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    3. Version 2.80 (March 19, 2020)
      - maximum frequency increased to ~99,9 GHz
      - OmniRig v2 support (4 Rigs available)
      - OmniRig v1 support removed (update to v2 necessary!)
      - fully integrated band management (ITU 1+2+3)
      - FreqMgr: HFCC frequency list (import)
      - FreqMgr: Perseus frequency list (import)
      - FreqMgr: FindMatch consider Time, AutoFindMatch
      - FreqMgr: User banks can be renamed
      - band selection / frequency step on main window
      - Misc option: Auto-LO
      - Misc option: keep Tune when LO is changed
      - Auto Band Zoom (Options -> Visualization -> RF)
      - Mouse Wheel option "Zoom RF"
      - Forwards button for WAV files
      - WAV buttons << and >> operate without WAV file
        { left click: Band +/- } { right click: Tune +/- step }
      - auto subdirectories for recording
      - more options for digital mode application (Options -> DigiMode Settings)
      - more command line options (-lo, -tune, -mode, -rec with recording time)
      - drag and drop for wav files
      - split for TX (SDR-TX only!)
      - slow speed for AF display
      - Autosave AF waterfall {CTRL+Shift+X}
      - more frequency steps
      - new command line parameter "-collapse"
      - some bug fixes

      Extensive Changelog written by Bjarne Mjelde.


      Version 2.76a (March 17, 2018)
      - some bug fixes

      Version 2.76 (February 02, 2017)
      - switchable display mode: S-units / dBm
      - switchable mode for S-meter: RMS / Peak
      - enhanced accuracy of level indicators. New calibration required!
      - periodic and explicit level logging into .CSV file
      - switching AGC to off, sets manual gain value
      - oversteering/clipping audio does now reduce gain value - not volume
      - fixed OmniRig handling: "MuteOnTX"
      - deactivate AFC after frequency/mode changes for a small duration
      - Fast WAV file demodulation & recording
      - some new keyboard shortcuts
      - some other small improvements and fixes

      Version 2.75 (January 01, 2017)
      - more recording options
      - support for 8bit sampling format - ideal for RTLSDR, halving RF recording size
      - display level / clipping for RF and AF
      - additive noise generator for hiding aliases
      - Highpass Filter for AM/FM deactivatable - useful for slow digimodes
      - configurable gain for I/Q output - useful for digimode decoding weak signals of SDRs with >16 Bit dynamic range
      - Uniform "Calibration" dialog for Frequency/S-Meter/DC Removal/Channel Skew
      - "Custom color palette" to customize colors of Waterfall/Spectrum and some more
      - output soundcard no longer necessary (e.g. for recording or monitoring)
      - support for 8k display resolution (7680x4320)
      - some new keyboard shortcuts
      - extended ExtIO capabilities
      - experimental transmit capability through ExtIO API interface
      - many fixes and improvements

      Version 2.70 (November 01, 2013)
      - better CPU utilization
      - added Automatic Notch Filter
      - added AFC for AM and FM. AFC can be deactivated in ECSS mode
      - smoothed S-Meter display
      - enhanced parameters for 'SDR on IF output'
      - new keyboard shortcuts for Lo/HiCut and WAV files
      - 'spectrum' switchable to Autocorrelation/Cepstrum display (Click on 'Spectrum' label)
      - TX-Button for HRD(DDE) / CAT to HDSDR
      - added 'Double Size' option in Frequency Input Dialog
      - Frequency Manager now provides 5 User Banks
      - many fixes and improvements

      Version 2.63 (July 20, 2013)
      - offset for additional Converter (behind Omni-Rig controlled receiver)
      - general 'mute on TX' option for CAT/HRD(DDE)
      - fixes and improvements for 'RF front-End options'
      - microphone input is also saved in AF recording (TX)
      - some small improvements and fixes

      Version 2.62 (June 09, 2013)
      - extended range for AGC threshold
      - added more options for 'SDR on IF output'
      - full synchronization for Ham Radio Deluxe (HRD) using DDE
      - many fixes and small improvements

      Version 2.61 (March 30, 2013)
      - fixed handling of 'non standard' soundcard input sample rate
      - some other fixes

      Version 2.60 (March 24, 2013)
      - DC Removal option with adjustable bandwidth (see Options->Channel Calibration for RX)
      - renamed (existing) 'NB' to 'NB RF'
      - additional Noiseblanker 'NB IF'
      - NB, NR and other functions now on single slider in main window
      - FM bandwidth adjustable independently from HiCut (click FM button again to see slider)
      - new option: Tune fixed to 'LO <-> Tune offset'
      - Right click on RF display sets Tune frequency - by changing LO frequency - keeping LO <-> Tune offset
      - 192kHz output sampling rate allows wider IF recording
      - Output sampling rate is saved/restored for each mode
      - added output channel mode (for RX) for audio (listening) and I/Q output (digimode software)
      - improved LO frequency calibration
      - Phase clock back on "RF Frontend & Calibration" dialog (see Options)
      - extended ExtIO interface: Sampling Rate, MGC, AGC, ...
      - Sync with OmniRig also on unsupported modes
      - IF offsets per mode - now usable without OmniRig, too
      - several new visualization options:
        - RF/AF displays can be swapped or switched off
        - added compact mode - without RF+AF display (Shift+X)
        - enhanced waterfall: added TimeStamps and mouse position shows time & frequency
        - waterfall color scale just depending on spectrum range (deactivating brightness/contrast), for noise level observation
        - optimizations for Remote Desktop (RDP) usage (see Options->visualization)
      - clock display in UTC or local time (see Misc Options)
      - ECSS improved
      - fix: AF record level is no longer affected by volume slider
      - fixed Frequency Manager
      - many other fixes and improvements

