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Klystron Automatic Frequency Circuit

IP.com Disclosure Number: IPCOM000097096D
Original Publication Date: 1962-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Pulford, SR: AUTHOR

Abstract

The operating frequency of a reflex klystron is usually varied over large frequency ranges by thermal-tuning. Such controls the resonator cavity size by means of a heater element within the tube. Also, changes in the magnitude of the negative bias voltage on the reflector effect corresponding frequency changes of a smaller degree. This offers a method for fine adjustment where the mode of operation is set previously by thermal tuning. Due principally to the considerable difference in response speeds of these two methods, special measures are required to provide a uniform control function over a wide range of frequencies, both as to static running condition or during rapid sweep.

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Klystron Automatic Frequency Circuit

The operating frequency of a reflex klystron is usually varied over large frequency ranges by thermal-tuning. Such controls the resonator cavity size by means of a heater element within the tube. Also, changes in the magnitude of the negative bias voltage on the reflector effect corresponding frequency changes of a smaller degree. This offers a method for fine adjustment where the mode of operation is set previously by thermal tuning. Due principally to the considerable difference in response speeds of these two methods, special measures are required to provide a uniform control function over a wide range of frequencies, both as to static running condition or during rapid sweep.

Incoming control signals, shown as sawtooth waves, connect through an RC lead network to a control circuit. This is composed of amplifying devices and a divider network for providing two output signals having a certain predetermined ratio. The one output is directly connected to the heater element for effecting thermal tuning and the other is fed through a lag network to the reflector.

The lag network provides a fall-off in frequency response of the reflector at higher frequencies making its performance more closely approximate that of the thermally tuned cavity. The latter, due to its inherently slower operation, has a decreased response at higher frequencies. As to the lead network, it acts to extend the frequency response generally. It also attenuat...