Citation
Abstract
The extension of the 26-meter antenna to 34-meter diameter decreased the F/D ratio. This F/D change resulted in unacceptable gain losses due to the hyperboloid’s lateral deflections. A three-direction translating mounting device was added to the hyperboloid. This device was controlled by a microprocessor to minimize the offsets of the phase centers in the cassegrain RF system and also compensated for boresight directions. This article discusses the use of the Radiation Program to predict the gain losses from displacements computed by a structural computing program using an analytical model of the 34-meter reflector structure. Field test results showed accurate predictions for the Y and Z hyperboloid translations. In the X-direction, the prediction value was low. However, the computed gain losses vs primary foci offsets by the radiation program were verified by field tests.
Details
- Volume
- 42-62
- Published
- April 15, 1981
- Pages
- 112–120
- File Size
- 433.8 KB