HOMEWORK. Read Jeppesen Section 9 B & C Gleim chapter 10 (33 questions 10 will be on your next quiz) ASA Chapter 10 PHAK CHAPTER 15 15-21 TO 15-35 AIM SECTION 1. ASA. You should have studied all of the following questions to date:
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The transponder works like this. The ground radar equipment sends out a special interrogation signal asking all aircraft, “Who are you?”. Only transponder equipped aircraft can answer. The airborne transponder picks up the signal and automatically sends back a strong pulsed signal in reply. The reply signal is computed into distance and direction (mode c altitude as well) by the ground station and is displayed with the aircraft’s target on the controllers scope.
Sense antenna, is a non-directional antenna that has the capability of providing directional information. Usually a long wire installed on the top of the airplane
Loop antenna, a metal ring enclosing coils of insulated wires, is usually contained within a streamlined housing mounted well forward of the underside of the fuselage. Senses magnetic bearing from the airplane to the station.
REC position or ANT selects only the non-directional or sense antenna. The loop antenna and there fore the bearing selector are disconnected from the system. In this position operates as a L/MF receiver. Used for listening only or station identification.
EXR = extended range, permitting strong reception of stations at greater distance.
BFO = Beat frequency oscillator selection provides an aural aid to tuning. It should be used only in tuning unmodulated signals, such as those broadcast by stations in some foreign countries. In North America it is not needed since modulated signals are used. In BFO the underlying morse code identifier can be heard through the audio tone of the unmodulated signal. After the station is tuned and identified, the function selector shold be repositioned to ADF
How about that switch with all the funny abbreviations?
ADF puts the unit in nav mode, uses the loop (gray box) antenna on the bottom of the aircraft and sense
ANT puts the unit in receive mode and switches to the big long antenna that goes from the top of the cabin to the tail.
BFO puts the unit in Beat Frequency Oscillator. This selection provides an aural aid to tuning. It should be used only in tuning unmodulated signals, such is in some foreign countries. The BFO allows the underlying morse code identifier to be heard through the audio tone of the unmodulated signal. After tuned you would turn back to ADF
Modulated means to change some characteristic, such as amplitured, frequency, or phase of an alternating current wave.