JTDX v17.7 release notes.

Source code is modified with contributions from Arvo ES1JA, Richard G7OED, David MM0HVU, 
Vitaly UA3ALE, Oleg US-E-12 and LY3BG family: Vytas and Rimas Kudelis, 
release notes are created by Igor UA3DJY on March 20th, 2017. 
Only JT65+JT9 combined mode is tested in JTDX software. Support being provided by Igor UA3DJY, 
email address: c_igor at inbox.ru

More detailed information, built software, link to the source code, optional user interfaces, 
HF CALL3.txt file, test results, release notes can be found in:

JTDX Web site: http://www.qrz.lt/ly3bg/JTDX/jtdx.html , many thanks to Vytas LY3BG for keeping
this resource.

JTDX Yahoo technical group:
https://groups.yahoo.com/neo/groups/JTDX/info

Russian JT65/WSJT-X forum:
http://forum.qrz.ru/6-cifrovye-vidy-radiosvyazi/44060-proekt-wsjt-x-mody-jt65-jt9-wspr-jt4-jtmsk-rabota-s-testovym-softom.html

Facebook group focused on the JTDX software usage: 
https://www.facebook.com/groups/JTDX.HF.evaluation/

CALL3.TXT file also being supplied together with the software installation package.

Starting from November 1st, 2016, CALL3.TXT data is based on JT65/JT9 spots made 
by JTAlert software http://hamapps.com and collected from http://hamspots.net resource. 
Many thanks to Laurie VK3AMA for this contribution.

__________________________________

Changes implemented in the source code.

r6462mod5:
- modified modulator: improved level fading at end of the message transmission.
- 'RRR' message is replaced with 'RR73' message. 'Log QSO' prompt can be triggered
  by transmission any of these messages: 'RRR', 'RR73', '73'  
- three-pass decoding is implemented, decoder thresholds optimized for each pass.
  Advanced settings tab now provides possibility to choose between two- and three-pass decoding.
- changes of the FFT window functions, optimized for number of correct decodes criteria.
- implemented spectrum distortion functions for each decoding pass, optimized these functions 
  basing on the maximum number of correct decodes
- implemented functionality of high sensitivity, control button Preamp in main UI window, and
  possibility to choose number of passes in the Advanced settings tab. 'Random erasure patterns'
  is set to 8 for Preamp mode, it is not affected by settings in the Advanced tab now.
  Decoder thresholds and spectrum distortion functions were optimized for each Preamp pass.
  Signal subtraction is used between Preamp decoding passes.
- removed 'Robust sync' manual activation from Advanced settings tab.
- improved user interface in the main window.
__________________________________

r6462mod6:
- improved accuracy in signal subtraction (eliminated error in number of the samples). Small
  changes to the user interface main window.
__________________________________

r6462mod7:
- user interface improved, splitter inserted between left and right parts of the main window 
- users now have choice between RRR and RR73 message
- nbirdie(extract.f90) value optimization brougth some more new correct decodes. nbirdie=7 being
  used for Preamp OFF mode, nbirdie=6 for Preamp ON mode
- number of decoding attempts for Preamp OFF mode is set to 100
- number of decoding attempts for Preamp ON mode now can be choosen from this range: 1000,2500,
  5000,7500,10000 via Advanced settings tab by values 1,2,3,4,5
__________________________________

r6462mod8:
- number of decoding attempts for Preamp OFF mode increased from 100 to 300
- implemented 'Filter' button/functionality: eliminating vast majority of the false decodes
- improved JT65 decoding efficiency for DT range [-1..0], this functionality is implemented
  only in the Filter ON mode by 26000 sample offset of the input data
- for all Preamp/Filter combinations increased JT65 DT decoding range
- for all Preamp/Filter combinations implemented some additional filtering of the false decodes
- standard CQ message is generated on WSJT-X start up, it should eliminate some cases of the empty 
  message transmission
- input data is reloaded if 'Filter' button is triggered, so it is possible to decode again latest
  RX interval data in any combination of the Filter/Preamp modes using button 'Decode'
__________________________________

r6462mod9:
- implemented dual SYNC search functionality with 1/4 symbol spectrum shift, getting more 
  correct JT65 decodes.
__________________________________

r6462mod10 JT65a optimization:
- is based on dual SYNC mod9, Preamp+Filter functionality, Preamp and Filter buttons deleted from UI
- SYNC search upper frequency is limited by 2700 Hz value
- new SWL mode/button introduced, providing maximum decoding efficiency
- for SWL OFF mode candidate ranking based on SYNC value being used
- for SWL OFF mode number of candidates is limited for each pass (17/35/35) basing on the statistics
- for SWL OFF mode dynamic decoding attempts as function of number of candidates implemented
- decoding time is optimized and normalized for SWL OFF mod, decoding efficiency is improved
__________________________________

r6462mod11 JT65a optimization:
- first decoding pass got two subpasses, both using the same SYNC list of candidates. 
  For subpass 1.1 maximum number of candidates is limited to 21, for subpass 1.2 to 25.
  Decoded signals being marked in the SYNC list and ignored while doing subpass 1.2.  
  In fact in mod11 revision we have got very effective four-pass JT65a decoding.
- SWL ON functionality is changed: now it is based on the SWL OFF functionality, simple 3 unit 
  offset is applied to the decoding attempts value settings for SWL ON mode. SWL ON and SWL ON decoding
  attempts approximately balanced for corresponding decoding time.   
__________________________________

r6462mod12 JT65a optimization, focused on weak signals reception:
- automatic weak signals decoding mode for number of candidates less than 9
- four passes are used for JT65a decoding with common SYNC candidate list if number of candidates 
  is less than 9
- SYNC threshold 3.0 being used to pass weak JT65a signal to the FTRSD decoder
- number of decoding attempts nvec is dynamically calculated for each pass basing on the number
  of good SYNC candidates, decoded signals being marked in the SYNC list and ignored while doing 
  passes 2,3,4
- srand function is used in the FTRSD decoder if number of candidates is less than 9
- improved decoding time balance for SWL OFF/ON modes
__________________________________

r4662mod14 changes:
- implemented hinted decoding for HF JT65a operation on the QSO frequency, hint65.f90 source code is 
  adopted from the WSJT-X v1.7 r6606 revision. CALL3.txt file shall be used for hinted decoding, only
  first 15000 records being processed in r6462mod14. JT65+JT9 combined mode only supported.
- attempt to eliminate r6462mod12 degradation of the JT65a signals decoding efficiency in the industrial
  noise band environment, mostly useful for 80/160m bands operation 
__________________________________

r646mod14.1
- fixed defect in logic of the choosing decoding passes: recovered signal decoding for the small number
  of SYNC candidates 
__________________________________

r646mod15
- implemented all standard messages for hinted decoding, added RR73 message, totally 66 messages/codewords
  generated per each record of the CALL3.TXT file
- up to 25000 records from CALL3.TXT file can be processed now
__________________________________

r646mod15.1
- implemented asymmetric tunable DT window for hinted decoding
- hinted decoding bandwidth also limited to 7Hz after the frequency correction
__________________________________
 
r646mod15.2
- implemented additional hinted decoder for 'DX Call' and 'DX grid' data
- hinted decodes now marked by the asterisk, not supported in the left decoding window if 'Show DXCC
  and worked B4 status' is enabled  
__________________________________

r646mod15.3
- additional criterion implemented for hinted decoding: distance between the best codeword 
  and Gaussian(AGWN) noise, increasing probability of hinted decodes for the CALL3 and DX Call decoders
__________________________________

JTDX v15.4
- additional, third criterion: multiplicative combination of the two previous criteria applied 
  in the CALL3 based hinted decoder, allowing to reduce number of the false CALL3 based hinted decodes
  with no decoder's sensitivity degradation
- DX Call based hinted decoder is stepped down to mod15.2 source code for non CQ messages only. 
  It reduced number of the DX Call based false hinted decodes as tradeoff of sensitivity
- corrected UI defect of mainwindow expansion for WSPR2 mode
- two new buttons are put in the main window: Hint and Clean DX, last one can be triggered by ALT-X combination.
  New buttons make user interface as more friendly one, allowing user to avoid some false hinted decodes.
- transition started from modified WSJT-X to standalone JTDX software  
__________________________________

