[hpsdr] multiple rx in Mercury

[John Melton]

As Bruce says I have also been running this code for about a week now
with no problems.  I have 2 of the receivers accessible on the internet
at http://g0orx.homelinux.net/jmonitor.html and have the other 2
available for myself locally.  If I had more uplink bandwidth I could
make more available on the internet.

Currently I also have a softrock sharing the antenna that is putting a
nice signal into it on 7.056MHz.  This Softrock is being used to test a
variation of the ghpsdr3 code to work with Softrocks.  I also have a
UHFSDR that I hope to support with ghpsdr3 soon.  This should also work
with the Softrock v9.  There is also some work ongoing to support the
SDR-1000.

I will be around the TAPR stand next weekend at Dayton as long as the
volcano in Iceland does not cause flight problems from the UK again.  I
look forward to meeting some of you there.

Regards,

John  g0orx/n6lyt



On Fri, 2010-05-07 at 14:18 -0400, Bruce Walker wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Last fall, Kirk Weedman KD7IRS and John Melton G0ORX/N6LYT began an
> effort to implement multiple independent receivers in Mercury.  With
> their help, I revived this project a couple of weeks ago, and I
> integrated some modules which Alex Shovkoplyas VE3NEA had written for
> his multi-band skimmer firmware for QS1R.
> 
> At the moment, I have a version of the Mercury firmware which
> implements four receivers, each of which should be of equal or better
> quality (in terms of its decimation filtering) than the single
> receiver in Mercury V2.9.  It is available for alpha testing from
> repos_sdr_hpsdr/trunk/W1BW/MercuryNRx.  You will need to load
> Mercury/Mercury.jic *and* the corresponding Ozy firmware from the
> OzyJanus directory there.  The Ozy code implements the latest multiple
> receiver USB protocol found in repos_sdr_hpsdr/Documentation.   I have
> not tested whether this Mercury code will work with the released Ozy
> 1.7 code as a single receiver, but it might :).
> 
> At the moment, the only software I'm aware of which supports multiple
> receivers in Mercury is John Melton's ghpsdr3, but I'm hoping that
> making this test version available will enable others to add support
> for it.  John and I have both been running the 4-rx code for the last
> week without problems.  I've been feeding audio from four ghpsdr3
> clients to hacked-up instances of WSPR to monitor and decode weak
> signal digital transmissions on four bands simultaneously.
> 
> I'll continue to work to fit more receivers into Mercury, but more
> debugging is required, and some sacrifice on the decimation filtering
> will also probably be necessary....as I said, my intention for the
> 4-rx version was to be as good or better than the existing single
> receiver, though I don't have any quantitative metric.
> 
> Please let me know if you try it out, successfully or unsuccessfully!
> 
> --bruce W1BW
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