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Assorted ramblings from the developer

Release: 3.0.10

Download here [Link].

What's new / changed in 3.0.10:


  • Audio device dropdown now shows a check mark next to the current device and L/R channel selection.
  • SDRplay radios – sanity check that the default frequency is valid – must be in the range 10 kHz to 2 GHz. previously a user started with the default frequency of 10Ghz which is not supported by the SDRplay library.
  • FM Stereo RDS logging was not working properly with multiple active receivers.
  • Fixed a long-standing bug in the tuning bar at the bottom of the main waterfall; this was an error which existed since the code was originally written over four years ago. A determined fool-hardy user could expose the problem and crash the program.
  • Scrolling at 8.333 kHz with rapid middle wheel spinning works properly.
  • Identity title now optionally shown in the program title bar.


  • More taps available for filters.
  • Corrected DSB filter editor.
  • Narrow FM de-emphasis redesigned to avoid audio pumping.
  • NR3 reworked. Threshold changed to Level, working much better.
  • Filters:
    • Changed appearance of the Filter design window.
    • Added more windowing options.
    • (I may add Remez design methodology later.)


  • Sorting favourites by frequency is now reliable.


  • Slight change to installer appearance, kit now has updated images.
  • In previous kits an extra folder was being created in the user folders, this extra folder was not used.


  • Applying a memory now restores the original center frequency and bandwidth if the memory frequency would not otherwise be visible.


  • Pluto visible gain range changed to -60dB to 30dB.
  • Digital filter opened up to 0.95 and the offset tuning range increased to +/- 200kHz.

    Looking at the code I was enabling the Transmit Digital Filter with a normalised bandwidth of 0.2, so at 550kHz that’s 110kHz and with 128 taps not very sharp. This is why we were seeing lower outputs with greater offsets because offset tuning means just that – tuning at an offset from the center frequency.

    SoTo test, I set the digital filter to 0.95 of normalised bandwidth and this did not change the signal(s) seen on the remote receiver (Airspy HF+ Discovery). I was testing on 144.300 and the Discovery was picking up signals 60dB above the noise.


  • Fixed a problem with audio recording of Broadcast FM when in mono, previousy a new file was created every time the mode switched between mono and stereo.
  • When the playback of a file starts the display bandwidth is set to the bandwidth of the recording. A more intelligent algorithm will be developed in 3.0.11.
  • ELAD files which are not valid WAV format are supported.
  • IQ recording now has a Range option, specify the center frequency and the bandwidth.

Ribbon Bar

  • Memory editor now supports 11 digits – frequencies up to 99.9GHz.
  • Adding a dropdown entry to the Quick Access Toolbar (QAT) now does not inhibit correct initialisation of the original dropdown. The dropdown in the QAT does not work though, this is being investigated. An example of a dropdown is Ribbon Bar, Home Bandwidth.
  • Entries added to the ribbon bar’s QAT (Quick Access Toolbar) are removed when starting if they contain dropdown entries. This is related to random crashes in the console.


  • When a new receiver is added the default frequency is no longer the center of the display, rather an unused frequency in the visible display.
  • Adding a new receiver now clones the currently active receiver. It was working this way when 3.0 was released but was broken in a previous minor update.



  • Implemented the One Euro Filter as default in the Spectrum Smoothing. This is much better than the other options, it preserves the peaks while reducing noise.
  • Fixed a slightly obscure bug only seen while scrolling the receiver frequency.


  • Added Serial Port PTT.


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