1-19. 110-cps Oscillatcor and Amplifier
U.
The 110-CPS oscillator Q22 supplies two
separate phases of 110-cps signals for the
110-cps synchronous filter ( para 117) and
for using the control unit loop switch to man-
ually rotate the receiver in loop mode (para
1-18). The 110-CPS amplifier Q23 provides
single-phase, 110-CPS voltage for energizing
the reference phase winding of resolver servo
motor B5 (fig. 5-9).
Hartley oscillator. The feedback necessary to
sustain oscillation is established from collector
to base through impedance network L32, C151,
and C153. The grounded center-tapped in-
ductor L32 provides a 180-degree phase shift
in collector output signal at the 110-CPS
resonant frequency established by the parallel
resonant tuned circuit of L32, C151, and C153.
The 110-cps signal fed back to the base of
Q22 through C9 and L24 is of the proper phase
to cause oscillation. The 110-CPS oscillator op-
mode, rear switch wafer S1-K removes emitter
and base bias voltages. The 110-cps collector
output signal of Q22 is amplified by 110-cps
amplifier Q23 to supply sufficient current for
Change 5 1-19
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