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<DIV>Hi Joe, thank you , understand , too bad I just received my dual Mercury
boards . In any case I have lot to learn from this platform .</DIV>
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<DIV>73</DIV>
<DIV>Jacques F6BKI</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=k5so@valornet.com
href="mailto:k5so@valornet.com">Joe Martin K5SO</A> </DIV>
<DIV><B>Sent:</B> Saturday, August 04, 2012 9:35 PM</DIV>
<DIV><B>To:</B> <A title=hpsdr@lists.openhpsdr.org
href="mailto:hpsdr@lists.openhpsdr.org">HPSDR list</A> </DIV>
<DIV><B>Subject:</B> Re: [hpsdr] Introducing Angelia</DIV></DIV></DIV>
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<DIV
style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">*****
High Performance Software Defined Radio Discussion List *****<BR><BR>
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<HR>
Hi Jacques,
<DIV> </DIV>
<DIV>As Abhi is likely in bed at the moment I'll respond to your inquiry.
</DIV>
<DIV> </DIV>
<DIV>The biggest difference between multiple Mercury and Agelia (pronounced
ain-jell-LEE-uh) platforms is that the ADCs in Angelia are truely coherent,
whereas the ADCs in multiple Mercury platforms are "almost" coherent. In
practice, this means that Angelia will perform critical phasing activities
better than does a multiple Mercury platform, especially over extended periods
of operation. </DIV>
<DIV> </DIV>
<DIV>For example, I was never quite able to adequately solve a couple of
disturbing issues related to maintaining a fixed and stable phase relationship
between the ADCs on multiple Mercury boards over long periods of time or between
multiple Mercury boards at initial startup. At initial power up of the
Atlas bus the Mercury boards presently do not come up with fixed and repeatable
phase relationships of their output IQ streams and there is a tendency of the
Mercury boards to develop a seemingly random phase shift on one or more of the
Mercury boards sporadically as they operate. These two issues do not exist
with Angelia…indeed, solving these two critical issues was a principal driving
force for proceeding with Angelia's development! Angelia solves these
problems. </DIV>
<DIV> </DIV>
<DIV>This does not mean that it is impossible to resolve the startup-phase and
random-phase-jump issues with multiple Mercury boards but I'm thinking that a
solution would likely turn out to be considerably "less clean" than using the
straightforward approach to the issue that is implemented in Angelia.
</DIV>
<DIV> </DIV>
<DIV>For the time being, the PC programs that run with multiple Mercury
platforms also run similarly on Angelia, with the caveat that at present
only two coherent receivers are implemented in Angelia firmware (…note that up
to 7 incoherent/independent receivers may be used with a single ADC in Angelia,
however). The present two-coherent-receiver limit for Angelia will soon be
expanded to three (or possibly to four) coherent receivers for Angelia when the
Angelia daughterboard development is completed. It has been a design
objective of the Angelia project to make Angelia backward compatible with the
current HPSDR PC software programs. So far that objective seems to have
been met, including operation of multiple independent receivers and operation of
up to two coherent receivers. </DIV>
<DIV> </DIV>
<DIV>It is expected that firmware/software developed for Angelia will continue
to adhere to the USB protocol that is established for the OpenHPSDR project; so,
in that respect, software that runs on OpenHPSDR hardware will also run on
Angelia and vice versa, up to the phasing limitations imposed by the particular
set of hardware you are using, of course. If your hardware doesn't contain
multiple coherent receivers then the phasing functionality of a "phasing" PC
program will not be present but the program will likely function perfectly well
otherwise. </DIV>
<DIV> </DIV>
<DIV>I hope that answers your questions adequately. If not, please ask
again. Also, Abhi may wish to add his comments. He, or anyone else
for that matter, is welcome to correct me if I have misspoken or have poorly
explained something. </DIV>
<DIV> </DIV>
<DIV>73, Joe K5SO</DIV>
<DIV> </DIV>
<DIV>
<DIV>
<DIV>On Aug 4, 2012, at 1:07 PM, <<A
href="mailto:f6bki@orange.fr">f6bki@orange.fr</A>> wrote:</DIV><BR
class=Apple-interchange-newline>
<BLOCKQUOTE type="cite">***** High Performance Software Defined Radio
Discussion List *****<BR><BR>
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<DIV>ABhi, What is going to be the difference between the multiple
Mercury platform and Angelina as far diversity and beam forming is
concerned ? are the software developed for one can be used for the other ? is
the issue of phase at start up you have describe on Mercury solved
?</DIV>
<DIV>Thank you</DIV>
<DIV>73</DIV>
<DIV>Jacques F6BKI</DIV>
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