[hpsdr] OZY II: USB vs Ethernet ?

[Phil Harman]

John,

Perhaps in the OzyII FPGA would could send 192kHz  I and Q samples, say 10 
per second, for the bandscope and also 4kHz I and Q samples in real time for 
demodulation  - not as efficient as your process but quite straightforward 
to code.  Next step could be to do the FFT in the FPGA but that will require 
a bit of research.

73's Phil.... VK6APH

----- Original Message ----- 
From: "John Melton" <john.d.melton at googlemail.com>
To: "Curt, WE7U" <curt.we7u at gmail.com>
Cc: "Phil Harman" <phil at pharman.org>; <hpsdr at lists.openhpsdr.org>; "John 
Petrich" <petrich at u.washington.edu>
Sent: Monday, March 08, 2010 4:19 PM
Subject: Re: [hpsdr] OZY II: USB vs Ethernet ?


> With the current broadband uplink/downlink speeds available it would not
> be very feasible to send the I/Q data across the internet but it does
> make a lot of sense across a home network.
>
> The I/Q data for a single Mercury receiver running at 192K requires 9Mb
> bandwidth (192000*3*2*8).  Running 8 concurrent receivers in Mercury at
> 192K requires 72Mb.
>
> My 'up to 20Mb' broadband is running at about 6Mb downlink and 400Kb
> uplink.  Doesn't stand a chance ;-)
>
> However, it does make a lot of sense to perform the dsp work on a server
> and just send the spectrum data and the audio stream to a client over
> the internet.
>
> You can see an example of this with my internet Mercury receiver at
>
>     http://g0orx.homelinux.net/jmonitorapplet.html
>
> The client is requesting the spectrum data 10 times per second and each
> request if for 480 bytes.  The audio is converted to 8000 samples per
> second and is sent as 8 bit uLaw.  So the total bandwidth required is
> just 120kb (((480*10)+8000)*8).
>
> -- John g0orx/n6lyt
>
>
>
>
> On Sun, 2010-03-07 at 20:11 -0800, 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.
>>
>> 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.
>>
>
>
>


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