[hpsdr] Latest FPGA code

[Joe Martin K5SO]

Bruce,

1)  Yes, of course, and moving Excalibur off the Atlas bus may be the  
way I will choose to use four Mercury boards, in fact.

2)  As I recall, all Mercury boards did not have an Alex filter set  
(Tx and Rx) connected when I installed them on the Atlas bus for the  
current measurements, even though using Alex filters is my normal  
configuration, except for the four Mercury board case in which the  
fourth Mercury board certainly did not have an Alex filter set  
attached as I only have three Alex sets; however, I don't trust my  
memory absolutely so if it's critical for you please make the  
measurement yourself, or let me know and I can do it more  
carefully...at the time I was more concerned that the FPGA code  
actually worked and only wanted a ball park current measurement to get  
an indication of how far out of spec the LPU was likely to be with  
multiple-receivers-on-a-single Mercury board.

73,  Joe K5SO

On Nov 9, 2011, at 3:14 PM, Bruce Beford wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>> In that one case, i.e., the four Mercury board case, the  
>> configuration
>> was one Metis, four Mercury boards, one Excalibur  (no Penelope).   
>> The
>> current values reported are measured values, not theoretical values.
>
>> 73, Joe K5SO
>
> Thanks for the clarification, Joe.
>
> One -could- create an Atlas-based system with (4) Mercuries, (1)  
> Penelope
> and (1) Metis board, with an Excalibur off-bus, hard-wired to the  
> bus, but
> not occupying a slot.
>
> Q: Did the 5v rail current measurements with 3 or 4 Mercury boards  
> include
> an Alex set on each? Not a major item, again one could just  
> calculate the
> added load to the 5 and 12v supplies.
>
> Thanks!
> Bruce, N1RX


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