RST Decoder

3.3.0 for iPhone
Free
0

0 Ratings

Update Date

2026-01-23

Size

5.4 MB

Screenshots for iPhone

iPhone
RST Decoder Description
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
RST Decoder 3.3.0 Update
2026-01-23
You can call a decoder that implements the new algorithm.
More Information
Price:
Free
Version:
3.3.0
Size:
5.4 MB
Update Date:
2026-01-23
Developer:
koji kamogawa
Language:
English Japanese

Safe to Download

AppPure.com and the download link of this app are 100% safe. The download link of this app will be redirected to the official App Store site, thus the app is original and has not been modified in any way.

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3.3.0 2026-01-23
You can call a decoder that implements the new algorithm.
3.2.0 2025-12-22
The display method has been upgraded.
3.1.0 2023-12-08
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.
3.0.0 2023-05-02
Updated Admob SDK.
2.8.0 2023-02-16
I reviewed the parameter of the decoder part and improved the performance.
2.4.0 2021-11-14
Changed the space character insertion logic
2.1.1 2021-06-12
Supports input signal recording / playback function.
Fine-tuned the parameter of CW SPD/Auto mode.
1.6.0 2020-11-07
Changed the display sequence of interstitial ads.
1.5.0 2020-10-29
Ad implementation fix
1.4.1 2020-08-30
App Privacy Policy update.
1.4.0 2020-08-03
Changed the volume level for interstitial ad.
1.1.0 2020-06-26
Prevent the auto sleep process.
Detection support [AR] [BT] [VA] [AR] [SN]