At the ARRL’s request in the summer of 1923, the Bureau of Standards announced that it would begin a schedule of broadcasts on precise wavelengths so that amateurs could calibrate their wave meters and receivers.1 The Bureau’s station in Washington, D.C., ran a highly stable oscillator driving a one-kilowatt power amplifier and had a proven record of being heard over a wide area, even on the West Coast. In print its call sign, WWV, evokes the graphical visualization of a … Continue reading