. Airborne radar. Airplanes; Guided missiles. V, / for Two Modes of Oscillation Desired Operating Point V, I for Hard - Tube Modulator >-V, / for Line • Type Modulator 11-1] THE MAGNETRON 587 As was illustrated in Fig. 11-11, the position of the current-voltage relations of a mode depend upon the load impedance. The undesired modes are at frequencies different from the desired mode. The imped- ance presented to the magnetron at those other frequencies may there- fore determine in part whether the magnetron will operate stably in the desired mode. Changes of modes may occur in two different
. Airborne radar. Airplanes; Guided missiles. V, / for Two Modes of Oscillation Desired Operating Point V, I for Hard - Tube Modulator >-V, / for Line • Type Modulator 11-1] THE MAGNETRON 587 As was illustrated in Fig. 11-11, the position of the current-voltage relations of a mode depend upon the load impedance. The undesired modes are at frequencies different from the desired mode. The imped- ance presented to the magnetron at those other frequencies may there- fore determine in part whether the magnetron will operate stably in the desired mode. Changes of modes may occur in two different ways. In one form the shift from one mode to the other occurs during the pulse. This is known as a mode shift. In the other form the frequency is stable during an individual pulse, but may shift back and forth between modes in a random fashion from one pulse to the next. This is known as a mode skip. The two forms of instability may occur in combination. The mode skip is the more common form. With a mode skip the voltage pulses and current pulses appear as in Fig. 11-13. With a mode shift, the voltage and current are as in Fig. 11-14. Either of these phenomena presents a problem to the magnetron and system designer that requires careful attention to detail to solve. Fig. 11-12 Voltage-Current Character- istic of Two Modes of Oscillation in a Magnetron, and the Characteristic Curves of Two Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Povejsil, Donald J. Princeton, N. J. , Van Nostrand
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Keywords: ., bookcentury1900, bookcollectionbiodiversit, booksubjectairplanes
