Encodes audio coming in through the internal microphone input to DRM30 (Digital Radio Mondiale) signals.
(Send generated DRM signal to smartphone speaker output.)

The DRM+ Tx app is for DRM30 encoding with OPUS. The paid DRM+ Tx app encodes sound, text label and message.

The DRM+ Tx app requires a RC high pass filter audio line as well as a RF front-end module with antenna, tuner, modulator, IF mixer, AF amplifier.

If a call is received while the app is running, please remove the audio line connected to the headphone jack.