic Systems
mcdermj at xenotropic.com




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