[Skimmertalk] Difference of RP10 14 16

[Bob Wilson, N6TV]

For RP-10 I think you use the "official" OS, Ubuntu, not Alpine Linux.  The
you open a web browser and enter the IP Address of the Red Pitaya, and it
should open a page with a link to Application Marketplace that looks like
this:   http://bazaar.redpitaya.com/ .  You can install / update the SDR
Receiver HPSDR.

More details here:
http://hamsci.org/n6tv-red-pitaya-combine-cw-rtty-skimmer-hdsdr

It looks like the RP-10 and RP-14 can run the same Ubuntu OS.  Instructions
to make a new image here:

https://redpitaya.readthedocs.io/en/latest/quickStart/SDcard/SDcard.html

73,
Bob, N6TV


On Mon, Jul 15, 2019 at 9:21 PM Dai NAGAKURA <ndai at cameo.plala.or.jp> wrote:

>
> Thank you Bob
>
> Well RP-10 shall handle 8 bands,
> but I could not find nor understand new OS and commands.
> Would you tell where hidden gem and spell is ?
>
> >A preamp could make the problem worse.
>
> This is delicate issue.
> At this point , We are expecting furtheｒ study.
>
> Thank you
> Dai JF2IWL
>
>
>
>
>
> On Mon, 15 Jul 2019 20:46:33 -0700
> "Bob Wilson, N6TV" <n6tv at arrl.net> wrote:
>
> > On Mon, Jul 15, 2019 at 8:09 PM Dai NAGAKURA <ndai at cameo.plala.or.jp>
> wrote:
> >
> > > I have tested RP-10 and 14 , five weekdays and IARU HF 24 hours.
> > >
> >
> > Thank you.
> >
> >
> > > To write a brief paper, I would like to know two point below.
> > >
> > > (1) RP-10 could run only 6 bands at the same time
> > > RP-14=8 bands , RP-16=8x2=16 bands . is it right ?
> > >
> >
> > I'm not sure about the RP-10, I thought it was also 8 bands.  RP-14 is
> > definitely 8 bands, and RP-16 = 8x2 = 16, correct.
> >
> >
> > > (2) RP-10 and RP-14 need step down transformer and pre-amp Instead,
> RP-16
> > > need NOT Both.
> > >
> >
> > Yes, RP-10 and RP-14 both need to have 14:1 impedance transformers (and
> > shunt jumpers moved on both inputs), and they need about a 10 dB preamp.
> >
> > I am not sure if the RP-16 needs a preamp.  Maybe only on one antenna
> > input, just for the high bands.  But it is easily overloaded (intermod)
> by
> > nearby FM broadcast stations between 88 and 108 Mhz, and needs a lowpass
> > filter.  A preamp could make the problem worse.
> >
> > 73,
> > Bob, N6TV
>
> --
> Dai NAGAKURA <ndai at cameo.plala.or.jp>
>
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