[Skimmertalk] Pre-amp for Red Pitaya?

[Nathaniel Frissell]

Hi, Dai.

Could you please elaborate on “confirm intermodulation by HPSDR and control front end gain for the Red Pitaya”? Where in the document do you want me to add that?

Also, for the 10 bit Red Pitaya, what do you mean by “if handled properly”? Do you have some comments regarding how it compares to the 14 bit Red Pitaya?

Thank you for doing your comparisons. If it is ok, I’d like to link my how-to page to your comparison page.

73,
Nathaniel W2NAF

> On Jun 5, 2017, at 7:21 PM, Dai NAGAKURA <ndai at cameo.plala.or.jp> wrote:
> 
> 
> 
> On Mon, 5 Jun 2017 18:51:58 -0400
> Nathaniel Frissell <nafrissell at gmail.com> wrote:
> 
>> Hi again,
>> 
>> For some more context, we are working on writing-up a how-to document for setting up a multiband skimmer for hamsci.org <http://hamsci.org/>. You can see the how-to here: http://hamsci.org/rbn-howto <http://hamsci.org/rbn-howto>.
> 
> Pse add
> 
> " Confrim Intermodulation by HPSDR 
> and controle front end gain of Red Pitaya "
> 
> In My comparison of three SDRs
> http://59925.org/misc/SkimServ_SDR_comparison/
> 
> Capture ability on CW SkimServ is S9C>Red Pitaya>QS1R
> S9C needs NOT preamp.
> and even 10bit Pred Pitaya is good enough for SkimServ if handled
> propery.
> 
> Dai JF2IWL
> 
> 
> 
> 
> 
> 
>> 
>> We are currently running 2 red pitaya-based skimmers at Jenny Jump in Hope, NJ (http://hamsci.org/article/new-rbn-receivers-new-jersey <http://hamsci.org/article/new-rbn-receivers-new-jersey>). K2MFF-2 is connected to an DXE ARAV3-1P, and K2MFF-3 is connected to a DXE RF-PRO-1B. They are skimming identical bands, but k2mff-2 does much better than k2mff-3. We are not using preamps.
>> 
>> Please let me know if you have suggestions for the how-to document. I really appreciate it!
>> 
>> 73,
>> Nathaniel W2NAF
>> 
>> 
>>> On Jun 5, 2017, at 4:32 PM, Nathaniel Frissell <frissell at vt.edu> wrote:
>>> 
>>> Hi, everyone.
>>> 
>>> Does anyone have experience using a pre-amp with a Red Pitaya?  If so, what do you use? Would this one from DXE be a good choice? https://www.dxengineering.com/parts/dxe-rpa-1 <https://www.dxengineering.com/parts/dxe-rpa-1>
>>> 
>>> Thanks and 73,
>>> Nathaniel W2NAF
>> 
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> 
> -- 
> Dai NAGAKURA <ndai at cameo.plala.or.jp>
> 
> -- 
> Dai NAGAKURA <ndai at cameo.plala.or.jp>
> 
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