[hpsdr] SunSDR2 - new TRX

[Alex VE3NEA]

Joe,

My 7-channel FPGA code is released under the GPL license and is available at 
several places on the Internet, including the HPSDR SVN server:

(http://svn.tapr.org/repos_sdr_hpsdr/trunk/VE3NEA/7_channel_Verilog/)

Feel free to use this code in your work.

I am really hoping that Hermes is capable of receiving on all Ham bands 
simultaneously. Please let me know if there are any bottlenecks in the hardware 
that make this impossible.

73 Alex VE3NEA




-----Original Message----- 
From: Joe Martin K5SO
Sent: Sunday, June 03, 2012 3:19 PM
To: HPSDR list
Subject: Re: [hpsdr] SunSDR2 - new TRX

***** High Performance Software Defined Radio Discussion List *****

Hi Alex,

The 4 Rx implementation we use simply copies the code for a single Rx into other 
locations for the multiple receivers, so size required scales linearly with the 
number of receivers implemented.  If that approach is taken, no more than four 
such units will fit in the FPGA (with all the Tx and other code that is present 
in Hermes).

Without knowing specifically how you implement your 7 receivers I really can't 
comment definitively on the differences.  I imagine that you can comment on that 
better than I.  Is it possible that in your QS1R code you use less decimation in 
the FPGA (resulting in a coarser step resolution) and then perhaps later apply 
more processing/decimation to the stream on the PC side?  Or is the additional 
overhead of ethernet, transmit, and other features inherent in the Hermes FPGA 
taking up the additional space that the Rx-only QS1R doesn't have to worry with?

73,  Joe K5SO

On Jun 3, 2012, at 12:32 PM, Alex VE3NEA wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Joe,
>
> I am very surprised that only 2 or 3 receivers is the realistic loading of 
> Hermes. I have 7 receivers implemented in the EP3C25 FPGA of QS1R, and I was 
> hoping that Hermes, with its EP3C40 chip, would allow even more receivers. 
> What is the bottleneck?
>
> 73 Alex VE3NEA
>
>

_______________________________________________
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/ 


 1338752618.0