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Introduction to Radio Astronomy
www.radio-astronomy.orgThe EM Spectrum - Radio Radio signals are able to reach Earth and so many large radio observatories have been built to look at objects through this large portion of the EM spectrum. The pictures above shows the Milky Way galaxy in a 360 degree map view in both visible light (left) and radio radiation (right - 408 MHz). Remember that radio
Radio Waves and Communications Distance
www.arrl.orgFirst Steps In Radio Radio Waves and Communications Distance Part 13: It is important to choose the correct amateur band and the right time of day for communications over great distances. Other important X DON'T THINK IT'S REALLY PONE THIS SIGNAL factors in amateur communications are the time of year and the sunspot cycle.