[Skimmertalk] Difference of RP10 14 16

[Björn Ekelund]

The only difference between the RP-10 and RP-14 is the data converter, they
both use the Xilinx Zynq 7010 FPGA device.
So they should run the same OS and software and have the same capacity in
terms of bands.
The radio performance is however different.

I think whether or not the RP-16 needs a preamp depends on antenna
efficiency. With my simple multi-band
dipole, listening to the RP-16 via PowerSDR, I can not hear any increase in
band noise on 12m (and higher)
when I connect the antenna. This suggests it would benefit from some extra
front end gain. However, listening to
the spots I get on those higher bands with my main radio, performance seems
acceptable. The RP only fails to
decode the really weak stations.

73,

Björn SM7IUN


Den tis 16 juli 2019 kl 06:56 skrev Bob Wilson, N6TV <n6tv at arrl.net>:

> 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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