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ffdeafe3bb
This change introduces the program jt9_omp which is a testbed for a multi-threaded version of the jt9 decoder program. The program jt9_omp should be a directly substitutable for jt9 except that JT65 and JT9 decodes are computed in parallel. Also enable the OpenMP directives in decoder.f90 - note this is not yet a working multi-threaded decoder and the existing jt9 is still the correct decoder to be used in WSJT-X. Increased the available stack size for jt9_omp.exe as this is a hard limit on Windows and the default is not big enough for the OpenMP version of jt9. Also Fortran array bounds checking is now disabled for Release configuration builds so as to improve performance a little. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@4922 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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Copyright (C) 2001 - 2014 by Joe Taylor, K1JT.
WSJT-X implements JT9, a new mode designed especially for the LF, MF,
and HF bands, as well as the popular mode JT65. Both modes were
designed for making reliable, confirmed QSOs under extreme weak-signal
conditions. They use nearly identical message structure and source
encoding. JT65 was designed for EME (“moonbounce”) on the VHF/UHF
bands and has also proved very effective for worldwide QRP
communication at HF; in contrast, JT9 is optimized for HF and lower
frequencies. JT9 is about 2 dB more sensitive than JT65A while using
less than 10% of the bandwidth. World-wide QSOs are possible with
power levels of a few watts and compromise antennas. A 2 kHz slice of
spectrum is essentially full when occupied by ten JT65 signals. As
many as 100 JT9 signals can fit into the same space, without overlap.
WSJT-X offers a “bi-lingual” operating mode in which you can transmit
and receive JT65 and JT9 signals, switching between modes
automatically as needed. Displayed bandwidth can be as large as 5
kHz. If your receiver has as upper-sideband filter at least 4 kHz
wide, you can have all the typical JT65 and JT9 activity on screen at
once, available for making QSOs with a click of the mouse. Even with
standard SSB-width IF filters, switching between JT65 and JT9 modes is
quick and convenient. Be sure to read the online WSJT-X User's Guide.
Project web site:
http://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html
Project mailing list (shared with other applications from the same
team):
https://groups.yahoo.com/neo/groups/wsjtgroup