[hpsdr] Multiple Rx instances on HPSDR

[John Melton]

Magister is an Ozy without the parallel port interface for controlling
an SDR-1000.  The Ozy code is the same for both Magister and Ozy.

The Mercury code is the limiting factor at the moment.  The FPGA in
Mercury is just about full with 3 receivers and needs some work to
squeeze the code down. The code in Ozy currently will support 8
receivers so is ready when Mercury will support it.  The number of
receivers is configured in the USB data sent to Ozy/Magister.

It is also possible to use multiple Mercury receivers.  I tested with
two cards and it is working.

Regards,

John g0orx/n6lyt

On Mon, 2010-06-21 at 20:04 +0000, dave powis wrote:
> Thanks John,
> 
> At least this begins to answer my questions, although it also opens
> more up, of course!
> 
> From reading the HPSDR decsriptions, I was looking to try and use a
> Mercury Rx, with a Magister Interface on the 
> Atlas backplane.  But if I read your reply correctly, the 8Rx
> functionality is only in Ozy at the moment - and it seems that it is
> this that is the issue of capacity, rather than the Mercury board?  Is
> it planned to migrate this across to the Magister FPGA at some point?
> I assume that the FPGA's are re-programmable with new firmware?
> 
> In my application, the segments monitored will remain fixed once the
> system is running, so upstream control requirements will be minimal.
> My objective at the moment is to identify the architecture for the SDR
> and the PC that will provide the necessary Rx's
> 
> Thanks & 73,
> Dave
> 
> 
> 
> ______________________________________________________________________
> From: John Melton <john.d.melton at googlemail.com>
> To: dave powis <g4hup at btinternet.com>
> Cc: hpsdr at lists.openhpsdr.org
> Sent: Monday, 21 June, 2010 20:43:30
> Subject: Re: [hpsdr] Multiple Rx instances on HPSDR
> 
> Hi Dave,
> 
> currently the FPGA code is only supporting 3 receivers.  The code
> needs
> some more work to squeeze all the receivers in.  The Ozy code can
> support 8 receivers.  I have only been able to test this on
> Mercury/Ozy.
> 
> Currently, PowerSDR does not support the multiple receivers.  There is
> some work going on to put multiple receivers in KISS Console.
> 
> As far as I know only my Linux software will support multiple
> receivers.
> 
> The architecture is a server that interfaces to the HPSDR hardware and
> splits out the RX I/Q data streams into separate UDP data streams with
> a
> TCP control connection for sending frequency and control commands.  I
> have a version of my ghpsdr software that is a receiver only client
> that
> works with this server.  The server can run on the same machine as the
> clients or on different machines.
> 
> I also have a dspserver that I am playing with for internet access to
> the HPSDR hardware.  The dspserver acts as a client for a receiver
> connected to the HPSDR hardware server.  It handles all the DSP
> processing and allows an internet client (Java Applet) to connect to
> it
> and it will stream audio and spectrum data to the client at a much
> lower
> data rate than streaming I/Q data.  Currently it is about 100Kb/sec if
> the spectrum is updated 15 times per second.  You can run multiple
> dspservers, one for each receiver.
> 
> I am currently running the HPSDR server and 3 dspservers along with
> the
> Apache web server on an Atom 330 system with 2GB memory.  It does not
> seem to have any problems with running these.
> 
> I have 2 availabel on the internet and the third allows me to always
> have access.
> 
> You can try this out by going to:
> 
> http://g0orx.homelinux.net/jmonitor.html
> 
> Let me know if you need any more information.
> 
> Regards,
> 
> John g0orx/n6lyt
> 
> On Mon, 2010-06-21 at 19:10 +0000, dave powis wrote:
> > ***** High Performance Software Defined Radio Discussion List *****
> > 
> > Hi all,
> > 
> > I'm looking for a monitoring solution that will allow multiple
> > independent Rx's to run on one piece of SDR hardware.  The
> > descriptions for the HPSDR Mercury Rx and Hermes Tcvr seem to
> indicate
> > that they can indeed operate up to 8 independent Rx's off a single
> > common antenna input.  This will suit my application ideally.
> > 
> > However, what is not clear from the hardware descriptions is what
> the
> > software requirements and PC limitations are.  
> > What SDR apps will allow up to 8Rx's to be configured?  
> > Or is it a case of running multiuple instances of the same SDR
> > software simultaneously - eg PowerSDR?
> > Are there any recommendations for the PC performance required to
> > support this?
> > 
> > 
> > Thanks for any help in answering these questions!
> > 
> > 73,
> > Dave, G4HUP
> > 
> > 
> > _______________________________________________
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> 
> 



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