Spectrum 1087.7-1092.3 MHz had been allocated to global flight tracking civil aviation. Automatic Dependent Surveillance Broadcast (ADS-B) is an aircraft technology to broadcast information such as latitude, longitude, altitude, velocity, and also the aircraft identity to the satellite using mode S transponder with 1090 MHz center frequency. By using that frequency carrier, there is opportunity that makes Voice Cockpit Recording (VCR) enable to be sent in semi real time to the satellite. However, an optimal data compression is necessary before sending the data of VCR. This paper develops the simulation of speech compression for VCR by using Discrete Wavelet Transform-based techniques, i.e. Daubechies12, Symlet8, Coiflet5, and Biorthogonal2.6. Subsequently, the compressed voice is transmitted in ADS-B frequency on 4.6 MHz. The voice quality as the resulted transmission is evaluated by using Mean Operation Score (MOS). The simulation results show that the wavelet method of Daubechies12 is giving the best performance of compression ratio and MOS.