JTDX v15.5
- proper software name indication in station information and statistics in the pskreporter.info wed site
- spots with RR73 grid locator blocked for reporting to pskreporter.info
- spots with hinted decodes blocked for reporting to pskreporter.info
- DXCall and DXGrid windows autoclearance if CQ button is clicked
__________________________________

JTDX v15.6
- fixed defect with SWL mode, after SW restart SWL mode on settings were not applied in previous versions
- fixed minor defect in UI1 where standard/free message windows size was shrinked, this defect coming from v15.4
- implemented additional, CALL3 based, wideband hinted decoder for CQ messages with -28dB SNR sensitivity, this functionality 
  can be activated by the Hint button. DT range is limited from -0.5 to 1.0 for this decoder.
- implemented CQ DX standard message, user can choose between CQ and CQ DX message using DX checkbox
- implemented Filter functionality: 400Hz bandwidth is used for decoding, 100Hz bandwidth is used for displaying decoded messages
- implemented asterisk indication of the hinted decodes for 'Show DXCC and worked B4 status' feature
- UI is modified with Filter button and DX checkbox to support new functionality
__________________________________

JTDX v15.7  JT65 functionality
- removed unnecessary spectra recalculation for every candidate, now JT65 spectra being recalculated only if previous
  candidate was decoded and signal subtracted. This fix shall make decoding a bit faster.
- turned on signal subtraction on the 3rd decoding pass, reduced number of the false FTRSD decodes
- fchisq65 and afc65b source code is modified, now providing better DT calculation accuracy and reduced number
  of the false FTRSD decodes
__________________________________

JTDX v15.8  JT65 functionality
- new wideband hinted decoder implemented for the CQ DX message
- turned on CQ and CQ DX wideband hinted decoders on the 2nd and 3rd decoding passes
- modifed source code fchisq65, got more linearity and better accuracy in DT calculation
  of the weak signals, bringing more correct FTRSD decodes
- implemented FTRSD decoder bypass if initial SYNC value on the QSO frequency is less 
  than 1.0
- implemented filtering of some false 17 and 18 character long FTRSD decodes if DT 
  of the signal is outside of the -0.5...1sec range, source code chkfalse.f90. CALL3.TXT 
  file data is used for this functionality and this filtering is not activated if number 
  of records in CALL3.TXT file is less than 16000. CALL3.TXT data loaded in memory 
  at the first attempt to check decoded message.
- modified JT65 signal simulator with CQ DX message
- minor change in UI, tab name Help -> About JTDX
__________________________________

JTDX v15.9  JT65 functionality
- correlation function thresholds (ccfbest variable) implemented for various negative DT ranges,
  this approach lets to decrease number of candidates hence decreasing decoding time
- fifth decoding pass is implemented. This functionality will gain number of the decoded messages
  if number of signals on the band is greater than 20. There is also gain in weak signal FTRSD
  and hinted decodings.
__________________________________

JTDX v16.0  JT65 functionality
- filtering of the false FTRSD decoded messages expanded down to the 14-character message length
- additional criterion(0.005sec DT offset) implemented to filter out FTSRD false decodes with grid 
  locators caused by the SYNC signal harmonics (bad TX signal or IMD in the RX path), the same 
  chkfalse.f90 source code is used for filtering, also based on the CALL3.TXT file
- checking for SYNC harmonics implemented, based on three criteria: DT offset, ccfbest value, 
  frequency greater than 1500Hz. Wideband hinted decoders bypass is used if signal meeting these
  criteria.
- mouse left button double click on the waterfall now triggering 'Filter' functionality where messages
  will be decoded and signals subtracted in 400Hz bandwidth, but only messages in 50Hz bandwidth 
  will be shown in the decoded messages window. This is a bit different from the 'Filter' button 
  functionality where messages shown in the decoded window within 100Hz bandwidth
- found and fixed defect: wrong signals were subtracted for hinted decodes
- cleaned up some rubbish and some not used code, many integer variables changed to the logical type.
__________________________________

JTDX v16.1
- JT65: eliminated minor defect of wrong signal subtraction for decoded messages on the QSO frequency 
  by the hinted decoders
- JT65: added new source code for calculation power of last 8 symbols of the SYNC signal. For the first pass 
  of decoding, list of the signals/candidates being sorted now basing on new criterion: multiplication 
  of the CCF and last 8 symbols power values. 
- JT65: implemented signal subtraction for the dupe decoded messages on the first pass of decoding 
- deleted JT65 program source code, this software was used for the test purpose
- deleted JT4 related Fortran source code
- JT65: withdrawn (21 + QSO frequency) number of candidates limitation for the first subpass of the first
  pass of decoding
- country file cty.dat updated to version CTY-2608
__________________________________

JTDX v16.2 JT65 functionality
- minor defect fixed: in v16.1 index of the dtchk data structure could go out of boundary
  if there is heavy distortion in the RX audio path. Two patches applied: index maximum value increased
  from 200 to 300 and maximum number of candidates for first decoding pass is limited to 150.
- activated four threads for Fast Fourier Transform in the filbig.f90 source code
- cleaned up and checked logic in source code jt65_decode.f90 sync65.f90 xcor.f90 symspec65.f90
- at first decoding pass in jt65_decode.f90 applied dynamic threshold for candidate choosing based
  on the first three most SYNC values, if there are less than 9 candidates detected in sync65.f90
- major defect fixed: starting from v15.9 values from FTRSD decoder were not passed to variables
  nrtt1000, nhard_min, ntotal_min in jt65_decode.f90. This bug caused most of the FTRSD false decodes.
- sync value thresholds increased in syn65.f90: for (QSO frequency +-1Hz) applied threshold 0.4,
  for (QSO frequency +-3Hz) changed threshold from 0.5 to 0.8. This changes eliminated some false hinted
  decodes as trade off of hinted decoding sensitivity on the QSO frequency.
- minor defect fixed: variable qsofreq was initialized in wrong place in sync65.f90
- applied corrected frequency value for signal subtraction in subtract65.f90
- Echo and ISCAT modes now accessible in the optional user interface only
__________________________________

JTDX v16.3 JT65 decoding functionality
- minor defect fixed: srand generator was used in FTRSD in 2nd...4th decoding passes if number of candidates
  is less than 8, this bug could cause some false FTRSD decodes
- minor defects fixed: in logic of candidate processing in decode65a.f90 and in making of the candidate list
  in sync65.f90 
- decreased SYNC threshold trhesh0 for first decoding pass in jt65_decode.f90 and sync65.f90 from 2.5 to 2.3,
  with automatic value choice of this threshold, based on the SYNC values of the signals 
- limited thresh3 usage in jt65_decode.f90 by first subpass of the first decoding pass
- reworked and changed decoder bypass decision logic, fixed minor bug that might cause some false decodes 
- limited DT range for making candidate list in sync65.f90 to -5.3 ... 5.2 sec
- changed sampling frequency value from 1378.125 to 1377.2321 in decode65a.f90, afc65b.f90, twkfreq65.f90
- increased resampling factor from 4 to 8 in fil6521.f90
- decreased LPF bandwidth twice in fil6521.f90, improved attenuation in stopband from 38 to 60dB
- adjusted reported SNR value
- multiple source code calculation accuracy and clean up changes
__________________________________

