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Additional info for AN 08-10-209 BC-348 series Radio Receiver (maintenance)

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Notice that the further the signal is from the normal, the greater the amount of refraction. Chapter 2 Page 27 © G LONGHURST 1999 All Rights Reserved Worldwide Automatic Direction Finding FIGURE 2-17 Coastal Refraction Chapter 2 Page 28 © G LONGHURST 1999 All Rights Reserved Worldwide Automatic Direction Finding 46. To minimise coastal refraction, bearings should be taken when the aircraft is positioned such that the signal from the NDB is crossing the coast at an angle fairly close to 90°. If this is not possible an NDB should be used which is as close as possible to the coast.

The frequency selection controls enable the operator to select the frequency required by placing the appropriate numbers in the frequency window. 5 KHz frequency divisions. 25. The function switch has four positions. With ADF selected and a suitable signal present the equipment automatically gives bearing information. 26. By selecting the ANT (antenna) position the loop aerial is taken out of circuit and the audibility of A2A NDB identifiers should improve. Obviously with the ANT position selected the bearing information must be disregarded, but it is the best position for checking signal strength and identification.

QUESTION 11. When ANT is selected on the ADF function switch which aerial(s) are being used? QUESTION 12. In an ADF receiver, thunderstorm effect is caused by: QUESTION 13. Does the Beat Frequency Oscillator in ADF equipment generate an alternating current at an audio or radio frequency? Chapter 2 Page 39 © G LONGHURST 1999 All Rights Reserved Worldwide Automatic Direction Finding QUESTION 14. An NDB bearing is taken from an RBI and reads 057° relative. The heading of the aircraft is 359°(C), deviation is 3°E and magnetic variation is 7°W.

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