[Skimmertalk] red pitaya, for real?

[Pete Smith N4ZR]

Just one guy's opinion, but I don't think we'll really know until 
someone runs an RP on CQWW weekend.  RTTY Skimserv is a much heavier CPU 
user- the hottest i7 is none too strong for a big RTTY contest.


My next project here is to compare my RP and a QS1R off the same antenna 
and preamp (through a splitter), both running Skimserv and/or HDSDR.

73, Pete N4ZR
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On 8/31/2016 11:31 AM, kazeringue--- via Skimmertalk wrote:
> Alright, thanks folks.
>
> The Red Pitaya looks pretty interesting just for its capabilities as a 
> test device, which should improve with software over time. That would 
> be a lot of help with testing on the band pass filter projects. I 
> foresee another project..... a bank of W3LPL design rx bandpass 
> filters as a preselector between the antenna and preamp going into a 
> Red Pitaya SDR, and use the Red Pitaya to tune them. [50kw 680 AM 
> broadcast antenna is 1.2 miles from my house]
>
> Being able to run RP as a skimmer server would be a big bonus.
>
> Idle speculation, the high impedance on the inputs is there for its 
> use as a scope/test instrument.  Bypassing them per K1TTT jumper fix 
> might be easier than trying to match them for SDR use. Figuring out a 
> good match for the amp block following JP5 might be worth the time 
> tinkering.
>
> Interested to hear more from Dai on the S9-C also.  More options is good.
>
> So, one last question.  What sort of CPU is sufficient for a Red 
> Pitaya based SDR?  What sort of CPU's have been used and what sort of 
> CPU % usage is the skimmer server drawing?
>
> I have been running up to five softrocks on a single Dell core 2 quad 
> box(2 physical threads, 2 virtual threads) under windows 8.1.  With 
> all five running on a contest weekend, the CPU is over 50%, usually 
> closer to 70%.  The tough part of that kludged skimmer station was 
> finding five different sound devices that could coexist. (Four plus 
> the onboard sound.)  Since the 15m softrock kludge generates more bad 
> mirror image spots than the others, I generally just run four 
> skimmers, 160/80/40/20.
>
> 73 de w4kaz
>
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