TM 11-5821-284-34
Figure 2-8. Servo motor and motor control logic, simplified schematic diagram.
base of Q15. Transistor Q15 conducts supplying a logic
the ferrite core produces a small variable series
"O" to CR19 and causing the coupler to tune toward
thereby increasing the resonant frequency of the
2-15.
Power Sources Analysis
(Fo 6-2, 6-3)
The power required by the antenna is a +28-volt dc
2-14. Antenna Circuit Analysis (FO 6-2, 6-3)
source This +28-volt dc source controls three voltage
The antenna is a vertically polarized, folded monopole,
dividers for the operation of the antenna. A +5.1-volt dc
divider is used for logic functions, a +6.2-volt dc divider is
matched to the impedance of a 50-ohm transmission
used for a signal reference in the operational amplifier
line.
ARI, and a + 13.7-volt dc divider is used for gatlng
a. The antenna circuit is tuned by varying
functions.
antenna impedance with the impedance of a 50-ohm
transmission line when the antenna circuit is at
2-16.
Tuning Indicator Drive Analysis
b. A small ferrite core placed around the
The tuning indicator drive supplies square-wave output
antenna uses the magnetic field generated by L1 and L2
pulses (nearly identical to pulses supplied
to change permeability. The change in permeability of
2-10