JTDX v16.4, JT65 decoding functionality
- defect fixed: wrong response message was selected on mouse double click 
  on the 'mycall hiscall RR73' message
- defect fixed: one of the variables in SYNC tail power calculation was not initialized
- defect fixed: 4 arguments were passed while calling decoder.f90 in jt9a.f90 subroutine 
  while only 3 are accepted
- came back to 1378.125 Hz sampling frequency in decode65a.f90, afc65b.f90, twkfreq65.f90: 
  corrected an accuracy error I introduced in v16.3 due to the wrong usage of calculator
- in filbig.f90: increased number of taps of the anti-aliasing LPF filter from 15 to 499, 
  fully utilising filtering efficiency in the frequency domain
- in fil6521.f90: increased number of taps of the anti-aliasing LPF filter from 21 to 23
- in fil6521.f90: implemented one more 21-tap LPF filter with 172Hz sampling frequency
  to improve further processing of the candidate's SYNC pattern
- adjusted fil6521.f90 processing delay in DT value, decode65a.f90 source code 
- changed to static ones some variables in the signal processing to reduce negative affect 
  of the current software memory leakage on the signal decoding stability
- in hinted decoders reduced number of the static variables to decrease memory usage
- adjusted SNR indication after filter changes in fil6521.f90
__________________________________

JTDX v16.6
- applied WSJT-X patches r6489,6518,6521,6523,6755,6756,6757,6762,6766

- changed default configuration settings(used for first start of JTDX software):
    mode=JT65+JT9, modeTX=JT65, LockTX=RX is OFF, CQ 
    waterfall settings: bin/pixels=5, JT65 2400 JT9, N Avg=1, Flatten is OFF, Current
    Advanced tab: decoding attempts=3, decoding passes=4, hinted decoding DT range=1
    Colors tab: default colors
    font settings of the decoded message: Consolas, 11, Bold   

- changed user interface UI1:
    interval time progress bar now has red color for TX, green color for RX
    clock moved, date is deleted
    dial frequency and UTC labels background colors changed to gray one, text to deep blue color
    direction of TX to RX and RX to TX frequency overwriting is shown by arrows now
    WSJT-X icon in the taskbar will be blinking if other application is active and decoded message containing user's call

- DXCC country prefix being now shown instead of the country name, it has no connection to the 'worked B4' functionality  

- decoded CQ message now being shown with text color instead of the background color

- changed 'Worked B4' functionality, background colors can be activated independently for any option and will be applied according
  to this hierarchy order:
    new DXCC per log
    new DXCC per band or (new DXCC per band and per mode)
    new call per log
    new call per band or (new call per band and per mode)

  Additional buttons created in Colors tab to support new 'Worked B4' functionality.

- changed configuration Settings, in the General tab added new 'Worked B4' and 'beep on my call' controls

- symbol '@' in the macros being now substituted by 'DX Call'

- fixed minor defect of the missed background color for AnswCQ label in the user interface

- added sound alert by system sound for user call presence in the decoded message. Starting from MS Windows Vista default Audio device
is used for this alert, in MS Windows 10 this system sound is called as 'default beep'. This functionality was not tested under Linux. 

- SkipGrid/Skip TX1 checkbox added in the QSO controls widget, message with report will be generated first if this box is checked.
  This functionality is aimed for making shorten QSOs. 

- defect fixed in symspec65.f90 source code, ref22(NSZ) array was not declared there

- mouse left button double click on the decoded standard message will change RX frequency if LockTX=RX checkbox is not checked. 
  If Ctrl button pressed, mouse left button double click on the decoded standard message will change RX and TX frequency.

- pressing F7 keyboard button will open log file wsjtx_log.adi by editor software set in the operating system for .adi extension
__________________________________

JTDX v16.6.1

- removed part of the r6755 patch from the source code HamlibTransceiver and TransceiverFactory in order
  to recover JTDX functionality under MS Windows XP 
__________________________________

JTDX v16.7

- code is added to recognise country properly for CQ NA, CQ AS and similar free text messages

- step deltaa(3) is changed to 2.0 value in the afc65b.f90 source code

- JT65 SYNC decimation filter is moved from time domain to the frequency domain, from fil6521.f90 to filbig.f90 source code, 
  fil6521.f90 source code is obsolete now

- current time and date is added to the status bar
__________________________________

JTDX v16.8

- interval time added to separation line in the left decoded text window

- new filters implemented in the filbig.f90 source code

- reworked source code: xcor.f90, afc65b.f90, fchisq65.f90 and twkfreq65.f90. 
  setup65.f90 source code is not used anymore for building software, required functionality moved to
  the decode65b.f90 source code.
  Minor changes in the decoder.f90, jt65_decode.f90, sync65.f90 and decode65a.f90 source code.

- minor changes in user interface UI1: smaller application window size can be set now by user

- application and widegraph titles are changed to JTDX, installation path is changed to C:\JTDX\

- SNR is adjusted in the -01...-31dB range with approximately 1dB accuracy. Simulated wav files were used for calibration, 
  SNR offsets 1dB step array added to the jt65_decode.f90 source code.
__________________________________

JTDX v16.9

- twkfreq65.f90 source code is not used for building software, frequency correction functionality is moved
  to decode65a.f90 source code

- linear signal frequency drift taken into consideration for signal subtraction

- corrected lag range for correlation function in the ccf2.f90 source code

- updated Hamlib3 for new transceiver's CAT support

- SYNC signal power calculation is implemented in the decode65b.f90 source code, dupe candidates with the same
  SYNC power are banned now to go to the decoders

- QSO frequency candidates now have second decoding attempt with 1 sample offset at 1378.125 Hz sampling frequency,
  it has improved decoder's sensitivity.

- in overcrowded band conditions and at first decoding pass: QSO frequency candidate from the first position 
  being now added to the last position of the candidate list, to get benefit from the signal subtraction

- defect fixed: mouse's left button double click on the waterfall(is used to decode signal again with Filter functionality)
  caused TX mode change from JT65 to JT9

- major defect fixed in making of the candidate list, source code sync65.f90, this bug affected decoding stability
  starting from JTDX version 16.3  
__________________________________

 JTDX v16.9.1

- false decode filters are reworked for FTRSD decoder in the source code decode65b.f90

- new candidate selection criterion is implemented for decoding passes 2...4 in sync65.f90. 
  DT is multiplied by SYNC value, candidates with -0.5...+1 sec DT range have highest priority, linear 
  DT slope factor function is applied to the criterion for candidates having DT outside of this range.    
__________________________________

 JTDX v17.0.1

- software installation is changed, logbook and settings file are stored in folder %LOCALAPPDATA%\JTDX,
  settings file has name JTDX.INI now. Prefix in the interface name for UDP connection is changed from
  WSJT-X to JTDX.

- implemented mutiple instances support for JTDX <-> JTAlert interaction, where multiple JTDX instances running
  using key '--rig-name=' (suffix of the interface name for UDP connection). This functionality is supported
  in JTAlert 2.8.5. Every JTDX instance shall be configured with unique UDP port number in the Settings-Reporting
  tab.

- defect fixed: starting from JTDX v16.9 there was excessive decoding time if there were few signals
  on the band. This defect also caused too high sensitivity of the Hint decoders and some false hinted decodes.

- WSJT-X patches r7229, r7233 are applied: TX audio level settings saving per band

- TX audio level settings saving feature is expanded to the 'per band and per mode' basis,
  many thanks to Arvo ES1JA for provided source code and testing this functionality  

- minor change in the functionality is done: TX mode is set to JT65 instead of JT9 if user changing
  mode from WSPR to JT65+JT9

- minor change in configuration is done: hyphen sign is allowed now in 'My Call' window, letting to 
  use complex SWL callsigns for band monitoring with spots reporting. Many thanks to Oleg US-E-12 for
  provided solution.

- software crash is fixed, caused by getting index of the dtchk() data structure out of the top bound.
  Message 'input audio signal is distorted' being generated now and decoding this minute interval being
  interrupted, while software will handle this issue and will continue to work.

- Hint decoders bypass is implemented for scenario where signal SNR is greater than -05. This solution
  will allow to decrease number of the false hinted decodes for distorted audio signal with no affect 
  on the sensitivity.
__________________________________

 JTDX v17.1

- decoding passes logic is changed in jt65_decode.f90, in result there is increased number of the weak 
  signals decoded by FTRSD

- defect is fixed, if callsign is clicked in JTAlert initial CQ message is now propagated into RX frequency
  window. Many thanks to Arvo ES1JA for this patch. Thanks to Ed K0KC for reporting of this bug.

