Re: [Discuss-gnuradio] Building an RF Front end for DSP FPGA Kits with ADCs

[sirjanselot]

Thanks Marcus.

The reason why I do not want to attenuate is because I want to receive a
high-powered signal and low-powered signal at the same frequency.  

If I attenuate then the low-powered signal will be reduced and if I go
beyond the noise floor, I might see it.  The goal was to stretch the
difference in power between the high-powered signal and the low-power.  But
now if I think about it no matter what I will be limited to my Dynamic
Range.



Marcus D. Leech wrote:
> 
> On 01/13/2011 10:33 AM, Euripedes Rocha Filho wrote:
>> Why not just buy a USRP + WBX?
>>
>> 2011/1/13 sirjanselot <address@hidden
>> <mailto:address@hidden>>
>>
>>
>>     Hello,
>>
>>     I am looking to buy an Altera DSP FPGA Kit (DSP Development Kit,
>>     Stratix III
>>     Edition) for school research but I'm not sure how i am going to
>>     build an
>>     RF-Front End for it.  I am looking to receive signals up to +30
>>     dBm from 30
>>     MHz - 2 GHz with bandwidths up to 50 MHz.  This the kit I am
>>     looking to
>>     purchase:
>>     http://www.altera.com/products/devkits/altera/kit-st3-dsp.html
>>
>>     This kit comes with two 150 MSPS 14-bit ADCs and 250 MSPS 14-bit
>>     DACs.  My
>>     question is it possible to buy a Commercial off the Shelf
>>     Front-End that
>>     provides the necessary inputs?
>>
>>     Is there something special that I have to do in order to receive
>>     signal
>>     levels up to +30 dBm so that my ADCs do not saturate?
>>
> Attenuators.  At +30dBm, the concern isn't saturation, but *device
> destruction*--it would be a shame
>   to destroy your $2800.00 Altera development board.
> 
> 
> 
> -- 
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
> 
> 
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