I'd just leave it to the WSJT-X team, and only the WSJT-X team.
Neil, KN3ILZ
On 8/9/2018 4:08 PM, Andras Bato wrote:
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
<mailto: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
<mailto: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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