RF

Sit. Rep. #74: Electromagnetic radiation.

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1- Light is part of the electromagnetic spectrum.  Also called electromagnetic radiation.  In Ham Radio we call it RF – short for Radio Frequency.  The electromagnetic spectrum is broadly divided into 7 different parts depending on the wavelength of the radiation.   Remember that the frequency and the wave length are directly but inversely related.   So … Read more

Sit. Rep. #68: Dr. Parker and Some Camping tips

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1- Maybe you have heard of the Parker Solar Probe.  It is a spacecraft launched by NASA on 12 August, 2018.  Earlier this week it approached the Sun on it’s 5th close encounter.  The perihelion of this approach put the craft at 11.6 million miles (18,668,390 km) from Sol’s surface.  It was traveling about 244,225 … Read more

Sit. Rep. #4: Take A Space Walk

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Hi, Welcome all. 1- I am going to quote Scott Kelly, American engineer, retired astronaut, and U.S. Navy captain. A veteran of four space flights. His Letter to the Editor at the NY Times is insightful. (partial quote)      “Here are a few tips on living in isolation, from someone who has been there. Follow … Read more