Over the last few decades, classical optical astronomy has expanded to the entire electromagnetic spectrum. This course develops the techniques related to radio telescopes (simple radio telescopes – interferometers) – Learning the mechanisms of electromagnetic radiation emission (Thermal radiation of cosmic dust – Synchrotron – ionized gas) – the emission of the near and far space environment at radio frequencies – The physics of spectral lines from interstellar matter, the Hydrogen line, and molecules is also presented. Also presented are the components and basic technology and theory behind radio receivers, noise theory, formation of radio telescope beams, and calibration techniques. Special emphasis on interferometry techniques and presentation of radio telescope arrays that use them (Very Large Array, ALMA, Event Horizon Telescope). Theory of Fourier analysis and its applications in interferometry is also expanded upon.