[Skimmertalk] RedPitaya 125-10 vs 125-14

[Dave Pascoe]

I don't have a 10-bit Red Pitaya but I do have several QS1R's and a Red
Pitaya 14-bit SDR. I have compared a many days of results between the QS1R
on 80-10m and a Red Pitaya on 80-10m, both fed from the same antenna(s)
through a known equal power divider network. These comparisons were also
done through a few contests by now. I have found the Red Pitaya to be every
bit as good as the QS1R (produces same volume of spots, +/- a very small %
variance) and would not hesitate to recommend it as a replacement.

Whether a 10-bit vs. 14-bit Red Pitaya make sense for a given location, the
first thing I would look at is the external noise situation at that QTH. If
you are external noise limited then you may not see much of a difference.
:-)

An i7-class PC can run two instances of CW Skimmer on two separate Red
Pitaya SDRs without breaking a sweat. But adding RTTY in there will cause
the CPU to be saturated during RTTY contests - but should be OK in
non-contest times.

Hope this helps.

73,
Dave KM3T


On Thu, Nov 23, 2017 at 7:08 AM, Paul <gw8izr at gmail.com> wrote:

> Hello Stefan,
>
> I would also very interested to see noise performance of the Pitaya board,
> I’m not convinced that this is a receiver intended for crowded bands.
> Whilst there may be some rudimentary comparison made between the receivers,
> that hasn’t been suitable in depth measurement (not that I’ve seen anyway)
>
> Personally I don’t see it as being a suitable replacement for QS1r or
> Perseus etc
>
> 73 de Paul GW8IZR
>
>
>
> > On 23 Nov 2017, at 10:54, Stefan von Baltz, DL1IAO <
> dl1iao at contesting.com> wrote:
> >
> > Hello all,
> >
> > In theory the 125-14 with its 14 bit ADC should be superior to detect
> weak signals on a busy band due to its higher dynamic range. Has anyone
> actually compared the two different Pitayas? Which Pitaya are you using?
> JF2IWL has shown that a 125-10 compares well to a QS1R and S9-C.
> >
> > I see that you can run CwSkimmer and RttySkimmer with one Pitaya and one
> PC. But does anyone run 2 Pitayas on one PC with 2 instances of CwSkimmer
> or even 2 instances each of CwSkimmer and RttySkimmer? This would require a
> powerful PC, though.
> >
> > Thanks in advance!
> >
> > 73,
> >
> > Stefan DL1IAO, SA3CWW/SM9A
> >
> >
> > --
> > Stefan v. Baltz
> > DL1IAO at contesting.com
> > http://www.dl1iao.com
> >
> > Sent from my iPhone
> >
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