This is an app for amateur radio operators with a narrow band of audio frequency, spectrum scope & waterfall display.
You can get a rich display by microphone inputting the speaker output of a radio that does not have a spectrum scope or waterfall function. The FFT allows you to distinguish between the dot and dash of Morse code.
[function]
1. Ability to change the speed of the waterfall
2. Ability to adjust the level of audio input
3. Function to switch the display band between wide and narrow
4. Display pause function (pause / cancel by touching the screen)
5. Display scaling for iPhone Display size.
6. Function to switch frequency resolution.(40Hz/20Hz/10Hz)
7. Function to switch between bar graph and line graph
8. Function to switch the cross hatch ON / OFF by longTap
9. Function to switch the USB/LSB by Left/Right Swipe
10.Recording/Playback function of Input Sound
11.File Listing function
RST Scope(Free)
https://www.youtube.com/watch?v=1s9RvOFp52g