About RST Decoder
This is an App that decodes Morse code input from the microphone. It is a Morse practice App that you can use to check if you are keying the correct code. Signals with good S/N can be decoded correctly, but signals with...
This is an App that decodes Morse code input from the microphone. It is a Morse practice App that you can use to check if you are keying the correct code. Signals with good S/N can be decoded correctly, but signals with bad S/N cannot be decoded correctly. Also, the performance will be degraded for extremely slow or fast signals. Usually about 5 to 10 characters are required for speed synchronization of Morse Code. Adjust the input signal so that the peak value changes from level 6 to level 7. Make fine adjustments to each parameter according to the reception status. [Additional Functions] -In addition to the decoder using BPF, a new decoder using FFT has been added so that it can be switched according to the usage. -AFD (Auto Frequency Detector) function has been added to the decoder using BPF, and BPF can be set automatically by pressing the AFD button. -The decoder using FFT automatically follows the strongest signal in the band by AFD (Auto Frequency Detector) and AGC (Auto Gain Control). You can also hold the AFD / AGC parameters by pressing the Lock button. * There will be a time lag of about 1 to 2 seconds for AFD tracking. [Control parameters] 1. Audio Input Level 2.BPF ON/OFF 3.BPF of Center Frequency 4.BPF of Band Width 5.CW Speed Control ON/OFF 6.CW Speed Control Low, Mid1, Mid2 or High 7.Delete All Decoded Text 8.Realtime CW Signal Display 9.Input signal recording / playback function *Japanese/KANA text is not supported. [Note] Since the signal after BPF is output to the audio output, it can also be used as an AF-CW filter. [URL of this App working example video] https://youtu.be/Pwp7W4m-m34
Version History You can call a decoder that implements the new algorithm. 3.3.0 Jan 23 The display method has been upgraded. 3.2.0 12/22/2025 Added a recovery function so that the app can start even in environments without network connection. However, in that case startup will be delayed by 10 seconds. 3.1.0 12/08/2023 Updated Admob SDK. 3.0.0 05/02/2023 I reviewed the parameter of the decoder part and improved the performance. 2.8.0 02/16/2023 Fixed a screen scaling bug on iPhone mini. 2.7.0 02/10/2023 Adjusted the screen size. 2.6.0 02/05/2023 Updated info.plist file. 2.5.0 12/07/2022 Changed the space character insertion logic 2.4.0 11/14/2021 -In addition to the decoder using BPF, a new decoder using FFT has been added so that it can be switched according to the usage. -AFD (Auto Frequency Detector) function has been added to the decoder using BPF, and BPF can be set automatically by pressing the AFD button. -The decoder using FFT automatically follows the strongest signal in the band by AFD (Auto Frequency Detector) and AGC (Auto Gain Control). You can also hold the AFD / AGC parameters by pressing the Lock button. 2.3.0 11/04/2021 Supported landscape mode. 2.2.0 10/24/2021 Supports input signal recording / playback function. Fine-tuned the parameter of CW SPD/Auto mode. 2.1.1 06/12/2021 Fine-tuned the parameter of CW SPD/Auto mode. 2.0.0 05/16/2021 Updated the google Admob library. 1.9.0 02/23/2021 Added a real-time monitor display function for Morse code level. The GUI has been changed due to the addition of functions. 1.8.0 01/01/2021 Changed the display sequence of interstitial ads. 1.6.0 11/07/2020 Ad implementation fix 1.5.0 10/29/2020 App Privacy Policy update. 1.4.1 08/30/2020 Changed the volume level for interstitial ad. 1.4.0 08/03/2020 Bugfixed. Added the Interstitial ads. 1.3.0 08/01/2020 Fixed bug in the decoded text display area. 1.2.0 07/14/2020 Prevent the auto sleep process. Detection support [AR] [BT] [VA] [AR] [SN] 1.1.0 06/26/2020 1.0.0 06/21/2020
Previous Versions
Here you can find the changelog of RST Decoder since it was posted on our website on 2023-09-06 19:05:36.
The latest version is 3.3.0 and it was updated on 2026-06-21 02:53:42. See below the changes in each version.
RST Decoder version 3.3.0
Updated At: 2026-05-26
Changes: Version History You can call a decoder that implements the new algorithm. 3.3.0 Jan 23 The display method has been upgraded. 3.2.0 12/22/2025 Added a recovery function so that the app can start even in environments without network connection.
However, in that case startup will be delayed by 10 seconds. 3.1.0 12/08/2023 Updated Admob SDK. 3.0.0 05/02/2023 I reviewed the parameter of the decoder part and improved the performance. 2.8.0 02/16/2023 Fixed a screen scaling bug on iPhone mini. 2.7.0 02/10/2023 Adjusted the screen size. 2.6.0 02/05/2023 Updated info.plist file. 2.5.0 12/07/2022 Changed the space character insertion logic 2.4.0 11/14/2021 -In addition to the decoder using BPF, a new decoder using FFT has been added so that it can be switched according to the usage.
-AFD (Auto Frequency Detector) function has been added to the decoder using BPF, and BPF can be set automatically by pressing the AFD button.
-The decoder using FFT automatically follows the strongest signal in the band by AFD (Auto Frequency Detector) and AGC (Auto Gain Control). You can also hold the AFD / AGC parameters by pressing the Lock button. 2.3.0 11/04/2021 Supported landscape mode. 2.2.0 10/24/2021 Supports input signal recording / playback function.
Fine-tuned the parameter of CW SPD/Auto mode. 2.1.1 06/12/2021 Fine-tuned the parameter of CW SPD/Auto mode. 2.0.0 05/16/2021 Updated the google Admob library. 1.9.0 02/23/2021 Added a real-time monitor display function for Morse code level.
The GUI has been changed due to the addition of functions. 1.8.0 01/01/2021 Changed the display sequence of interstitial ads. 1.6.0 11/07/2020 Ad implementation fix 1.5.0 10/29/2020 App Privacy Policy update. 1.4.1 08/30/2020 Changed the volume level for interstitial ad. 1.4.0 08/03/2020 Bugfixed.
Added the Interstitial ads. 1.3.0 08/01/2020 Fixed bug in the decoded text display area. 1.2.0 07/14/2020 Prevent the auto sleep process.
Detection support [AR] [BT] [VA] [AR] [SN] 1.1.0 06/26/2020 1.0.0 06/21/2020
RST Decoder version 3.3.0
Updated At: 2026-01-23
Changes: You can call a decoder that implements the new algorithm.
RST Decoder version 3.1.0
Updated At: 2023-12-08
Changes: Dec 8, 2023
Version 3.1.0
Added a recovery function so that the app can start even in environments without network connection.
However, in that case startup will be delayed by 10 seconds.
RST Decoder version 3.0.0
Updated At: 2023-05-02
Changes: May 2, 2023
Version 3.0.0
Updated Admob SDK.
Disclaimer
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