      Version 2.51 (December 06, 2012)
      - some fixes and small improvements

      Version 2.50 (October 30, 2012)
      - better CPU utilization
      - better WFM (mono) workaround with 96kHz output samplerate
      - improved image rejection
      - ECSS improved
      - offset per mode (SDR on IF output)
      - CW-LSB for sync with analog radio
      - new command line option "Path\ExtIO_xyz.DLL" for ExtIO-DLL selection
      - enhanced recording scheduler
      - enhanced multi-monitor support
      - CW pitch frequency adjustable with mouseclick on pitch-text
        alternatively with mousewheel on the pitch-text
      - fixes and improvements for Omni-Rig
      - some small fixes and improvements

      Version 2.15 (July 05, 2012)
      - bugfixes for ELAD FDM-S1
      - some small fixes and improvements

      Version 2.14 (May 19, 2012)
      - option to show "Filled Spectrum"
      - FFT size up to 256k samples
      - mute RX audio on TX over "CAT to HDSDR"
      - fixes and improvements for "CAT to HDSDR"
      - fixes and improvements for Omni-Rig

      Version 2.13 (April 01, 2012)
      - CAT interface for controlling HDSDR
      - ExtIO frequency options: added support for Upconverter
      - control RX/TX (PTT) with Omni-Rig (CAT)
      - swap I/Q option is saved/restored in WAV file
      - extensions to the ExtIO DLL interface: ATT, Mute, Swap I/Q, TX, ...
      - better Wine compatibility
      - some small fixes and improvements

      Version 2.11 (November 28, 2011)
      - bugfix incorrect CW Tune frequency
      - many more bug fixes and improvements
      - support frequency control over DDE from SatPC32 and Wisp
      - DDE auto-record function

      Version 2.1 (July 23, 2011)
      - bugfix on sound card selection leading to unsupported wave format
      - bugfix on very coarse RBW (=small FFT length)
      - fixed 24 bit recording with ASIO
      - fixed writes access in hdsdr directory (for some ExtIO DLLs)
      - independent RBW and Zoom also for AF (lower) spectrum and waterfall
      - removed privilege option (WOLA processing). A Finer RBW should have same effect
      - support frequency control over DDE from WXtrack
      - return to ExtIO with preserved mode/frequecy settings after file playback
      - Frequency Manager state and size/position is saved and restored
      - some small fixes and improvements

      Version 2.0 (June 24, 2011)
      - basic transmit (TX) functionality in modes SSB, AM, FM & CW with additional soundcard
        I/Q modulated signal pair for the TX input signal (Microphone) is produced on the TX output soundcard.
      - resizable "window view" now default. new "full screen" mode switchable at runtime
      - RF spectrum and waterfall is optically zoomed to fit window
        width independently of FFT resolution bandwidth (RBW).
      - new collapse mode (Shift+C)
      - new frequency input dialog is opened by entering any digit
      - Frequency Manager:
        - independent lists for:
          - Eibi - with import / download option
          - Ham Bands, Radio Bands, User
        - sort and filter for displayed entries
      - DDE client - to let HRD (Ham Radio Deluxe) or Orbitron control the frequency (Howto)
      - ExtIO frequency options
        - ExtIO as secondary receiver with fixed IF frequency
          f.e. 10.7 MHz while controlling primary receiver with OmniRig
        - Downconverter and Undersampling Option
      - LO Frequency calibration for ExtIO
      - S-meter calibration (see Options/Misc Options)
      - more customized OmniRig options
      - configurable mouse wheel direction
      - updated keyboard shortcuts (see full list on start menu)
      - custom profiles (f.e. per receiver) using new command line option "-p profilename"
        (the profile name should not contain spaces or other local characters)

      Version 1.0 (December 23, 2010)
      - program name changed to HDSDR
      - bug fixed small screen resolution
      - fixed compatibility of WAV files
      - support for RAW file recording
      - WAV files can be directly opened using "open with" from windows explorer
      - OmniRig: Tune or LO frequency sync
      - OmniRig: bypass synchronization when shift key hold
      - notch bandwidth adjustable with mouse wheel down to 5 Hz
      - small fixes

      Version 0.81c (November 14, 2010)
      - ASIO bugfix
      - FM bugfix
      - fixed handling of large WAV files
      - more (switchable) output sampling rates
      - user defined WAV file split size
      - better CPU utilization
      - small fixes

