[hpsdr] SunSDR2 - new TRX

[Werner Karn]

Alex, Joe,

will this also allow for direction finding and antenna steering per
software ? 4 or7 receivers on the same frequency should allow for a good
gain in wanted and nulling in unwanted direction.

73,

Werner

2012/6/3 Alex VE3NEA <alshovk at dxatlas.com>

> ***** High Performance Software Defined Radio Discussion List *****
>
> 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/<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
>>
>>
>>
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