[Skimmertalk] RP10 14 and 16

[Dai NAGAKURA]

Pete, My conclusion from price consideration is that  
RP-10 is suitable for Skimmer beginner , student and 
fill in Skimmer gap in the world.

In FT8 age , My RTTY skimmer is resting 93% this year,
so, I run it only weekend.

===
Typo correction

(1) Red Pitaya 10bit 
Imput inpedance is 1k ohm and only one imput , needs 14:1 transformer 
6 band Skimmer
Price = 240USD.  price/band  ratio is 40USD

(2) Red Pitaya 14bit 
Imput inpedance is 1k ohm and only one imput, needs 14:1 transformer 
8 band Skimmer
Price = 300USD.  price/band  ratio is 37.5USD

(3) Red Pitaya 16bit 
Imput inpedance is 50 ohm ,two imput.
8+8=16 band Skimmer
Price = 500USD.  price/band  ratio is 31.2USD

Dai / JF2IWL



On Tue, 25 Jun 2019 08:01:16 -0400
N4ZR <n4zr at comcast.net> wrote:

> It's an interesting analysis, Dai.? If you wanted to? run Skimmers on 16 
> bands at a time, then the 8+8 configuration of the 16-bit RP SDR by 
> Pavel Demin, plus the 16-bit resolution of its ADC, would make it a very 
> good value.? It's a little academic, unfortunately, at the current state 
> of the ionosphere.
> 
> I may have missed this in the recent discussion, because I'm not 
> currently running CWSL, but I wonder if anyone has run two simultaneous 
> instances of CW or RTTY Skimserv (or one of each) on the 2 outputs of 
> the RP-16?
> 
> 73, Pete N4ZR
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
> 
> On 6/25/2019 4:46 AM, Dai NAGAKURA wrote:
> > de JF2IWL
> >
> > Are there someone answer my elementary but fundamental question
> > about RP's ADC bit number ?
> >
> > (1) Red Pitaya 10bit
> > Imput inpedance is 1k ohm and only one imput , needs 14:1 transformer
> > 6 band Skimmer
> > Price = 240USD.  price/band  raito is 40USD
> >
> > (2) Red Pitaya 10bit
> > Imput inpedance is 1k ohm and only one imput, needs 14:1 transformer
> > 8 band Skimmer
> > Price = 300USD.  price/band  raito is 37.5USD
> >
> > (3) Red Pitaya 10bit
> > Imput inpedance is 50 ohm ,two imput.
> > 8+8 16 band Skimmer
> > Price = 500USD.  price/band  raito is 31.2USD
> >
> > At this time, RP-16 is most cheap ber band
> > then put  ADC bit and price coefficient= 1/ADC bit number,
> > and multiply above,
> >
> > Result are
> >
> > RP-10 =40USD/band/10=4.0USD
> > RP-14 =37.5USD/band/14=2.7USD
> > RP-16=31.2USD/band/16=2.0USD
> >
> > So, RP-16 is most cheap and Highiest performance board.
> >
> > Is it right?
> >
> > Dai / JF2IWL
> >
> >
> >
> >
> >
> >
> _______________________________________________
> Skimmertalk mailing list
> Skimmertalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/skimmertalk

-- 
Dai NAGAKURA <ndai at cameo.plala.or.jp>


On Tue, 25 Jun 2019 08:01:16 -0400
N4ZR <n4zr at comcast.net> wrote:

> It's an interesting analysis, Dai.? If you wanted to? run Skimmers on 16 
> bands at a time, then the 8+8 configuration of the 16-bit RP SDR by 
> Pavel Demin, plus the 16-bit resolution of its ADC, would make it a very 
> good value.? It's a little academic, unfortunately, at the current state 
> of the ionosphere.
> 
> I may have missed this in the recent discussion, because I'm not 
> currently running CWSL, but I wonder if anyone has run two simultaneous 
> instances of CW or RTTY Skimserv (or one of each) on the 2 outputs of 
> the RP-16?
> 
> 73, Pete N4ZR
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
> 
> On 6/25/2019 4:46 AM, Dai NAGAKURA wrote:
> > de JF2IWL
> >
> > Are there someone answer my elementary but fundamental question
> > about RP's ADC bit number ?
> >
> > (1) Red Pitaya 10bit
> > Imput inpedance is 1k ohm and only one imput , needs 14:1 transformer
> > 6 band Skimmer
> > Price = 240USD.  price/band  raito is 40USD
> >
> > (2) Red Pitaya 10bit
> > Imput inpedance is 1k ohm and only one imput, needs 14:1 transformer
> > 8 band Skimmer
> > Price = 300USD.  price/band  raito is 37.5USD
> >
> > (3) Red Pitaya 10bit
> > Imput inpedance is 50 ohm ,two imput.
> > 8+8 16 band Skimmer
> > Price = 500USD.  price/band  raito is 31.2USD
> >
> > At this time, RP-16 is most cheap ber band
> > then put  ADC bit and price coefficient= 1/ADC bit number,
> > and multiply above,
> >
> > Result are
> >
> > RP-10 =40USD/band/10=4.0USD
> > RP-14 =37.5USD/band/14=2.7USD
> > RP-16=31.2USD/band/16=2.0USD
> >
> > So, RP-16 is most cheap and Highiest performance board.
> >
> > Is it right?
> >
> > Dai / JF2IWL
> >
> >
> >
> >
> >
> >
> _______________________________________________
> Skimmertalk mailing list
> Skimmertalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/skimmertalk

-- 
Dai NAGAKURA <ndai at cameo.plala.or.jp>