- changed functionality for accepting decoded message from two Hint decoders operating on the RX frequency:
  decoded Hint message is banned as the false one if there was message decoded by BM/FTRSD on one 
  of the previous decoding passes that contains the same callsigns. It should reduce a bit number of the false 
  Hint decodes. Thanks to Luc VE2FXL for reporting of this scenario.

- new functionality is implemented for one of the four Hint decoders which working on RX frequency with CALL3.TXT
  data: five minute (5 min 14 seconds) timer is (re-)started at end of the each transmission or if Hint button 
  is activated by user, it is used to automatically enable/disable propagation of the non-CQ decoded Hint messages 
  from this decoder. The messages will be shown on the screen if timer is running and are banned if timer is expired.
  Hence if user making QSO then all messages being accepted from this decoder, if user going to the passive mode of band 
  monitoring then in five consecutive RX intervals non-CQ messages from this decoder will be banned. Such approach 
  will let user to reduce number of the false Hint decodes being in the band monitoring mode.
  Thanks to Luc VE2FXL for reporting of this scenario.

- first step done towards assisted BM/FTRSD decoder functionality. Upon exceeding defined thresholds decoded messages 
  being checked with the matched filter against the received signal. If it is free message in it is not matched, then
  this message is banned. In case it is standard message and it is not matched, then it is checked against CALL3.TXT
  data if any of two callsigns exists in the CALL3.TXT. Standard message being treated as false one if both callsigns
  are not found in the CALL3.TXT file.
  This approach lets to ban from 30 to 50 percents of the false FTRSD decodes.

- expanded sound notifications for the 'non-worked B4' status functionality. Many thanks to Vytas LY3BG and 
  his son Rimas Kudelis for supplied source code and making tests of this functionality.
__________________________________


 JTDX v17.1.1  - is based on JTDX v17.1, has got alternative 'new one' notification functionality implemented 
 by Arvo ES1JA
__________________________________


 JTDX v17.2

- fixed wrong UTC indication if interval or audio wav file being decoded again by Decode button

- fixed wrong 'new one'(worked B4) functionality notification for single JT9 or JT65 mode of operation, many thanks to
  Vytas LY3BG and Rimas Kudelis for this patch

- auto stop Hint five minute timer is also applied to DX Call Hint decoder.
  Thanks to Luc VE2FXL for reporting of this scenario.

- directional CQ WSJT-X patches 'CQ AA'- 'CQ ZZ' (E9AA-E9ZZ) r7289, r7294 are applied. It is standard type message user
  may type now in the free message box

- '@ TNX 73' TX macro is set as default free message, where '@' symbol handles 'his call'

- RX frequency CALL3.TXT data based Hint decoder is split to the message specific decoders, memory usage for this
  group of the Hint decoders is reduced. There are three decoders now in this group:
  - 'CQ hiscall hisgrid' message decoder
  - 'mycall hiscall hisgrid' message decoder
  - 'mycall hiscall report' message decoder, where report is -01...-30 only. R-01...R-30 report messages 
     are not supported now in this group as these messages are covered by DX Call hint decoder

- new wideband experience based Hint decoder is implemented, bringing approximately 5% more decoded messages for number
  of decoding attempts set to 1 in the Advanced tab. This decoder using call/frequency data from the last two consecutive 
  RX intervals.
__________________________________

 JTDX v17.2.1  - is based on JTDX v17.2, has got alternative improved and expanded 'new one' 
 notification functionality, implemented by Arvo ES1JA. This version is especially created 
 for public testing and this 'new one' notification functionality might come in the main JTDX branch 
 if accepted by majority of users.
 
 It is recommended to use default colors until this functionality is understood by user, and to set only
 required criteria for checking.

 So far it is possible to reset color settings to the default values, only if JTDX.INI file is deleted.

- fixed bug (v17.1.1) where grid locator was not extracted correctly from
 the non-CQ standard messages.


- strikethrough or underline may now be used as notification for the Woked Call in CQ and MyCall messages.
  Underline is set by default.

- background color may now be used for the Worked Call notificaton, standalone or togehter with 
   
   strikethrough or underline of the decoded CQ  and MyCall messages.

- if 'Inverse text/background color' checkbox is checked:

   'CQ' and 'MyCall' messages met the 'New..' criterion will use their setting's text color as the backgound color,
    while 'new..' color will be used for text in these messages. If there 'New..' criterion is not met then 'Worked Call'
    color will be used for text in these messages if it is activated.

    Tx messages always have background color notification.

    All other standard messages will be using 'Standard Message' background color and 'New...' text color 
    notification if 'Check all standard messages' checkbox is checked, otherway there is no any checking performed
    for these messages.


- user now can choose 'Standard message' background color (in 17.1.1 it was hardcoded as gray one).
  Gray color us set by default. 

__________________________________

 JTDX v17.2.2  - is based on JTDX v17.2.1, has got alternative improved and expanded 'new one' 
 notification functionality, implemented by Arvo ES1JA. This version is especially created 
 for public testing and this 'new one' notification functionality might come in the main JTDX branch 
 if accepted by majority of users.

 v17.2.2 fixes some bugs found in the version 17.2.1:

- Bold font usage failure

- '@ TNX 73' TX macro is set as default free message, where '@' symbol handles 'his call',
   user would have to delete old JTDX.INI file to make this change visible

- several bugs where 'New ..' status was incorrectly reported

Important note to the functionality description: 'Worked..' notification is a remaining action of the 'New..' checks,
and as per design it being applied to 'CQ' and 'MyCall' messages only.

__________________________________

 JTDX v17.3  - is based on v17.2 source code, JT65 functionality:

- DX Call based Hint decoder is split to the four focused decoders, bringing JT65 decoding sensitivity 
  down to -34dB SNR:
  - decoder for CQ/CQ DX messages
  - decoder for messages with '-' reports
  - decoder for messages with 'R-' reports
  - decoder for RRR/RR73/73 messages

- time transition from 23:5x to 00:0x is covered by uninterrupted interval numbering within 7 consecutive days 
  of running JTDX software, this lets to support experience(previous intervals) based Hint decoders funcionality 
  for the date change time window

- new wideband experience(previous intervals) based Hint decoder is implemented for the basic CQ and full range of 
  directional CQ messages (CQ AA to CQ ZZ)

- disabled RX frequency CALL3.TXT based Hint decoder, which processed report "-" messages. This functionality 
  is covered by DX Call based Hint decoder with better sensitivity and less resource being used.

- for DXCall based Hint decoders, excluding CQ/CQ DX decoder, data from previous decoded intervals being used now
  together with data from the DXCall window

- excluding CQ/CQ DX message, other DXCall Hint decoders using additional trigger for getting turned on: RX frequecy
  change

- adjusted thresholds for all 10 Hint decoders using ratio (maximum sensitivity)/(acceptable number of the false decodes) 
  as criterion   

- expanded filters for the false FTRSD decodes, being now used QTH grid square and callsign prefix data

- modified filter of the standard messages for the 'new one' notifications

- notification settings are put in the common tab with the color settings, 'Notifications' tab in the Configuration 
  user interface

- applied WSJT-X patch r7360, to recover CW ID transmission for long callsigns

- updated CALL3.TXT file as of December 12th 2016, 17340 records, supplied with the JTDX software package.

Now there are 10 Hint decoders in the JTDX v17.3 software, using matched filters in wide bandwidth or RX frequency,
focused on some range or specific messages, and using data from CALL3.TXT file or from previously decoded 
intervals or from DXCall/DXGrid windows. All these decoders are activated by the Hint button, but some of them
being turned off using timer and being brought back in service by transmission of the message of by change of the RX
frequency.

There is unchangeable DT window set in the code for some Hint decoders, previous intervals data based Hint decoders 
using +-0.2sec DT window to the last decodes to process candidate, and only for two Hint decoders working on 
the RX frequency and based on the CALL3.TXT data user may change DT range in the General->Advanced tab settings.

