My callsign and antenna
TF3SG
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Archive for August 25th, 2008
Quarter wave vertical antenna close to the ocean
Recent testing of my new vertical quarter wave antenna on 80m. The QTH Hlidsnes Álftanesi is a perfect place to place an antenna. The antenna is 20m in hight and with 4 to 5 elevated radials about 1m above the ground. The feedpoint impedance varies with the number of radials. The radiation resistance was close to [...]
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The sands of time are running out for the central star of this the Hourglass Nebula. With its nuclear fuel exhausted, this brief, spectacular, closing phase of a sun-like star's life occurs as its outer layers are ejected and its core becomes a cooling, fading white dwarf. In 1995, astronomers used the Hubble Space Telescope to make a series of images of planetary nebulae, including the one above. Here, delicate rings of colorful glowing gas (nitrogen-red, hydrogen-green, and oxygen-blue) outline the tenuous walls of the 'hourglass.' The unprecedented sharpness of Hubble's images revealed surprising details of the nebula ejection process and may resolve the outstanding mystery of the variety of complex shapes and symmetries of planetary nebulae. Image Credit: NASA, WFPC2, HST, R. Sahai and J. Trauger (JPL)
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