| What is meant by the term night effect" when using an aircraft's Automatic Direction Finding (ADF) equipment? Night effect refers to the fact that:" |
| A) All Non Directional Beacon (NDB) transmitters are turned-off at dusk and turned-on at dawn. |
| B) Non Directional Beacon (NDB) transmissions can bounce-off the Earth's ionosphere at night and be received at almost any direction. |
| C) An aircraft's ADF transmissions will be slowed at night due to the increased density of the Earth's atmosphere after sunset. |
| D) An aircraft's ADF antennas usually collect dew moisture after sunset which decreases their effective reception distance from an NDB transmitter. |