JTDX software is made in such way that vast majority of the Hint decoders functionaly goes invisibly to user, and
from user's point of view all Hint decoders being controlled by the Hint button. 
  
__________________________________

 JTDX v17.3.1  - is based on v17.3 source code, notification functionality is based on the v17.2.2 source
 code and implemented by Arvo ES1JA

- displaying country name/prefix is aligned

- notification filters are implemented and improved for all possible standard messages

- now it is possible to apply striked/underlined 'worked B4' notifications to the standard messages other
  than containing 'CQ' or 'MyCall'. This functionality may be switched on/off by user.

__________________________________

 JTDX v17.3.2  - is based on v17.3.1 source code, vast majority of the changes made by Arvo ES1JA

- fixed bug of new DXCC notification if there is no user callsign set in the settings

- fixed defect that allowed to check in 'Show prefix not name' box if 'Show DXCC names' is not checked

- more filters added to prevent 'New one ' criteria being triggered by the free text messages

- deleted checkboxes for setting striked/underlined 'Worked B4' notifications for other than CQ/MyCall
  standard messages

- changed color notifications for other than CQ/MyCall standard messages from background color to the text
  color. Now all checks setting the same attribute: either background color or text color.

- some changes for 'Bold' font attribute usage: now all 'New ' criteria checks setting 'Bold' attribute for 
  decoded text message, if any criterion is met

- added QSO counter in the status bar, at right bottom corner of the user interface. wsjtx_log.adi being 
  used to count JT65/JT9 contacts.

- added date for every decoded message in the ALL.TXT file. It shall simplify searching for any QSO missed
  in the logbook.

  It is not recommended to set 'Bold' attribute in the decoded text font settings(Settings->General tab),
  as 'Bold' attribute being used in the 'New one ' notification functionality.

__________________________________

 JTDX v17.4  is based on the v17.3.2 source code

- all FTRSD false decode filters reworked and moved as block close to the FTRSD decoder, allowing to attempt
  decode candidate with Hint decoders if decoded message is considered as the false one

- implemented AGC compensation functionality, where noise level change triggered by AGC operation in the receiver
  being compensated in JTDX software, bringing improved decoding efficiency while AGC is in operation.
  AGCc button is implemented in main user interface to turn ON/OFF this functionality. 
  This button shall be turned off by user if JT signals are not strong enough to trigger AGC or if 
  AGC is turned OFF in the receiver.

- most of the checkings for the false FTRSD decode now based on information from the ALLCALL.TXT file.
  This file is installed into /bin/data/ path by the JTDX v17.4 installer and has a list of callsigns spotted
  in JT modes for last couple years. CALL3.TXT file being now mostly used for Hint decoders operation and 
  containig data from JT spots of the last months.

- 'New one' notification functionality is modified: added preview pane in the Notifications tab of the settings.
   It has simplified notification color settings. This functionality is designed and implemented 
   by Arvo ES1JA.

- decoded message windows now have table format. Special cell with red color background being used now
  for additional notification for decoded messages containing MyCall. It makes easier to recognise decoded
  messages if somebody responding to user outside of the RX frequency.  

- now user can send QSO data to the eQSL server. Configuration settings are added to the Reporting tab.
  This functionality is implemented by Arvo ES1JA and may be switched ON/OFF by user.

- introduced independent notification funcationality per band and per mode. This functionality is 
  designed and implemented by Arvo ES1JA.

- implemented selective DXCall Hint decoders activation based on the last transmitted message.
  This feature has reduced number of the false Hint decodes on RX frequency during the QSO.

- applied +-0.2 second DT window to most of the DXCall Hint decoders, centered to DT value of the last decoded
  signal. This functionality has reduced number of the false Hint decodes on RX frequency during the QSO.

- CQ/CQ DX DXCall Hint decoder is splitted to two decoders: one is for CQ, other is for CQ DX message.
  Temporarily suppressed sensitivity of the CQ DX message DXCall Hint decoder, planning to finish this
  functionality in the next JTDX version.

- new DXCall Hint decoder is introduced for 'MyCall + HisCall + GRID' message, just in case of retransmission 
  of this message during the QSO. Now JTDX v17.4 has got twelve Hint decoders.

- now SRAND random number generator is used in FTRSD decoder for any signal candidate coming with SNR 
  less than -24dB. Combined with several decoding passes, SRAND usage has increased decoding efficiency 
  of the weak signals.

- expanded DECODE button usage to decode again the JT9 signals, that might be used while switching ON/OFF AGCc
  button.
__________________________________

 JTDX v17.5  is based on the v17.4 source code

- memory allocation is reworked for the large arrays of JT65 and JT9 signals

- defects fixed: ALLCALL.TXT file allocation for MAc OS-X and Linux builds, several bugs in the 'notifications'
  functionality, wrong GRID square indication in DX Grid window if any other callsign's report/RRR/73 message 
  is clicked, wrong country name displaying for free text messages containing TU73, in notification about loss
  of connection to the eQSL server, wrong interval time displaying if JT9 messages decoded again using Decode
  button, added extra notification about copying CALL3.TXT file to the log directory, bug of displaying messages
  with internally used 'CF00' Grid square in the wideband experience based Hint decoder, callsign truncation to
  5 characters at displaying of the decoded WSPR messages, withdrawn 13-character limitation in Configuration
  line edit for macros entry, truncation of text on labels in the main interface status bar, alignment of messages 
  color background in the RX frequency window

- modified main window UI1 and Configuration UI, added link to JTDX Web page in the Help

- configurable automatic clearance of DXCall DXGrid upon exit from JTDX is added for UR5EQF logbook software users

- added beep notification on the first decoded message in the RX interval

- added combobox color notification if text message length in the Free text message combobox is exceeded 13 (for 
  free message) and 17 (for directional CQ message with 6-character callsign) characters

- added background color notification about current minute and TX ODD/EVEN checkbox settings

- reworked wideband previous intevals data based Hint decoder, it is made as selective one to the expected message
  and internally splitted to 6 focused decoders. In result is reduced number of the false Hint decodes.
  Total number of Hint decoder subroutines in v17.5 is 11, total number of the Hint decoders now is 16.  

- reworked DXCall/DXGrid based Hint decoder of the CQ messages, now any directional CQ message being supported 
  in this decoder

- FTRSD and wideband CQ/CQ DX messages Hint decoders bypass is applied, if SNR of the candidate signal is less
  than -30.0dB SNR. A bit decreased time of decoding and number of the false Hint decodes. 

- For BM/FTRSD decoder is added three more decoding passes focused on the QSO RX frequency (bandwidth is +-3Hz),
  time to frequency domain conversion and candidate list renew being used for each of these decoding passes, up
  to two candidates in the list per each decoding pass.
  This functionality is applied after the first wideband decoding pass and may not be turned OFF, only BM/FTRSD
  decoder being involved in this functionality, decoding efficiency is optimized. 
  User can set number of RX frequency decoding attempts for the new RX frequency decoding passes in the Advanced
  tab. There is solid increase in FTRSD decoding efficiency of the weak signals on the RX frequency for minimum 
  number of the decoding attempts set in Advanced tab.
  With this functionality JTDX may decode up to 7 signals on the QSO RX frequency.

- changed bandwidth for noise part of SNR calculation from approximately 560 to 180Hz, SNR is recalibrated using
  simulated signals from .wav files

- <eQSL_QSL_SENT:1>Y being added to the wsjtx_log.adi file if QSO data is sent to eQSL server, waiting for response
  from the eQSL server is increased to 10 seconds

__________________________________

 JTDX v17.5.1 is based on the v17.5 source code

- recovered AGCc functionality that is broken in v17.5

- added notification for possibly false FTRSD decoded standard messages: questionmark with yellow background, right
  after the message. Such messages being blocked for sending to the pskreporter.info server.

