B-006-01: Feed line characteristics, characteristic impedance
B-006-01-01:
What connects your transceiver to your antenna?
A feed line
The power cord
A ground wire
A dummy load
B-006-01-02:
The characteristic impedance of a transmission line is determined by the:
physical dimensions and relative positions of the conductors
length of the line
frequency at which the line is operated
load placed on the line
B-006-01-03:
The characteristic impedance of a 20 metre piece of transmission line is 52 ohms. If 10 metres were cut off, the impedance would be:
52 ohms
26 ohms
39 ohms
13 ohms
B-006-01-04:
The impedance of a coaxial line:
can be the same for different diameter line
changes with the frequency of the energy it carries
is correct for only one size of line
is greater for larger diameter line
B-006-01-05:
What commonly available antenna feed line can be buried directly in the ground for some distance without adverse effects?
coaxial cable
300 ohm twin-lead
600 ohm open-wire
75 ohm twin-lead
B-006-01-06:
The characteristic impedance of a transmission line is:
equal to the pure resistance which, if connected to the end of the line, will absorb all the power arriving along it
the impedance of a section of the line one wavelength long
the dynamic impedance of the line at the operating frequency
the ratio of the power supplied to the line to the power delivered to the termination
B-006-01-07:
A transmission line differs from an ordinary circuit or network in communications or signaling devices in one very important way. That important aspect is:
propagation delay
capacitive reactance
inductive reactance
resistance
B-006-01-08:
The characteristic impedance of a parallel wire transmission line does not depend on the:
velocity of energy on the line
radius of the conductors
centre to centre distance between conductors
dielectric
B-006-01-09:
Any length of transmission line may be made to appear as an infinitely long line by:
terminating the line in its characteristic impedance
leaving the line open at the end
shorting the line at the end
increasing the standing wave ratio above unity
B-006-01-10:
What factors determine the characteristic impedance of a parallel-conductor antenna feed line?
The distance between the centres of the conductors and the radius of the conductors
The distance between the centres of the conductors and the length of the line
The radius of the conductors and the frequency of the signal
The frequency of the signal and the length of the line
B-006-01-11:
What factors determine the characteristic impedance of a coaxial antenna feed line?
The ratio of the diameter of the inner conductor to the diameter of the braid
The diameter of the braid and the length of the line
The diameter of the braid and the frequency of the signal
The frequency of the signal and the length of the line
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