ADF

A radio beacon has an operational range of 10 NM. By what factor should the transmitter power be increased in order to achieve an operational range of 20 NM?

• ASix.
• BEight.
• CTwo.
• DFour.

Night Effect’ which causes loss of signal and fading, resulting in bearing errors from NDB transmission, is due to:

• ASky wave distortion of the null position and is maximum at dawn and dusk.
• BInterference from other transmissions and is maximum at dusk when east of the NDB.
• CStatic activity increasing at night particularly in the lower frequency band.
• DThe effect of the Aurora Borealis.

Quadrantal errors associated with aircraft Automatic Direction Finding (ADF) equipment are caused by:

• ASky wave/ground wave contamination.
• BSignal bending by the aircraft metallic surfaces.
• CSignal bending caused by electrical interference from aircraft wiring.
• DMisalignment of the loop aerial.