__________________________________

 JTDX v17.5.2 is based on the v17.5.1 source code

- some WSJT-X patches are applied: 6581,6588,6589,6590,6597,6599,6618,6622,6636,6650,6651,6658,6659,6660,6661,6703,
  6705,6750,6755,6766,7030,7031,7032,7038,7039,7122,7124,7130,7293,7320,7390,7357,7457

- skipped audio .wav files recording to HDD if user selected 'Save -> None'

- reworked anti-aliasing filter for 48000 -> 12000 Hz sampling rate conversion of the RX signal

- decoded standard messages for worked DXCC/Grid square/Callsign may now be skipped in the decoded messages window 
  using new control checkbox 'Don't show it' in the Notifications tab. This functionality may be applied to CQ messages
  by default and to other standard messages if 'Check other standard messages' checkbox is checked there.

- updated Hamlib to the latest version

- several changes done to prevent dupe Hint decodes appear in the decoded message window

- software development kit is changed from Qt 5.2 to Qt 5.5. There now more fonts available in the JTDX drop down menu, 
  also decreased size of the JTDX installation package. Those users who building JTDX themselves under MS Windows shall 
  now switch Qt environment using commands 'enable-qt55' and 'build-hamlib3'.

- KG4W callsign is added to cty.dat file VA, USA

- added combobox color notification if text message length in the tx5 message combobox, tab 1 of QSO messages, is 
  exceeded 13 (for free message) and 17 (for directional CQ message with 6-character callsign) characters

- fixed bug in Filter functionality: in previous versions left mouse button double click on the waterfall caused whole
  JT65 frequency range decoding instead of the 400 Hz.

- several criteria are applied to prevent false CQ Hint decodes in presence of the strong JT65 signal on the band

__________________________________
 
 JTDX v17.5.2-SWL  is based on the v17.5.2 source code

- expanded JT65 SNR reporting range from -35 to +35dB, SNR levels calibrated up to +35dB using simulated
  .wav audio files

- banned transmission of the messages, as JT65-HF software does not support reception of messages
  with reports in the extended range

__________________________________
 
 JTDX v17.6  is based on the v17.5.2 source code

ATTENTION: built v17.6 package has shifted dynamic range towards weak signals and superior performance in weak
signal decoding by FTRSD at poor propagation conditions if there are less than 12 signals on the band.
Top part of dynamic range will be addressed in v17.6.1 where the same source code will be used, difference only 
in the specific build. So far we do not know why dynamic range being shifted at specific build. 

- fixed bug of color inversion in the notification functionality, occured if there is not any checking 
  criterion chose.

- fixed bug where TX mode was changed if there other mode signal is decoded on the RX frequency

- fully dynamic decoding attempts recalculation based on the remaining number of candidates per each wideband 
  decoding pass. It has brought some more efficiency for weak signals decoding by FTRSD if there are few signals 
  on the band.

- 'hide messages from continents' functionality: it is some kind of the virtual DX window where local signals may
  being not shown. Effectevily reducing information overloading to user.

- 'beep on the wanted callsign' functionality: it will let user to avoid continious visual screen monitoring, 
  replacing it with the sound notification. System sound being used from default playback device set in 
  the operating system. At the moment callsign lenght is limited to 6 characters. Rest of any decoded message 
  shown on the screen being checked for the wanted callsign. 

- some improvement of the AGC compensation functionality for JT65 signal decoding

- changes in the mainwindow interface: TX odd/even checkbox is replaced with the button, more suitable allocation 
  is chose for it.

- now JTDX does support up to 200 JT65 decoded messages

- two frequency mask decoding passes added. Frequency mask being derived from the first decoding pass.
  Frequency mask decoding is enabled in the code by default, depending on number of the signals on the band 
  software making decision to turn it OFF (software does recognize band conditions and frequency mask decoding 
  can be automatically turned off if there are too many signals on the band). New setting in the Advanced tab 
  does prohibit turning frequency mask decoding passes OFF, it makes some benefit for overloaded band scenario 
  and shall be used if user has fast CPU.

- 'bad data' diagnostic print is replaced with 'audio gap detected'. In such scenario some sample being filled with
  1.0 value and software attempting to decode this RX interval. It was not allowed in the previous JTDX versions. 

- reduced number of calculations and expanded time range for weak level of the input signal detection.
  Diagnostic print 'low rms' is replaced with the 'input signal low rms', as in the previous JTDX versions such RX
  interval being not passed to the decoders.

- increased number of processed records: up to 40k in file ALLCALL.TXT and up to 35k in file CALL3.TXT

- updated in software file ALLCALL.TXT. There is new CALL3.TXT being supplied along with the software package, this
  new file is not compatible with JTDX software versions earlier than v17.6.

- changed type of data in the large Hint arrays from 4 bytes to the 1 byte. It has allowed to decrease allocated 
  memory volume caused by the CALL3 file extension.

- audio buffer size is changed in software: for input signal from 100ms to 2 seconds, for output signals from 1 to 
  2 seconds

- top frequency border for JT65 signal decoding is increased from 2700Hz to 3000Hz

__________________________________

 JTDX v17.6.1  is based on the v17.6 source code

v17.6.1 has effective JT65 signals decoding in overcrowded band conditions. v17.6 has better sensitivity for weak 
signal decoding in low populated band conditions versus v17.6.1. There are two possible reasons to make upgrade 
from v17.6 to v17.6.1: if user has slow CPU and can not use frequency mask decoding, or user need to fix bugs 
described below. Also both version can be used on the same computer if installed in the different folders. 

- fixed bug in inverse color notifications for other standard messages

- fixed bug in distance calculation for grid QTH square on the same longtitude: applied WSJT-X patch r7045.

__________________________________

 JTDX v17.7  is based on the v17.6.1 source code

- there is a gap at 1-st second of input data under Windows XP, source code is changed to fill in
  this gap and to prevent 'audio gap detected' diagnostic message to appear on the screen in this
  scenario

- now JTDX works with no CALL3.TXT file,  while there some functionality will be missed
  in Hint decoders and recognition of the false FTRSD decodes if CALL3 file is missed. There are
  up to 4 reminders to copy CALL3.TXT file to the log directory after each start of the JTDX
  software, each reminder being triggered by various parts of the source code.   

- changed program's icon and installation logo

- added waterfall graphics for Filter button

- increased allowed length from 'beep on wanted callsign' to 11 characters

- added validators for DX Call, DX Grid and wanted callsign windows line edit

- changes for the signal meter: range expanded to 90dB, measuring peak values 
  rather than rms, color being changed for too weak or too strong signal.
  Signal meter indication now allowing user to match input signal dynamic range 
  with ADC dynamic range and JTDX dynamic range, also can be used to evaluate noise level 
  of the sound card's input.

- RX gain slider deleted from main user interface.

- new 'Filter' tab in configuration user interface

- added 'hide free messages' filter option for non RX frequency 

- reduced minimal size and changed proportions for large size of the main user interface

- redistributed number of decoding attempts for Advanced tab settings 'Number of decoding attempts' =1 or =2, 
  users with these settings will get more weak signals decoded in comparison to v17.6

- fixed bugs: wrong UTC at decoding again in JT9 mode (Decode button usage),
  prolonged decoding at decoding again in JT9 mode (Decode button usage)

- increased decoding efficiency of JT9 Fano decoder at RX frequency: more decoding attempts being used

- decoding JT9 again: for TX mode = JT9 pushing Decode button triggering attempt to decode JT9 signal 
  on RX frequency again with more decoding attempts being used, bringing the best decoding efficiency. 
  Decoding bandwith is +-2 Hz relatively to the RX frequency, number of candidates is limited to 2.

- changed 'decode again' logic: if TX mode is set to JT9 then JT65 decoder will be bypassed, 
  if TX mode is set to JT65 then JT9 decoder will be bypassed

- enabled decoding at rest of RX interval: decoding after late start of JTDX, decoding 
  after the halted TX in the same minute interval. Threshold is set to 35th second of the minute 
  interval and it is still possible to decode -01dB SNR JT65 signals from remaining 12 seconds 
  of message transmission. Band change: if it is changed after 12th and prior 35th second of 
  an RX interval then signals from both bands will be decoded, if it is changed after 35th second 
  of an RX interval then signals from previous band will be decoded.

