[hpsdr] Multiple Rx instances on HPSDR

Mon Jun 21 14:38:39 PDT 2010

Doug, W5WC, and I have begun working to port John's ghpsdr3 to the 
Windows environment.  We have server and dspserver, compiled using 
Visual Studio 2003, 2005, or 2008, working with John's jmonitor.  At the 
moment we have it working with only one receiver, but work is continuing 
to raise the number.

I'm currently using the Mercury FPGA code from W1BW that is written for 
up to four simultaneous independent receivers.  In principle, one should 
initialize Ozy with the corresponding Ozy_janus.rbf and ozyfw-sdr1k.hex 
files, but I find it doesn't work.  Instead I use the Ozy files 
corresponding to Mercury 2.9a.  (more work ahead)
Dave
WA8YWQ

dave powis wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>   
>
> ------------------------------------------------------------------------
>
> 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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