The cam isĪttached to the capacitor shaft and rotates as the Self-generated current provides electric braking.Ī cam-operated switch is mounted on the end Rotor generates a current in the windings. Starts quickly, and when power is removed, the Rotated by an "Alnico" type motor, B101 (2) aįixed capacitor, C122 and (3) a motor capacitor,Ĭ126, and resistor, R115, which are associated The sweep-frequency modulator (figure 8-2)Ĭontains (1) a variable capacitor, C115, which is Grounded to protect it from the high energy in the During transmission of the signal impulse, the receiver is disconnected from the projector, and its input is Is not delivering power the keying relay connects Projector (filter junction box) to the transmitterĭuring its period of operation. The master oscillator, the keying relay connects the In addition to removing the blocking bias from Keying relay K105 isĬontrolled from the keying unit located in the Simplified diagram of transmitter and output circuit.Ĭut-off bias of the class-C power-amplifier tubes,Īllowing them to conduct. The master oscillator is sufficient to overcome theįigure 8-1. Short-circuits the master oscillator bias supply, Keying is accomplishedīy means of relay K105. The master oscillator tube is biased below theĬut-off point, and normally the power-amplifier Output circuit is the selection of the proper capacitors in the filter junction box for the particular Projector and the leakage reactance of the output The fixed capacitors of the filter junction box tune out the inductive reactance of the Secondary circuit is fixed-tuned and couples energyįrom the power amplifier to the projector, throughĬontacts of keying relay K105 and the filter junction box. Z102, in the plate leads of the output tubes, serveĪs parasitic suppressors. The resistance-choke combinations, Z101 and Of pentode amplifiers results in an economical tubeĬomplement because of low-drive requirements. Minimizes the induction field that might otherwiseĬause interference with other services. Type, which with adequate external shielding, The transformer, T102, is of the closed-core T102, which operates efficiently over the tuning Stage, V102 and V103, is coupled to the projectorīy means of a special high-frequency transformer, The master oscillator, V101, is capacity-coupled Switch S802, located on the control console, also The tuning circuit by switch 5107, which energizes Oscillator frequency to provide a more easilyĪ motor-driven variable capacitor, C115, is substituted for C122 in order to accomplish this Operating conditions it is desirable to "sweep" the With capacitors C101, C102, C103, and C122,ĭetermines the output frequency. Tuning is accomplished by the tank coil variometer, L101. Is capable of delivering 400 watts of power at theįrequency determined by the oscillator, which
The circuit of the QGB transmission systemĬomprises a master oscillator and a push-pull In all directions is equal to the power radiated byĪ searchlight type of equipment along its selected Transmission is used to deliver the necessary highĮnergy required to ensure that the power radiated In scanning systems a peak-power method of An example of this system is the model QGB. In these equipments a master oscillatorĪssociated with the transmitter develops the signalĪt the frequency used in transmission. In some of the older searchlight equipments thatĪre still in use the unicontrol oscillator system is This signal is amplified to the desired power level Transmitted is generated in the unicontrol oscillator system at the desired frequency and thenĭelivered to the input of the intermediate powerĪmplifier of the transmitter. In sonars of recent design, the signal to be The transmitters used in sonar are conventionalĪmplifiers operating in the low radio-frequency
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