- added new 20m subband in selection for shared JT65/JT9 operation from 14080 to 14085 KHz. 

__________________________________

Clicking by mouse (AGCc ON/OFF + Decode) or (SWL ON/OFF + Decode) or (Filter ON/OFF + Decode) or (Hint ON/OFF + Decode) sequence 
triggering one more attempt to decode latest interval.
__________________________________

-26/-28/-29/-31dB SNR JT65 simulated files can be shared upon email request.

SNR calibration wav files are published there:
https://cloud.mail.ru/public/B5Dz/5m6PQ4fNi
__________________________________
Test results, JT65a, number of decoding attempts=1, decoding passes=4:

Wideband experience based Hint decoder
test Web SDR audio files https://cloud.mail.ru/public/LrVm/zEkJ1ZVLg
CALL3.TXT file as of November 2nd, 2016, 21570 records

SW version / total JT65 decodes / BM-FTRSD decodes / wideband CQ/CQ DX Hint / experience based Hint / JT9 /
v17.2 Hint OFF / 3087  / 3087  / -  / -  /
v17.2 Hint ON  / 3296  / 3055  / 61* / 180* / -  /
v17.3 Hint ON  / 3315  / 3028  / 94* / 193* / -  /
v17.4 Hint OFF / 3123  / 3123  / -  / -  / 374  /   # AGCc is OFF
v17.4 Hint OFF / 3162  / 3162  / -  / -  / 378  /   # AGCc is ON
v17.4 Hint ON  / 3355  / 3064  /  98 / 193 / -  /   # AGCc is OFF
v17.4 Hint ON  / 3432  / 3083  / 127 / 222 / -  /   # AGCc is ON
v17.5 Hint ON  / 3332  / 3060  / 100 / 172 / -  /   # AGCc is OFF

v17.6 Hint OFF / 3118  / 3118  / -  / -  / 374  /   # AGCc is OFF frequency mask is OFF
v17.6 Hint OFF / 3158  / 3158  / -  / -  / 377  /   # AGCc is ON frequency mask is OFF
v17.6 Hint OFF / 3174  / 3174  / -  / -  / 377  /   # AGCc is ON frequency mask is ON

*it is not possible to confirm every hinted CQ/CQ DX decode from these
SDR audio files is correct one.
-----------------------

Wideband CQ messages Hint decoder, -28dB SNR files, CALL3.TXT based:

v16.4   37.5%  --- CALL3.TXT/20480 records
v16.6   37.3%  --- CALL3.TXT/20480 records
v16.7   36.1%  --- CALL3.TXT/20480 records
v16.8   37.9%  --- CALL3.TXT/20480 records
v16.9   38.4%  --- CALL3.TXT/20480 records
v16.9.1 39.5%  --- CALL3.TXT/20480 records
v17.0.1 37.6%  --- CALL3.TXT/21570 records
v17.1   37.8%  --- CALL3.TXT/21570 records
v17.2   37.9%  --- CALL3.TXT/21570 records 
v17.3   38.4%  --- CALL3.TXT/21570 records  only hintwidecq. hintwidedx decoders, others bypassed
v17.4   38.7%  --- CALL3.TXT/21570 records  only hintwidecq. hintwidedx decoders, others bypassed
v17.4   89.6%  --- CALL3.TXT/21570 records  no test bypass used

-----------------------

Wideband CQ DX messages Hint decoder, -28dB SNR files, CALL3.TXT based:

v16.4   36.4%  --- CALL3.TXT/20480 records
v16.6   37.0%  --- CALL3.TXT/20480 records
v16.7   35.0%  --- CALL3.TXT/20480 records
v16.8   35.1%  --- CALL3.TXT/20480 records
v16.9   36.4%  --- CALL3.TXT/20480 records
v16.9.1 37.3%  --- CALL3.TXT/20480 records
v17.0.1 35.9%  --- CALL3.TXT/21570 records
v17.1   35.6%  --- CALL3.TXT/21570 records
v17.2   36.1%  --- CALL3.TXT/21570 records
v17.3   36.7%  --- CALL3.TXT/21570 records  only hintwidecq. hintwidedx decoders, others bypassed
v17.4   36.6%  --- CALL3.TXT/21570 records  only hintwidecq. hintwidedx decoders, others bypassed
v17.4   37.6%  --- CALL3.TXT/21570 records  no test bypass used
-----------------------

CALL3 based, QSO frequency hinted decoder, -29dB SNR simulated signals, 1000 files,
decoding probability:

v16.4   54.7%  --- CALL3.TXT/20480 records
v16.6   54.7%  --- CALL3.TXT/20480 records
v16.7   52.9%  --- CALL3.TXT/20480 records
v16.8   56.0%  --- CALL3.TXT/20480 records
v16.9   58.0%  --- CALL3.TXT/20480 records
v16.9.1 59.0%  --- CALL3.TXT/20480 records
v17.0.1 57.9%  --- CALL3.TXT/21570 records
v17.1   58.0%  --- CALL3.TXT/21570 records
v17.2   this decoder is obsolete starting from v17.2
-----------------------

CALL3 based, QSO frequency group of decoders, -29dB SNR simulated signals, 1000 files,
decoding probability:

'CQ hiscall hisgrid' message decoder
v17.2   60.5%  --- CALL3.TXT/21570 records
v17.3   60.3%  --- CALL3.TXT/21570 records

'mycall hiscall hisgrid' message decoder
v17.2   58.4%  --- CALL3.TXT/21570 records
v17.3   63.9%  --- CALL3.TXT/21570 records

'mycall hiscall report' message decoder
v17.2   52.7%  --- CALL3.TXT/21570 records
v17.3   this decoder is obsolete starting from v17.3
-----------------------

DX Call based, QSO frequency hinted decoder, -31dB SNR simulated signals, 1000 files,
decoding probability:

v16.4   36.2%
v16.6   36.5%
v16.7   33.6%
v16.8   36.1%
v16.9   40.2%
v16.9.1 44.4%
v17.0.1 43.4%
v17.1   43.6%
v17.2   43.7%
v17.3   51.3% CQ/CQ DX messages decoder
v17.4   52.6% CQ message decoder
v17.4   56.7% 'MyCall + HisCall + GRID' message decoder
-----------------------

DX Call based, QSO frequency CQ/CQ DX messages decoder, -33dB SNR simulated signals, 1000 files,
decoding probability:

v17.3   10.5% 
-----------------------

DX Call based, QSO frequency CQ/CQ DX messages decoder, -35dB SNR simulated signals, 1000 files,
decoding probability:

v17.3   1.6% 
-----------------------

SDR audio files with more than 20 signals in each file, decoding test results:
test files: https://cloud.mail.ru/public/9Dfk/xrP5GvfYR

          correct/ false decodes
v16.4 hint off   3172/6
v16.6 hint off   3168/7
v16.7 hint off   3189/9
v16.8 hint off   3198/3
v16.9 hint off   3214/6
v16.9.1 hint off 3229/1
v17.0.1 hint off 3230/2
v17.1 hint off   3231/4
v17.2 hint off   3232/5
v17.3 hint off   3232/0
v17.4 hint off   3228/1
v17.5 hint off   3227/0
v17.5.2 hint off 3231/1
v17.6 hint off   3202/1 frequency mask is OFF
v17.6 hint off   3231/2 frequency mask is ON
v17.6.1 hint off 3225/4 frequency mask is OFF
v17.6.1 hint off 3232/0 frequency mask is ON
v17.7 hint off 3215/1 frequency mask is OFF
v17.7 hint off 3238/3 frequency mask is ON

