[hpsdr] HPSDR and Beamforming

[Eric Blossom]

On Thu, Sep 14, 2006 at 10:16:20AM +0800, Murray Lang wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Thanks Phil
> 
> I am looking at using GNU Radio (software) for experimentation. I've 
> recently got myself another oldish PC to run Linux for that purpose. Not 
> sure what the device driver situation is but if everything was straight 
> forward it would be boring I suppose.
> 
> While I've got you, can you see any showstoppers in the idea of an external 
> phase shifting unit based on the LTC2208? I am imagining a scenario where 
> the LTC2208 samples a signal from any old ham rig under the control of an 
> FPGA. The FPGA transfers the data to a circular buffer in DDR RAM, waits 
> some programmable period, then reads the data and sends it to a DAC. I 
> suppose the FPGA speed and amount of RAM required would limit operation to 
> HF. It wouldn't matter about the overall processing delay because all of 
> the units would be the same. However the resolution of the system would be 
> limited by the time taken to write then read the RAM. The units would 
> obviously be synchronised to the same clock and I imagine a gyro input 
> would be useful to correct for vehicle or vessel rotation. I reckon such a 
> unit would sell like hotcakes.
> 
> Murray
> VK6HL

Hi Murray,

Let me know if you've got any questions about GNU Radio, or getting
the new hardware talking to it.  I don't expect that it'll be too much
trouble.

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There are lots of people interested in beam forming and/or MIMO on the
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73, Eric K7GNU

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