Method and apparatus for determining and directly measuring the

Details Method and apparatus for determining and directly measuring the Method and apparatus for determining and directly measuring the

1983-11-07

1986-04-22

Gruber, Felix D.

Boots, shoes, and leggings

324 57R, 324 58R, 364482, 455115, G01R 2706, G06J 100

Patent

active

045846502

ABSTRACT:
A system for determining the magnitude or value of the VSWR of an RF transmission system is disclosed. A VSWR value is preselected, and the ratio of reflected voltage to forward voltage for the system for a preselected VSWR is determined. The ratio is multiplied by the absolute value of the measured instantaneous forward RF voltage, giving a predicted value for the actual reflected voltage. The reflected voltage is measured, and the predicted and actual values are compared. The actual VSWR bears the same relationship to the predetermined VSWR that the actual reflected voltage bears to the predicted reflected voltage. To determine the actual value of the VSWR, a counter which contains the preselected VSWR value is incremented or decremented as a result of the comparison until the difference changes sign. The predetermined VSWR employed for the final comparison, which value is still stored in the counter, is sent to the display circuit, as the actual VSWR. Various apparatus means, such as a microprocessor, digital-to-analog multiplying converter, and analog sensors are also disclosed.

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