Yagi efficiency - RadioBanter

September 26th 06, 08:24 PM posted to rec.radio.amateur.antenna

Harold E. Johnson Harold E. Johnson is offline

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Posts: 154

Yagi efficiency

"Harold E. Johnson" wrote in message news:...

Does anyone know why the efficiency of the Stanford Big Dish (150 feet)
is only 35% on 1420MHz, compared to 55% on 150 and 400MHz?

http://www-star.stanford.edu/rsg/bigdish.php

--Zack Lau W1VT

More than likely, mesh in the reflector is too big and parabolic
perfection is poorer at the higher frequency

W4ZCB

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