mirror of https://github.com/saitohirga/WSJT-X.git
151 lines
7.5 KiB
Plaintext
151 lines
7.5 KiB
Plaintext
Changes in WSJT 5.9.0 -- November 15, 2005
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1. JT65 decoding has been made faster and significantly improved in
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other ways. Three new options appear on the Decode->JT65 menu:
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"Fast", "Normal", and "Exhaustive". The program is most sensitive
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if you choose "Exhaustive". Choosing "Normal" will make decoding
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slightly less sensitive, but the loss is not great, and decoding
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can be twice as fast. The "Fast" setting is faster still, but can
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be less sensitive by 2 dB or more in some cases. If you have a 1.5
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GHz or faster computer, use "Exhaustive". With a slower computer
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you may want to experiment with the other settings.
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2. In JT65 mode, double-clicking on the waterfall (SpecJT window) or
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on the red curve (main window) will set "Freeze DF" at the selected
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frequency, turn Freeze ON, and invoke the decoder. Using this
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feature, you can quickly decode a transmission at several different
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values of DF. I find this feature to be *extremely* useful.
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3. The range of DT values searched to establish synchronization has
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been doubled, now extending from -2 to +10 seconds. The reported
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values of DT are more accurate, as well. You should normally
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expect EME signals to have DT in the range 2 to 3 seconds, but the
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program will now synchronize properly even if DT is well outside
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this range.
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4. WSJT now offers the ability to correct for errors in soundcard
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input and output sampling rates. Numbers displayed in the first
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panel of the status bar (at lower left of the main screen) give the
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ratio of actual sample rates for input and output to the correct
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value, 11025 Hz. The numbers should stabilize about one minute
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after program startup. If they fall in a "safe" range between
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about 0.9990 and 1.0010, you have a good sound card (at least in
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respect to sampling frequency). You can then leave the entry
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fields "Rate In" and "Rate Out" on the "Setup -> Options" page at
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their default values, 1.0.
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If your soundcard gives one or both numbers well outside the safe
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range, you should enter the displayed errant numbers as "Rate In"
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and/or "Rate Out" on the Setup->Options page. This needs to be
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done only once; subsequent changes in the last decimal place of the
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displayed values are not very significant, and can be safely
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ignored.
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The result of this procedure is that your Tx signal will be
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"trimmed" so that your tone spacings in time and frequency are
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correct. In addition, your digitized Rx signals will be adjusted
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so that the software can properly interpret them.
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This is an important procedure. Some recent sound cards produce
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sampling error factors as low as 0.9932 or as high as 1.0068. If
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uncorrected, such results can degrade your S/N in WSJT modes by 2
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dB or more.
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If one of the measured sample rates differs from the corresponding
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value specified for "Rate In" or "Rate Out" by more than 0.1%, a
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red warning label will appear just below the graphical area on the
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main screen.
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5. Graphical display of information obtained during JT65 decoding has
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been enhanced. As before, a red line illustrates the maximum
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correlation between the pseudo-random sync tone pattern and the
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received signal at each value of frequency offset, DF. A blue line
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shows the correlation at the best DF, plotted as a function of time
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offset, DT. If a shorthand message is detected, two new lines
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colored magenta and orange replace the red and blue lines. The new
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lines illustrate phase-resolved spectra measured in each of the two
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phases of the shorthand square-wave pattern. A properly detected
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shorthand message will show a peak in the magenta curve, followed
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at a specified distance by a peak in the orange curve. The correct
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locations of the two peaks are marked by small yellow ticks.
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Unlike the alternating shorthand message tones, birdies will appear
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approximately equally in the magenta and orange curves.
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6. For the convenience of temporary DXpeditions, a new JT65 feature
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permits use of add-on DXCC prefixes that are not in the published
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list of supported prefixes. Both stations in a QSO must enter the
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required prefix (for example, PJ8 or FS) in a box on the
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Setup->Options page. The effect will be to temporarily add the
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entry to the table of supported prefixes.
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7. The Setup->Options page has new entry fields labeled "Source RA"
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and "Source DEC". You can enter the current right ascension and
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declination of a radio source to be used for system calibration, or
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perhaps a pulsar or a deep space probe that you wish to detect.
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The program will display (on the Astronomical Data screen) the
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current Azimuth and Elevation of the specified object at your
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station. The source Azimuth and Elevation are also written every
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second to the file azel.dat, in case you have automated tracking
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capabilities that depend on this information.
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8. To facilitate the coming release of the full source code of WSJT
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under the General Public License, the proprietary soft-decision
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Reed Solomon decoder has been removed from WSJT proper and made
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into a separate executable module. This change is invisible to the
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user, and the full benefit of the soft-decision decoder is still
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available. An open source hard-decision decoder is also provided;
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it's what you get when you select the "Fast" JT65 decoding option.
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9. In WSJT 5.8.6, if the value of "Freeze DF" (as displayed in the
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Status Bar) differs from the sync tone frequency by more than
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"Tol", shorthand decoding was suppressed even if Freeze was not
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checked. This is a bug, and it has been fixed.
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10. Earlier versions of WSJT also had a bug that could cause the "Zap"
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function to notch out a valid sync tone. Fixed.
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11. The Help screens called up by F1 and Shift-F1 have been updated.
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Be sure to read these screens: they contain many operational
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conveniences that you may not have discovered!
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12. At scrolling speed 5, the time labels and "minute separator" lines
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were displayed erratically and the CPU load was excessive. Fixed.
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13. Signal strength measurements above -20 dB were formerly compressed
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and significantly underestimated. This has been fixed.
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14. Decodings of the average of many properly synchronized transmissions
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would sometimes go from "good" to "bad" after approximately 8-12
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transmissions. This was a bug, and it has been fixed.
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15. Several bugs in the FSK441 decoder have been fixed. Both automatic
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decoding and mouse-picked decoding have been improved.
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16. Changing WSJT modes now sets Auto to OFF, Tol to 400, and the Tx
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message number to 1.
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17. The generated audio tones for CW ID in FSK441 and JT6M modes have
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been moved down to 440 Hz, to avoid possible confusion with the
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other tones used in these modes.
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18. Readout of "Rx noise" on the main screen is now highlighted in red
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if the level is outside the range -10 to +10 dB.
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19. The Monitor button is no longer highlighted in green while you are
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transmitting.
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20. No attempt is made to decode if the Rx level is very low -- for
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example, if your receiver is turned off.
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21. If the Grid box does not contain a valid locator, readouts of
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azimuth and distance are suppressed.
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22. Keying of the audio tone to produce Morse code has been "softened"
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to suppress key clicks.
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23. Your transmitted messages recorded in the file ALL.TXT are now
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identified as to mode, and shorthand transmissions are noted.
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23. A number of other very minor bugs have been fixed.
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