Aerials And Transmission Lines Flashcards
1
Q
Identify the characteristics of a twin wire feeder
A
Balanced
Bulky and rigid
Practical upper limit is about 100MHz
Must be kept clear of the ground
2
Q
Identify the characteristics of a co-axial
A
Unbalanced
flexible
High power losses
Screened cables
3
Q
What is the definition of a balanced line
A
The conductors have the same impedance to earth
4
Q
What is the definition of an unbalanced line
A
The conductors have different impedances to the earth
5
Q
Describe a non-resonant transmission line
A
All energy is transferred from transmitter to load
Zs=Z0=ZL
6
Q
Describe a resonant transmission line
A
Some energy is reflected back to transmitter
7
Q
Identify one reason why a high voltage standing wave ratio is undesirable
A
The power radiated from the aerial is reduced
