[hpsdr] Latest FPGA code

[John Westmoreland]

Phil,

Wow - sounds great.  Can't wait to give this a try.

73's,
John
AJ6BC


On Wed, Nov 9, 2011 at 4:19 AM, Phil Harman <phil at pharman.org> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>
> **
> All,
>
> We have completed the process of merging Joe's, K5SO, FPGA code and the
> previous releases.
>
> In which case there are new versions of code available as follows:
>
> Mercury_V3.1
> Penelope_V1.6
> Metis_V1.6
> Ozy_Janus_V2.1
>
> The code will be available from the Wiki download page shortly and the
> source is in SVN.  For those using Ozy to load new code, updated programmer
> batch files are available from SVN under ...\USBBlaster-Binaries.
>
> In order to use this new release of code you must upgrade ALL your boards
> to the latest revision.
>
> The new code enables up to four receivers to run on one Mercury board or
> up to four individual Mercury boards to be fitted to the Atlas bus.
>
> Please note that when enabling additional receivers on the one Mercury
> board then the current drawn from the +5v rail will increase as follows:
>
> For a system comprising Metis, one Mercury, Excalibur and Penelope the
> current draw from the +5v rail is:-
>
>      One receiver running = 1.53A
>      Two receivers running = 1.71A
>      Three receivers running = 1.90A
>      Four receivers running  = 2.02A
>
> For a system comprising Metis,  Excalibur and Penelope the current draw
> from the +5v rails with :
>
>     One Mercury board     = 1.53A
>     Two Mercury boards   = 2.4A
>     Three Mercury boards = 3.08A
>     Four  Mercury boards = 3.51A
>
>
> Note that the LPU may not have sufficiant capacity to support additional
> receivers.  Joe has been able to switch the clocks off inside the FPGA to
> Mercury receivers that are not being used.  In this way the current draw
> only increases as you add additional receivers. However, once you have
> selected more than one receiver you can't selected a lesser number without
> first selecting the new number of boards and then cycling the power to the
> Atlas board.
>
> With respect to how Alex operates when using multiple Mercury receivers or
> boards here is what happens:
>
> 1)  When using a single receiver Alex switching is done normally.  That
> is, filter switching is done automatically at the
> frequency break points currently coded unless  "manual Alex control" is
> selected via  the PC in which case the
> PC program controls the filter selection.
>
> 2)  When using multiple-receivers-on-a-single-Mercury mode (i.e., no
> jumper on GPIO pins 2-3 on Mercury and more than one receiver
> requested by the PC) the Alex Tx and Rx filters are set to the "bypass"
> positions.  This is so that the multiple receivers can be
> operated on multiple bands simultaneously from the single antenna;
> the antenna should be a broad band antenna or multi-band antenna in
> this case, of course.
>
> 3)  When using multiple Mercury board mode (i.e., GPIO pins 2-3 jumper  in
> place on Mercury and more than one receiver requested by the PC)  each
> Mercury board controls it's own Alex filter set  (all Mercury boards are on
> the same frequency in this mode and all use identical
> mode, filters, and other operating choice that are made on the (single)
> main PC display and the normal frequency break points for all
> are as in 1) above unless "manual Alex control" is selected via the PC in
> which case the PC program controls the filter selection.
> A number of the PC programs will support multiple receivers and I will
> leave it to the individual authors to announce the availability of their
> code and configuration etc.
>
> I'd like to thank Joe for his tenacity in hunting down a number of
> problems during the code merge and in particular for the code that only
> turns on additional receivers when selected.
>
> Also thanks to the Beta testers for their invaluable input to the testing
> process.
>
> As usual all feedback via the reflector please.
>
> 73 Phil...VK6APH
>
>
>
>
>
>
>
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help:
> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20111109/c1137115/attachment-0004.htm>