      Version 0.81 (October 23, 2010)
      - up to 10 manual adjustable notch filters
       (click in lower spectrum to set or remove, mouse wheel to change bandwidth)
      - new FM demodulator
      - squelch (click on S-meter scale)
      - improved image rejection
      - improved bandpass for AM and FM
      - 3 recording modes: RF, IF and AF(automatic pause on squelch)
      - recording scheduler
      - support for Perseus recording format
      - support for multipart Perseus and SpectraVue wav files (playback)
      - optimized OmniRig support
      - some bug fixes and improvements

      Version 0.18 (June 25, 2010)
      - bidirectional OmniRig support
      - support for Alberto's HPSDR ExtIO (reported by Roger, Ken, ...)
      - keyboard shortcuts extended (see hdsdr_keyboard_shortcuts.htm)
      - many small bug fixes and improvements

      Version 0.152 (April 11, 2010)
      - bug fix: OmniRig support (reported by Chris)
      - new command line option "-swapsw" (swap spectrum/waterfall) (reported by Chris)
      - playback bar optimized
      - small optimization

      Version 0.151 (March 31, 2010)
      - bug fix: ExtIO_*.dll was not found in program directory [installer] (reported by Terry)
      - bug fix: mouse wheel "LO Mode" incorrect (reported by Manfred)
      - AM/ECSS bandwidth now 12 KHz (reported by Manfred)
      - Mouse wheel step 1Hz added (reported by Bertrand)

      Version 0.15 (March 27, 2010)
      - maximum frequency now 10 GHz (reported by Alexandr)
      - wav playback/record optimized
      - compatibility to SpectraVue restored (reported by Alf)
      - wav control buttons always visible/useable
      - record/playback now directory independent
      - total record size displayed
      - configurable mouse wheel steps (see <show option>)
      - "WF AVG" on/off function restored (click the AVG label! "#"= off) (reported by Patrick)
      - smaller screen resolution below 1024x576 supported (down to 640x480) (reported by Rainer)
      - Omnirig support (reported by Terry and Wolfgang)
      - 12 KHz output samplerate supported (reported by Paolo)
      - AM/ECSS output samplerate now 24KHz (reported by Paolo)
      - "AGC medium" added
      - update check
      - some small improvements

      Version 0.12x (December 22, 2009)
      - optimized WAV record/playback
        default WAV-path is now in your default document directory
        you can change the WAV Directory by clicking right the record button
        larger playback bar (reported by Alf)
      - zoom center tune frequency (reported by Alf)
      - Band selector

      Version 0.12b (December 05, 2009)
      - bug fix: ExtIO_*.dll for PMSDR and ElektorSDR crashes (reported by Alexander)

      Version 0.12 (December 02, 2009)
      - new command line option -fs (full Screen)
        full horizontal size without full HD display to the disadvantage of the spectrum size
      - new command line option -wv (window view) to show in a default window
      - ExtIO_*.dll processing error check (i.e. SDR14, reported by Terry)
      - ExtIO_*.dll GUI not automatic shown after restored from minimized (reported by Alf)
      - optimized main frequency scale
      - scrolling main frequency scale changed LO (comparable to perseus software)
      - "Channel Skew Calibration" enhanced (reported by peter)
      - privilege settings moved to option menu
      - optimized soundcard handling
      - new button to show die ExtIO_*.dll GUI manually
      - new button to show the windows start menu
      - some bug fixes and optimization

      Version 0.0.7 Build 06 (July 29, 2009)
      - real multi monitor support (new command line option "-sd" to show only on secondary display)
      - maximum LO now 999 MHz (i.e. for 2m or 70cm converter)
      - extended extreme low speed waterfall
      - upper frequency scale position now saved
      - bug fix: command line option fixed
      - bug fix: FM workaround
      - bug fix: multi-LO support
      - bug fix: soundcard management
      - Windows 7 final test pass

      Version 0.0.6 Build 08 (May 17, 2009)
      - bug fix: sometimes hang at startup
      - bug fix: upper scale trouble while moving down
      - new control elements arrangement
      - lower display double size (full HD resolution required)
      - AGC mode switch (each modulation type stores and restores its own value)
      - multi-LO support: modulation now assumed
      - multi-LO support: 2nd frequencies now stored/restored
      - extreme low speed waterfall (more than 1 day, to be dependent on screen resolution)

      Version 0.0.4 Build 07 (March 17, 2009)
      - bug fix: multi-LO crashes without ExtIO_*.dll

      Version 0.0.4 Build 06 (March 16, 2009)
      - command line options "-as" (auto start) and "-extio" (auto load ExtIO_*.dll) implemented
      - website URL and email address on about window
      - optimized control elements arrangement
      - new program icon
      - bug fix: scale SP2 unmovable
      - multi-LO support: tune frequency now assumed

      Version 0.0.3 Build 06 (March 06, 2009 - 1st public release)
      - optimized for better usage of the screen area
      - supports full HD and double full HD (i.e. multi monitor) horizontal screen resolution
      - always uses the maximum vertical resolution
      - minimum screen resolution 1024x576 (i.e. for netbooks)
      - improve FM sound (workaround)
      - multi-LO support (2 different local oscillators, unfinished)
      下分的捕鱼游戏