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
Storm Emergency Traffic IARU HF Championship Contesters: The Hurricane Watch Net (HWN) is active on 14.325 MHz and 7.268 MHz in response to Category 1 Hurricane Barry. WX4NHC at the National Hurricane Center has activated and plans to opera... Read more
VHF
To fully utilize all the features you have to use Windows PC to program this radio. Not Compatible with CHIRP and RT systems software. FCC Part 90 Certified, FCC ID: T4KD878UV New Features on AT-D878UV GPS version Roaming (Auto/Manual) Re... Read more
Antenna
“Chameleon Antennas recently updated their Modular Portable Antenna System or MPAS with the goal of it being the most versatile, high performance, and rugged HF antenna system on the market. I think they’ve certainly hit that mark wit... Read more
Review
3. LDMOS HF AMPLIFIER 100W INPUT 2400W OUTPUT BLF188XR 2 PCS 1.8-54 MHZ
LDMOS HF amplifier 90W input 2400W CW SSB output 1.8-54 MHz This a ready power amplifier. You will need a case and power supply only! Water-cooled h... Read more
2 Meter Band Explorations
“This band-exploration video looks at the amateur 2 meter band. We walk through the band. I talk about frequency coordination and band plans. I... Read more
Anytone D878UV+ Handheld Radio
Anytone D878UV Read more
IC-9700 Test Report by Adam VA7OJ/AB4OJ
Source:http://www.ab4oj.com/ Read more