FT8/FT4/FST4WJT9: WSJT 2-Way Narrow Modes For Amateur Radio está no Facebook. Para se conectar com FT8/FT4/FST4WJT9: WSJT 2-Way Narrow Modes For Amateur Radio, entre ou crie uma conta.
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FT8/FT4/FST4WJT9: WSJT 2-Way Narrow Modes For Amateur Radio

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Welcome! Joe Taylor, K1JT, announced on June 29, 2017 the availability of a new mode in the WSJT-X software called FT8. The mode was developed by K1JT and Steve, K9AN. FT8 stands for "Franke-Taylor design,Mais 8-FSK modulation" and is described as being designed for "multi-hop Es where signals may be weak and fading, openings may be short, and you want fast completion of reliable, confirmable QSO's. On April 22, Joe Taylor announced a new upcoming mode known as FT4. More details will be provided as they become available.

The mode is described by K1JT as follows:

Important characteristics of FT8:

- T/R sequence length: 15 s
- Message length: 77 bits (up from 75 in prior versions) + 12-bit CRC
- FEC code: LDPC(174,87)
- Modulation: 8-FSK, keying rate = tone spacing = 5.86 Hz
- Waveform: Continuous phase, constant envelope
- Occupied bandwidth: 47 Hz (later refined to 50 Hz)
- Synchronization: three 7x7 Costas arrays (start, middle, end of Tx)
- Transmission duration: 79*2048/12000 = 13.48 s (note some refinements have been made since the original description and the duration is now 12.64 seconds)
- Decoding threshold: -20 dB (perhaps -24 dB with AP decoding, TBD)
- Operational behavior: similar to HF usage of JT9, JT65
- Multi-decoder: finds and decodes all FT8 signals in passband
- Auto-sequencing after manual start of QSO

*Comparison with slow modes JT9, JT65, QRA64:* FT8 is a few dB less sensitive but allows completion of QSOs four times faster. Bandwidth is greater than JT9, but about 1/4 of JT65A and less than 1/2 QRA64.

*Comparison with fast modes JT9E-H:* FT8 is significantly more sensitive, has much smaller bandwidth, uses the vertical waterfall, and offers multi-decoding over the full displayed passband.

*Still to come, not yet implemented:* We plan to implement signal subtraction, two-pass decoding, and use of "a priori" (already known) information as it accumulates during a QSO. (note that since the original release, a significant portion of this has since been implemented)


***
In addition, a new mode “FT4” is in development. More details on this can be found in the announcements section
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Tom Hauer, profile picture

New one here in my shack. Only thing running is WSJT-X connected to my FT2000. I am just letting it listen, in fact here I let it run over night. No other rigs transmitting. WSJT-X is still decoding normallyMais but has lost rig control. It does this randomly, and frequently. Only way to recover is to reboot the computer, nothing else will recover it. Don't have to reboot the rig, just the computer. WSJT-X V2.2.2. Any ideas? K0YA

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Rex Weatherford, profile picture

Rex Weatherford compartilhou um link.

1 h
Assuming everything goes on the truck in the morning.......


KE0MHJ/R Jan VHF Contest Limited Rover

6m, 2m, 70cm

Follow me on APRS at KE0MHJ-5

Saturday EM39, EM38, EM28, EM29, EN20, EN30.
Mais
Sunday EM39, EM49, EN30, EN40

Check QRZ.com for a few details.

Thanks for the contacts, lets hope for an opening in EN20.

APRS.FI

Google Maps APRS

Bert Nts, profile picture

Bert Nts compartilhou um link.

10 h

Hello its possible add sim31 mode in this group ?

F5NTS.PAGESPERSO-ORANGE.FR

sim psk

Ce Mode permettant d'améliorer considérablement la qualité de transmission tout en ayant une vitesse de transmission identique voir meilleurs dans certains cas. . il garde la possibilité de faire des QSO en mode PSK31 ou PSK63
Fred Price, profile picture

Once again it is time to remind members of one of our rules, it's that we ask members not to ADD or INVITE others. We have had complaints, and have been reported to Facebook, by people who have been added and wonder why they are getting a notice from the group. They think its SPAM or SPOOF, and this creates issues.

If you'd like to add orMais invite people, tell them about the group, and let them make their own decisions. They will need to answer the mandatory group questions just like everyone else, but they'll be doing it voluntarily.

Please follow this rule, we don't need the 'added' headaches.

Pun intended.

Fred Price, profile picture

Fred Price compartilhou um link.

19 h

This is a reminder for those who are going to participate in the ARRL January VHF contest this weekend.
Make sure you are using the NA VHF Contest mode. To set this up
File>Settings>Advanced tab put a check inMais Special operating activity and then check NA VHF Contest, then click ok. The report is grid square and not a SNR. This is no matter if using FT8, FT4, or MSK144.
Information about the contest can be found here

ARRL.ORG

January VHF

The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources.