PHI - Position and Homing Indicator: Difference between revisions

PHI - Position and Homing Indicator (view source)

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 The apparatus required a lot of power, about 150W, partly with 28V voltage and partly with 400 Hz alternating voltage needed to drive the various synchronous motors and related actuators.
+===Parts constituting the apparatus===
+Within various spaces within the aircraft:
+* 4-beam doppler transmitter and relative antenna positioned on the underside of the aircraft.
+* Computer unit.
+* Signal amplifier and Junction-Box.
+* Pitot tube to obtain the static and dynamic pressure without interfering with that used by the pneumatic instruments on board.
+* Gyro Compass with fluxgate magnetic sensor.
+Inside the pilot's cabin:
+* Indicator Unit normally placed in front of the pilot at the top of the cockpit.
+* Wind control unit, a device necessary to enter the wind speed and direction in order to automatically calculate the deviation due to the wind.
+* Selector unit, keypad necessary to activate the device, together with a switch / programmer of the (1 + 4) possible routes.
+* Doppler radar management unit.
+This long list of devices highlights the complexity of such an instrument which at the time cost about as much as a general aviation aircraft.