This is a new system monostatic sodar (PC-MTSodar), based entirely on personal computer, capable of handling up to four antennas simultaneously, each operating at a different frequency. The system is versatile enough to function as sodar (low frequency) or Minisodar (high frequency) and minimizing external electronics makes it suitable for use in adverse environmental conditions. The system processing capabilities on-line and off-line and the signal from each antenna is digitized, filtered, decimated and analyzed separately on getting a 16-bit dynamic range of over 96 dB. The PC-MTSodar is able to detect wind speed profiles at high spatial and temporal resolution and this can be useful to analyze in detail the phenomena related to the dynamics of the boundary layer. The PC-MTSodar is formed by three antennas, one of which is oriented vertically, while the other two are tilted 22 degrees from the vertical. Each antenna is placed within vertices of a right triangle whose sides are about 30m each. The natenne beeps equal in length to each other 0.5s simultaneous frequency: 3350Hz, 3850Hz and 4350Hz with a repetition interval of 2 s. In this configuration the minimum sampling is equal to 21 m above the ground level with a spatial definition equal to 15m