Figure 28. Tuning unit 3 rf amplifier and oscillator, schematic diagram.

Figure 28. Tuning unit 3 rf amplifier and oscillator, schematic diagram.

rf amplifier cathode input and plate output

44. Oscillator V402, Detailed Analysis

circuits. Oscillations are developed in the

V402 tuned path circuit which consists of

A tuned plate oscillator which employs an

c o i l L409, fixed capacitor C412, tuning

a c o r n , type 6F4 (V402), generates an rf

capacitor C413, and trimmer capacitor

frequency which is 42-mc higher than the

C 4 1 4 . Feedback from the plate (pins 3

i n p u t signal frequency. The oscillator is

and 4) to the grid (pin 5) is made through

tuned by capacitor C413, which is mechan-

capacitor C415. Resistor R406 is the grid

i c a l l y coupled to C402 and C404 in the