BAUMANENTS spacecraft which was developed by Bauman Moscow State Technical University in association with Federal Unitary Enterprise NPO Mashinostroenie has on board a set of instrumentation for conducting scientific experiments including satellite modem Qualcomm GSP 1620. This experiment may be considered as continuation of research by RNIIKP on satellite TNS-01. Modem installed on BAUMANETS satellite will be operated on near-polar orbit with altitude of ~ 500 km. The following theoretical calculations were performed: Baumanets satellite s modem s antenna s zones of visibility, Doppler frequency translation. Maximum and average duration of communication windows were assessed, as well as volumes of transferred information. It is shown how equipment is positioned on panels of the spacecraft, their connection with on-board computer and control & navigation system. Necessity is explained of employment of commutating unit in wiring system. Software was written to control the modem by on-board computer, which provides capability to initiate communication as at satellite s initiative, as well as initiated by earth-based user, and allows to transfer control and telemetry data. Typical algorithms with modem commands are shown. Hardware and software went through significant amount of ground testing, which included a series of special tests. Results of such tests and implemented changes are shown. Within additional experiment which will be conducted if possible, information coming from the modem will be used to define orbit parameters of the satellite. Mathematic model of this experiment is shown, as well as algorithm of solution and results of numerical experiments.