(Click To Enlarge)
Azimuthal equidistant map, centered on west coast. To determine a beam heading to a desired location, extend a line from center point to edge and read degrees.
The old tube shown above is known as a spherical Audion. The Audion was invented by Lee De Forest in 1906. This particular tube is a "double wing" tungsten filament circa 1915. The Audion was the forerunner to what is now generally known as a triode. A small amount of power applied to the grid could control a larger current from the filament to the plate, allowing the Audion to both "detect" radio signals (that is, make them audible) and to provide a modest amount of amplification. This Audion is an original from that era and was personally presented to Ralph Gasparotti W7WDZ (SK) by the inventor himself, Lee De Forest. Ralph’s estate donated it to the LCARA ~ W7DG. We are proud to own such an important and influential piece of early radio history.
Founded in 1948, the Lower Columbia Amateur Radio Association Inc ~ W7DG celebrated its 60th anniversary in 2008. W7DG can often be heard on the air operating from the club building located on 5 acres at an elevation of 1000’ above the City of Longview.
Our members have been hard at work putting up a weather station lately. Please feel free to check it out and bookmark it for future use!
http://weather.w7dg.org/You can also follow our weather station on Twitter where we provide hourly weather updates.
@W7dgWeather