Re: FT8 and power levels


Rubens Kamimura
 

Olá Evan, Curt e grupo.

O meu uBitx v4, voltou a oscilar no 40m, 7074kHz em FT8, mesmo com "fake It" selecionado no JTDX. E observo a falta de potência de RF de saída na faixa dos 10 a 15m.

Em qua, 20 de jan de 2021 13:11, Rafael Diniz <rafael@...> escreveu:

Thanks Evan!

On 1/20/21 7:41 AM, Evan Hand wrote:
> On Tue, Jan 19, 2021 at 07:28 PM, Rafael Diniz wrote:
>
>     What is the emission type / signal characteristics of this "FT8"?
>
> *FT8* messages are transmitted using 8-tone continuous-phase frequency
> shift keying (CPFSK). Each transmitted tone or channel symbol conveys
> three bits.
>
> from 
> https://physics.princeton.edu/pulsar/k1jt/FT4_FT8_QEX.pdf
> <https://physics.princeton.edu/pulsar/k1jt/FT4_FT8_QEX.pdf>
>
> 73
> Evan
> AC9TU
>






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