v16.4 hint on    3248/4  *  --- CALL3.TXT/20480 records
v16.6 hint on    3251/4  *  --- CALL3.TXT/20480 records
v16.7 hint on    3272/9  *  --- CALL3.TXT/20480 records
v16.8 hint on    3284/4  *  --- CALL3.TXT/20480 records
v16.9 hint on    3300/7  *  --- CALL3.TXT/20480 records
v16.9.1 hint on  3306/1  *  --- CALL3.TXT/20480 records
v17.0.1 hint on  3304/1  *  --- CALL3.TXT/21570 records
v17.1 hint on    3310/4  *  --- CALL3.TXT/21570 records
v17.2 hint on    3354/3  *  --- CALL3.TXT/21570 records
v17.3 hint on    3376/0  *  --- CALL3.TXT/21570 records
v17.4 hint on    3372/0  *  --- CALL3.TXT/21570 records
v17.5 hint on    3366/1  *  --- CALL3.TXT/21570 records
v17.5.2 hint on  3361/3  *  --- CALL3.TXT/21570 records
v17.6 hint on    3350/1  *  --- CALL3.TXT >25000 records frequency mask is OFF
v17.6 hint on    3349/5  *  --- CALL3.TXT >25000 records frequency mask is ON
v17.7 hint on    3354/2  *  --- CALL3.TXT >25000 records frequency mask is ON

for decoding attempts=3:
v16.4 hint off  3218 total
v16.6 hint off  3217 total
          correct/ false decodes
v16.7 hint off   3223/4
v16.8 hint off   3225/1
v16.9 hint off   3233/5
v16.9.1 hint off 3247/5
v17.0.1 hint off 3244/2
v17.1 hint off   3255/1
v17.2 hint off   3252/1
v17.3 hint off   3256/0
v17.4 hint off   3256/3
v17.5 hint off   3250/3
v17.5.2 hint off 3245/2
v17.6 hint off   3244/2 frequency mask is OFF
v17.6 hint off   3251/3 frequency mask is ON
v17.7 hint off   3252/1 frequency mask is ON

*it is not possible to confirm every hinted CQ/CQ DX decode from these
SDR audio files is correct one.
-----------------------

FTRSD weak signal decoding, -25dB SNR simulated signals, 10 signals in each file, 
200 files used for test, all signals are out of RX frequency, decoding probability:
test files: https://cloud.mail.ru/public/7SYw/BNWYg6hTJ

v16.4 hint off   17.0%
v16.6 hint off   17.4%
v16.7 hint off   16.1%
v16.8 hint off   17.1%
v16.9 hint off   16.8%
v16.9.1 hint off 16.3%
v17.0.1 hint off 16.0%
v17.1 hint off   21.1%
v17.2 hint off   21.6%
v17.3 hint off   21.4%
v17.4 hint off   23.0%  # AGCc is OFF
v17.4 hint off   21.6%  # AGCc is ON
v17.5 hint off   23.2%  # AGCc is OFF
v17.5.2 hint off 22.1%  # AGCc is OFF
v17.6 hint off   34.4%  # AGCc is OFF frequency mask is OFF
v17.6.1 hint off 32.6%  # AGCc is OFF frequency mask is OFF
v17.7 hint off   38.0%  # AGCc is OFF frequency mask is OFF
-----------------------

FTRSD weak signal decoding, -25dB SNR simulated signals, 10 signals in each file, 
200 files used for test, decoding on the QSO frequency 1000Hz, decoding probability:
test files: https://cloud.mail.ru/public/7SYw/BNWYg6hTJ

v16.8 hint off   20.0%
v16.9 hint off   24.0%
v16.9.1 hint off 24.0%
v17.0.1 hint off 27.0%
v17.1 hint off   28.0%
v17.2 hint off   28.0%
v17.3 hint off   28.0%
v17.4 hint off   29.0%  # AGCc is OFF
v17.4 hint off   28.0%  # AGCc is ON
v17.5 hint off   50.0%  # AGCc is OFF
v17.5.2 hint off 48.5%  # AGCc is OFF
v17.6 hint off   51.0%  # AGCc is OFF frequency mask is OFF
v17.6.1 hint off 48.0%  # AGCc is OFF frequency mask is OFF
v17.7 hint off   52.0%  # AGCc is OFF frequency mask is OFF
-----------------------

JT9 FANO weak signal decoding, -28dB SNR simulated signals, 1 signal in each file, 
500 files used for test, decoding on the QSO RX frequency 2750Hz, decoding probability
test files: https://cloud.mail.ru/public/Aabm/mis4SyF7z

v17.6.1  8.6%
v17.7   10.6%
v17.7   12.2%  'decode again' using Decode button
-----------------------

Per pass decoding statistics, number of decodes, audio files with more than 20 signals 
in the file, hint off:

v16.1, number of decodes:
pass 1 subpass 1    2502  80%
pass 1 subpass 2     152   5%
---
pass 1 total        2654  85%
pass 2               364  11%
pass 3                95   3%
pass 4                34   1%
__________________________________

Upgrade from JTDX v16.x to JTDX v17.x:
JTDX.INI file being stored in different path from WSJT-X.INI file. 
CALL3.TXT and wsjtx_log.adi files shall be copied from old to new directory (File -> Open log directory) 
if upgrade from JTDX v16.x version to JTDX v17.x version is performed. 

Upgrade from  JTDX v17.x versions to JTDX v17.7 and backwards: 
JTDX.INI file has different structure, it is recommended to delete old JTDX.INI
Also it is recommended to use latest version of the CALL3.TXT file, this file is supplied with
the software package. 

Detailed instructions on how to delete JTDX.INI file are published there: 
http://www.qrz.lt/ly3bg/JTDX/info/instal.html#notes
  
__________________________________


Recommended settings:

- JT65+JT9 combined mode
- AGCc button: use it only if AGC being triggered in receiver by JT signals at beginning of the RX interval.
  Noise level change in the waterfall might be used as criterion showing that AGC is triggered in the receiver. 
- Hint button: use it to decode signals on the QSO frequency and for wideband hinted decoding of the CQ messages
- Clean DX, use it to clean DX Call DX Grid windows if data there is not required, this way user
  could avoid some false hinted decodes  

Advanced settings tab:

- Number of decoding attempts: set it as per required decoding time. It might be set to 1 if CPU frequency is 2GHz,
  and set to 3 if CPU frequency is equal to 3GHz. Higher values make better decoding performance.

- Number of decoding passes = 4 (may be set to 3 or 2 for CPU frequency less than 2GHz if decoding attempts=1 is 
  not enough to get into 10 second decoding time). For VHF usage optimal number of decoding passes = 2, and number
  of decoding attempts may be increased to improve decoding efficiency.

- RX frequency decoding attempts: set it to 1 for slow CPU, 2 for fast CPU. Value 3 may be used for 8+ core CPUs.

- Hinted decoding DT range = 1

- use frequency mask decoding: frequency mask being derived from the first decoding pass.
  Frequency mask decoding is enabled in the code by default, depending on number of the signals on the band 
  software making decision to turn it OFF (software does recognize band conditions and frequency mask decoding 
  can be automatically turned off if there are too many signals on the band). New setting in the Advanced tab 
  does prohibit turning frequency mask decoding passes OFF, it makes some benefit for overloaded band scenario 
  and shall be used if user has fast CPU.

Frequency range on the waterfall: set waterfall window size to the frequency range you wish to be decoded.
Bins/Pixel settings would let user to choose suitable waterfall window size. Any signal located outside of the 
watefall graph WILL NOT be decoded. 

To get proper hinted decoding and FTSRD false decodes filtering operation CALL3.TXT file shall be 
copied to the JTDX log directory (from JTDX software do  File -> Open log directory). 

JTDX software is making some false FTRSD and hinted decodes.
Any hinted decode marked by asterisk and FTRSD decodes marked by questionmark, being blocked for sending 
to the pskreporter.info server, but may be reported by JTAlert software to the hamspots.net server.  

Warning: high number of decoding attempts setting and SWL mode take high CPU utilisation for prolonged time, 
causing greater power consumption and increased power dissipation/CPU cooling requirements. 


