Hello Tsutsumi san and All,
.
Limitation is coming from sound card sampling rate:
.
48kHz -> 20kHz
96kHz -> 40kHz
192kHz -> 80kHz bandwidth.
.
We getting a bit less than 50% bandwidth of reliable data after the Fast
Fourier transform.
.
73 Igor
.
>Re: [wsjt-devel] JT65 HF bands capacity, spectra allocation, and software
>support
>From: Takehiko Tsutsumi <take.tsutsumi@gm...> - 2017-02-23 12:19:36
>Attachments: Message as HTML
>
>Joe,
>
>Thank you for your quick response.
>
>I understood your basic approach.
>
>However, I have an impression that your indicated bandwidth 20kHz at initial
>stage and 80kHz as goal are humble and modest. This limitation would come from
>not only JT software but also come from RF receiver hardware. As you said you
>will assume it is SDR architecture, then, it can realize 48kHz with low-tier
>soundmodem based SDR such as SoftRock. If it is DUC/DDC type, 192kHz is a
>piece of cake to realize.
>
>If the bandwidth is 192KHz, it covers entire CW and RTTY chunk up to 12m band
>and we can negotiate incumbent at strong position from the beginning.
>
>Would you explain the reason why you pick up 20KHz number?
>
>Regards,
>
>take
>
>de JA5AEA
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