FUNCTIONING OF EQUIPMENT
to the heading selector through the voltage adjust
a. Stepdown t r a n s f o r m e r T3 converts the
d. Potentiometer R3 is used to set the desired
115Vac, 400Hz input power to 26Vac, 400 Hz.
voltage level for a selected heading of 30 degrees.
This 26Vac, 400Hz signal is used to excite the
The 0-degree voltage level is set by potentiometer
f u n c t i o n a l block diagram and figure 3-2 for
e. Heading selector switch S3 applies 0- and 30-
schematic diagram of the TS-2644/ ASN.
degree voltages to the voltage divider circuit
The input power frequency doubling circuit
comprised of transformer T1, diodes CR1 and
CR2, capacitors C1, C2, and C3, and resistor R1.
six voltage inputs into a three-wire simulated
The circuit arrangement of T1, CR1, and CR2
magnetic heading output.
converts the 400Hz input to a 800Hz squarewave.
g. Mode selector switch S2 provides either an
The 800Hz squarewave is changed to a sinusoidal
open or a short between 7P1-E and -P. An open
wave by R1, C1, C2, and C3, then applied to
circuit between 7P1-E and -P represents the DG
mode. A closed circuit between 7P1-E and -P
represents the MAG mode.
25Vac 800Hz output of the input power frequency
doubler to 12.5Vac. The 12.5Vac power is applied
(Located in back of manual.)