Release: WSJT-X Version 1.8.0

WSJT-X Version 1.8.0

” 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.

At the time of the v1.8.0-rc1 release the following tasks are yet to
be completed:

1. Updates to WSJT-X User Guide.
2. Sample files for FT8.
3. Enhanced decoding using AP (“a priori”) information.
4. Signal subtraction and multi-pass decoding.
5. Option to Auto-respond to the weakest responder to your CQ.

Installation packages for Windows, Linux, OS X, and Raspbian can be
downloaded from the WSJT web site:
http://physics.princeton.edu/pulsar/K1JT/wsjtx.html

Please send bug reports to either wsjtgroup@yahoogroups.com or
wsjt-devel@lists.sourceforge.net. Such reports should include a full
prescription of steps to reproduce the undesired behavior. You must
be a subscriber to post to either of these lists.

Brief Description of the FT8 Protocol
————————————-

WSJT-X Version 1.8.0 includes a new mode called FT8, developed by K9AN
and K1JT. The mode name “FT8” stands for “Franke and Taylor, 8-FSK
modulation”. FT8 uses 15-second T/R sequences and provides 50% or
better decoding probability down to -20 dB on an AWGN channel. An
auto-sequencing facility includes an option to respond automatically
to the first decoded reply to your CQ. FT8 QSOs are 4 times faster
than those made with JT65 or JT9. FT8 is an excellent mode for HF
DXing and for situations like multi-hop E_s on 6 meters, where deep
QSB may make fast and reliable completion of QSOs desirable.

Some important characteristics of 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

We plan to implement signal subtraction, two-pass decoding, and use of
a priori (AP) information in the decoder. These features are not yet
activated in v1.8.0.

We haven’t yet finalized what the three extra bits in the message
payload will be used for. Suggestions are welcome!

— Joe, K1JT, for the WSJT Development Team”

News

ESEO satellite commissioning starts

March 23, 2019 in: News No comments

On Monday, December 3, 2018, the 50 kg ESA Education Office satellite ESEO was launched by Space-X on the Spaceflight SSO-A SmallSat Express mission. Following the launch from Space Launch Complex 4E (SLC-4E) at Vandenberg Air Force Base, E... Read more

Ohio ARES Provides “Situational Awareness” During January Blizzard

March 21, 2019 No comments
IARU Represents Amateur Radio at WRC-19 Preparatory Meeting

March 21, 2019 No comments
Canadian Amateur Radio Interference Case Adjudicated

March 20, 2019 No comments
FCC Cites Amateur Service Rule Violations in Unlicensed Broadcasting Case

March 20, 2019 No comments

VHF

IC-9700 Manual – Basic and Advanced Manual [ English ]

March 23, 2019 in: VHF No comments

IC-9700 Manual Basic Manual http://www.icom.co.jp/world/support/download/manual/pdf/IC-9700_ENG_Basic_0.pdf Advanced Manual: http://www.icom.co.jp/world/support/download/manual/pdf/IC-9700_AdvancedManual_ENG_0.pdf Read more

Alinco DJ-MD5 Dual Band DMR HT Radio

March 12, 2019 No comments
Retevis RT90 Mobile Dual Band DMR Mobile Radio Review – Part 1

February 23, 2019 No comments
Es’hailSat 2 portable reception

February 13, 2019 No comments
Student from Saint Paul’s School Rajkot receives ISS SSTV

February 12, 2019 No comments

Antenna

BIG SIGNAL DX-Quad – 5 Bands!

March 12, 2019 in: Antenna No comments

Discover the BIG SIGNAL DX-Quad antenna , this new design of a single element Multi-Band Quad covers up to 5 bands in HF from 10 to 20 meters. An incredible high-performance bi-directional antenna option to get started on the DX in HF witho... Read more