Breve guida su come impostare il software WSJT-X 1.8 per i modi digitali FT8, JT9 e JT65. La versione che attualmente permette di operare in FT8 è ancora in fase “beta”.Io uso la versione per piattaforma Mac, non riscontrando nessun problema.

WSJT-X ott 08 14.22.46

Nuove funzionalità WSJT-X 1.8

1. New mode called FT8: sensitivity down to -20 dB on the AWGN
channel; QSOs 4 times faster than JT65 or JT9; auto-sequencing
includes an option to respond automatically to first decoded
reply to your CQ.

2. New mode for accurate Frequency Calibration of your radio.

3. Improved performance of decoders for JT65, QRA64, and MSK144.
MSK144 includes facilities for amplitide and phase equalization
and an “SWL” mode for short-format messages.

4. Options to minimize screen space used by Main and Wide Graph
windows.

5. Enhanced management scheme for table of operating frequencies, and
a new set of default frequencies specific to the three IARU
Regions.

6. Improved CAT control for many rigs, including those controlled
through Commander or OmniRig.

7. New keyboard shortcuts to set “Tx even/1st” ON or OFF.

8. A number of (mostly minor) bug fixes and tweaks to the user
interface. For example: new behavior for the audio level slider;
correctly logged QSO start times in certain situations; correct
control of FT-891/991 and some other radios via rigctld

 

Caratteristiche modo digitale FT8

– T/R sequence length: 15 s
– Message length: 75 bits + 12-bit CRC
– FEC code: LDPC(174,87)
– Modulation: 8-FSK, tone spacing 6.25 Hz
– Constant-envelope waveform
– Occupied bandwidth: 50 Hz
– Synchronization: 7×7 Costas arrays at start, middle, and end
– Transmission duration: 79*1920/12000 = 12.64 s
– Decoding threshold: -20 dB; several dB lower with AP decoding
– Multi-decoder finds and decodes all FT8 signals in passband
– Optional auto-sequencing and auto-reply to a CQ response
– Operational behavior similar to JT9, JT65

 

Impostazione WSJT-X 1.8 per IcomIc 7300

Radio

Schermata 2017-02-25 alle 09.14.17

Audio

WSJT-X Setting Audio

Impostazione Icom IC 7300 menù Connessione

Entrare nel menù Connectors
Impostare come segue :

2.20171008_123226

3.20171008_123236

4.20171008_123244

1.20171008_123201

Impostare la radio in modalità USB-D
Potenza 7% per avere un uscita di circa 5Watt, verificare sempre !!

Link con la guida completa

Guida

Impostazione WSJT-X con Icom Ic7300 per modo digitale FT8 e JT65
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