[CW] Fwd: The Yagi Turns 100

[John]

One of the great inventions .   Increased gain and efficiency, and the
terror of HOA's worldwide all in one!
Thank you Professor Yagi
John K5MO

On Thu, Sep 10, 2026 at 12:14 PM Radio KH6O via CW <cw at mailman.qth.net>
wrote:

>
>
> The April 1976 issue of QST had an obituary of Hidetsugu Yagi, 1886-1976:
>
> ----------------------Begin article----------------
>
> Many antenna designs bear the names of their developers, but few names
> have become so thoroughly a part of radio language as "Yagi." Perhaps the
> ultimate tribute to that man who probably was the first to use parasitic
> elements in directive arrays is that his invention is often spelled "yagi,"
> now essentially a generic term in the antenna dictionary.
>
> Professor Yagi, a quiet man who gave much of the credit for practical
> development of his ideas to his assistants, Uda and Okabe, died of heart
> complications in Tokyo, January 19, at the age of 89.
>
> Though the Yagi-Uda work with parasitic arrays was done in the early
> 1920s, it appeared to have received little notice in this country until
> 1928, when Yagi visited the US and presented papers before meetings of the
> Institute of Radio Engineers in NY, Boston, and Hartford.
>
> It may come as a surprise to modern amateur antenna experimenters to learn
> that development of parasitic arrays was only part of Professor Yagi's
> extensive research and development program, carried out on the UHFs at the
> College of Engineering of the Imperial University, Sendai, Japan in 1926
> and earlier.
>
> While Uda worked on antennas, Okabe was busy on the development of means
> for generating power at frequencies as high as 2500 MHz. The had
> split-anode magnetrons working on wavelengths from 200 cm to 12 cm, and
> much of the antenna work was done around 40 cm.
>
> The Yagi papers, 'IRE Proceedings,' June, 1928, remarkably complete and
> advanced for their time, still make interesting reading. They were given
> fulsome praise by the late Dr. J. H. Dellinger, long-time chief of the
> Radio Division of the US Bureau of Standards, himself one of America's
> distinguished pioneer radio physicists: "Never have I listened to a paper
> that I felt so sure was destined to become a classic."
>
> ----------------------End----------------------
>
> --
>
> 72 / 73 / 3579,
> Jeff KH6O / 6
>
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> =30=
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