George is quite right!
Leave it to the dev team -and to Igor!
It well worth to test what does JTDX dev team do.
gl de ha6nn
Andras
On Wed, Aug 8, 2018 at 1:10 PM, George J Molnar <geo...@molnar.com> wrote:
> I think he is lamenting the “loss of sensitivity” with FT8 compared to
> JT65 now that the former has come to dominate. Not sure his math works out,
> so will leave that to the dev team. Imagine they are keenly interested in
> performance, too.
>
> George J Molnar
> Virginia, USA
>
>
> > On Aug 8, 2018, at 8:04 AM, Neil Zampella <ne...@techie.com> wrote:
> >
> > Frankly, I don't see where you're getting the idea that JT65
> sensitivity is missing?
> >
> > It is still much more sensitive than FT8, and will be for the
> foreseeable future, as are the other WSJT-X modes. JT9A is at -27, JT65A
> is at -25, and QRA64A is at -26. FT8 is -21 .. all this is based on a
> average noise floor.
> >
> > I don't see what your 'new mode' is going to accomplish.
> >
> > Neil, KN3ILZ
> >
> >
> >> On 8/8/2018 2:29 AM, Игорь Ч wrote:
> >> Hello Joe and all,
> >> .
> >> We all have been missing JT65 mode sensitivity and proposed WSJT-X 2.0
> new FT8 approach with 0.2 dB sensitivity penalty can make things even worse.
> >> .
> >> I would like to ask you to consider a new protocol where callsign hash
> would be used instead of the real callsign in all messages but CQ and
> incoming call, this way we can get back to -25..26dB SNR sensitivity
> although will get more limited with the free message length.
> >> .
> >> CQ message: 28 bit callsign1 + i5bit + 12 bit CRC = 45 bit
> >> incoming call: 10 bit call1 hash + 28 bit callsign2 + i5bit + 12bit CRC
> = 55 bit
> >> report message: 10 bit call2 hash + 10 bit call1 hash + i5bit + (10 bit
> call3 hash for DXpedition) + 6 bit report + 12 bit CRC = 43(53) bit
> >> roger+report message: 10 bit call1 hash + 10 bit call2 hash + 6 bit
> report+ i5bit + 12bit CRC = 43 bit
> >> 73 message: 10 bit call2 hash + 10 bit call1 hash + 15 bit GRID +
> i5bit + 12bit CRC = 55 bit
> >> RR73 message: 10 bit call1 hash + 10 bit call2 hash + 15 bit GRID +
> i5bit + 12bit CRC= 52 bit
> >> .
> >> Spare bits can be used for nonstandard(special) callsign transmission
> in CQ message. call1 hash could be omitted in the incoming call message if
> this message is originated by the nonstandard(special) callsign.
> >> .
> >> Probably we can optimize protocol even better while a main idea is to
> transmit a full callsign only once per each QSO and to transmit not more
> than one full callsign in the message.
> >> .
> >> 73 Igor UA3DJY
> >
> >
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