Earl Robert Fredrich

US Patent:

48128252, Mar 14, 1989

Filed:

Feb 10, 1987

Appl. No.:

7/013037

Inventors:

Richard E. Kennedy - Mt. Vernon MO
Earl R. Fredrich - Boonville MO

Assignee:

K Electronics, Inc. - Pierce City MO

International Classification:

G08B 2100

US Classification:

340601

Abstract:

A tornado warning system uses a superhetrodyne receiver to detect electromagnetic energy produced by a tornado. The automatic gain control signal of the receiver is used to generate an intermediate signal having a time duration corresponding to the time when the automatic gain control is at or above a predetermined level. The intermediate signal is of constant amplitude and is integrated. Upon the integration reaching a predetermined level, an alarm initiate signal is produced which turns on an alarm drive and, in turn, sounds an alarm.