Radio Navigation Flashcards
In relation to radio waves - the number of crests that go past in a second are known as …..
Frequency is measured in …..
kHz = how many waves in a second …..
in the thousands
MHz = how many per second …..
VHF radio waves are very ….. and travel through space in ….. …..
very energetic and travel through space in straight lines
VHF transimissions are often referred to as …..
line of sight transmissions
Most of the energy in a VHF transmission goes out through the …..
VLF transmissiond tend to send out most of their energy into ….
the ground and flow through the earth as groundwaves
If a signal needs to travel great distances and follow the curvature of the earth what is best …..
If high quality is required then …… is used
VHF, UHF or SHF
LF transmission have a ….. groundwave but a ….. skywave
strong groundwave and a weak skywave
The NDB uses a …..
NDB’s operate in a frequency band of ….. to …..
200 to 400 khz
Because the NDB uses LF its range is …..
not limited by LoS
Rated coverage of NDB’s can be from ….. to …..
30nm to 500nm
Carful of the ….. ….. stations when identifing a NDB
commercial AM broadcast
Sometimes the ….. can interfere with the proper function of the …..
skywave can interfere with the proper function of the ADF
Rated coverage of an NDB can be found in the …..
Night Effect -
The NDB sky waves can reflect off the ionosphere causing the signal to arrive later than the groundwave at the ADF causing interference
Co-channel interference -
caused by other transmitters in the area transmitting on or adjacent frequencies