[Skimmertalk] RP10 14 and 16

[N4ZR]

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
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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
>
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