At 10:31 AM 3/28/2008, Jim Lux wrote:
>Nathaniel Lee wrote:
> > This is probably cheaper than mechanically rotating a rhombic!
>Wasn't it Jansky who had the rotating array on railroad tracks?
Yes, it was Karl Jansky (discover of radio noise from the cosmos),
although Jansky's array rotated on tires from a Ford Model-T in a
wooden track. It was comparatively lightweight consisting mostly of a
wood frame that was only about 20 feet tall (although 100 feet across)
The antenna itself was an 8-element Bruce array plus reflector for
20.5 MHz. At the time (1930), it was the largest steerable antenna in
Janksy's colleague at Bell Labs, Edmond Bruce, not only invented the
array that is named after him but the rhombic as well.
Michael Keane K1MK
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