Key Topic 65: Frequency and Bandwidth

Question 1

3-65J1: A vertical 1/4 wave antenna receives signals:

A. In the microwave band.
B. In one vertical direction.
C. In on horizontal direction.
D. Equally from all horizontal directions.

Answer 1

D. Equally from all horizontal directions.

Question 2

3-65J2: The resonant frequency of a Hertz antenna can be lowered by:

A. Lowering the frequency of the transmitter.
B. Placing an inductance in series with the antenna.
C. Placing a condenser in series with the antenna.
D. Placing a resistor in series with the antenna.

Answer 2

B. Placing an inductance in series with the antenna.

Question 3

3-65J3: An excited 1/2 wavelength antenna produces:

A. Residual fields.
B. An electro-magnetic field only.
C. Both electro-magnetic and electro-static fields.
D. An electro-flux field sometimes.

Answer 3

C. Both electro-magnetic and electro-static fields.

Question 4

3-65J4: To increase the resonant frequency of a 1/4 wavelength antenna:

A. Add a capacitor in series.
B. Lower capacitor value.
C. Cut antenna.
D. Add an inductor.

Answer 4

A. Add a capacitor in series.

Question 5

3-65J5: What happens to the bandwidth of an antenna as it is shortened through the use of loading coils?

A. It is increased.
B. It is decreased.
C. No change occurs.
D. It becomes flat.

Answer 5

B. It is decreased.

Question 6

3-65J6: To lengthen an antenna electrically, add a:

A. Coil.
B. Resistor.
C. Battery.
D. Conduit.

Answer 6

A. Coil.