[Skimmertalk] [RBN-OPS] Red Pitaya modifications

[Björn Ekelund]

Thanks Bob,

They claim the new RP will fit "existing cases" but it seems the
prototype 122.88-16 does not have rounded shape of the 125-14.

It also struck me that if you want to operate more than one RP from
the same antenna (e.g. RTTY, CW and FT8 skimmers), the
high impedance version is more convenient since you can basically
connect them all in parallel behind the transformer.
With a 50 ohm input, it gets more complex and you need a proper splitter.

73,

Björn SM7IUN


Den sön 27 jan. 2019 kl 19:32 skrev Bob Wilson, N6TV <n6tv at arrl.net>:
>
> This is the link to new SDR:
>
> https://www.redpitaya.com/n86/new-stemlab-sdr
>
> which they are calling the STEMlab 122.88-16 SDR (a very hard name to
> remember).
>
> I wrote directly to the CEO of the Red Pitaya company who had previously
> helped me purchase all of the RP impedance transformers
> <https://www.kkn.net/~n6tv/XFMR> that I redistributed to many folks on this
> list.  Unfortunately, he no longer works for the company.  :-(  I don't
> know the name of the new CEO.  I was given the name of a Sales manager, but
> he has not responded to any of my emails yet.
>
> We also have to understand that Pavel Demin's SDR software will need some
> modifications to work on this new board, and it may cost a lot more than
> the old one, since it could be a low-volume item compared to their prior
> products.
>
> FYI, the old metal case won't work with the new board, because the new
> board doesn't appear to have a rounded edge at the front.  The old acrylic
> case may work OK.
>
> In sum, if you're in a hurry to put a multi-band SDR on the RBN *now*, buy
> the current Red Pitaya board and a transformer or two.  It could be a long
> time before the new Red Pitaya SDR comes out, and it could take a while
> after that before the new software and hardware becomes as stable and
> reliable as the current implementation.
>
> 73,
> Bob, N6TV
>
> On Sun, Jan 27, 2019 at 3:48 AM David Robbins <k1ttt at arrl.net> wrote:
>
> > I thought this new red pitaya was going to be designed for 50 ohm
> > inputs???  Looks like they are including the transformer in the basic rx
> > only kit.
> > https://www.redpitaya.com/Catalog/p25/stemlab-125-14-sdr-kit?cat=c102
> >
> >
> > David Robbins K1TTT
> > e-mail: mailto:k1ttt at arrl.net
> > web: http://wiki.k1ttt.net
> > AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
> >
> >
> >
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