3.
Assume that a radar set is designed to use a flexible coaxial cable
with 4 characteristic impedance of 100 ohms and length of 10 meters to
couple the RF energy from the transmitter to the antenna. If only 5
meters of the cable are used when installing the radar set, the
characteristic impedance of the flexible cable will be
a.
50 ohms.
b.
100 ohms.
c.
200 ohms.
d.
400 ohms.
4.
Assume that a coaxial transmission line is being used to transfer the
RF output of a radar transmitter to the radar antenna. Maximum power
will be transferred from the magnetron to the antenna when the
a.
coaxial line is terminated in a short circuit.
b.
standing wave ratio of the transmission line is greater than one.
c.
characteristic impedance of the transmission line matches the
impedance of the magnetron and antenna.
d.
impedances of the magnetron and the antenna are less than the
characteristic impedance of the transmission line.
5.
Assume that a parallel-wire transmission line has been connected to an
antenna having a resistive input impedance of 600 ohms.
If the
characteristic impedance of the transmission line is 500 ohms, what is
the standing wave ratio of the voltage?
a.
0.5/1.
b.
1.00/1.
c.
1.20/1.
d.
1.83/1.
50
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