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2016-E9H: Receiving Antennas: radio direction finding antennas; Beverage Antennas; specialized receiving antennas; longwire receiving antennas

2016-E9H01: When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?

It should be one or more wavelengths long

Its overall length must not exceed 1/4 wavelength

It must be mounted more than 1 wavelength above ground

It should be configured as a four-sided loop

2016-E9H02: Which is generally true for low band (160 meter and 80 meter) receiving antennas?

Atmospheric noise is so high that gain over a dipole is not important

They must be erected at least 1/2 wavelength above the ground to attain good directivity

Low loss coax transmission line is essential for good performance

All of these choices are correct

2016-E9H04: What is an advantage of using a shielded loop antenna for direction finding?

It is electro statically balanced against ground, giving better nulls

It automatically cancels ignition noise in mobile installations

It eliminates tracking errors caused by strong out-of-band signals

It allows stations to communicate without giving away their position

2016-E9H05: What is the main drawback of a wire-loop antenna for direction finding?

It has a bidirectional pattern

It is non-rotatable

It receives equally well in all directions

It is practical for use only on VHF bands

2016-E9H06: What is the triangulation method of direction finding?

Antenna headings from several different receiving locations are used to locate the signal source

The geometric angles of sky waves from the source are used to determine its position

A fixed receiving station plots three headings to the signal source

A fixed receiving station uses three different antennas to plot the location of the signal source

2016-E9H07: Why is it advisable to use an RF attenuator on a receiver being used for direction finding?

It prevents receiver overload which could make it difficult to determine peaks or nulls

It narrows the bandwidth of the received signal to improve signal to noise ratio

It compensates for the effects of an isotropic antenna, thereby improving directivity

It reduces loss of received signals caused by antenna pattern nulls, thereby increasing sensitivity

2016-E9H08: What is the function of a sense antenna?

It modifies the pattern of a DF antenna array to provide a null in one direction

It increases the sensitivity of a DF antenna array

It allows DF antennas to receive signals at different vertical angles

It provides diversity reception that cancels multipath signals

2016-E9H09: Which of the following describes the construction of a receiving loop antenna?

One or more turns of wire wound in the shape of a large open coil

A large circularly polarized antenna

A small coil of wire tightly wound around a toroidal ferrite core

A vertical antenna coupled to a feed line through an inductive loop of wire

2016-E9H10: How can the output voltage of a multiple turn receiving loop antenna be increased?

By increasing either the number of wire turns in the loop or the area of the loop structure or both

By reducing the permeability of the loop shield

By increasing the number of wire turns in the loop and reducing the area of the loop structure

By winding adjacent turns in opposing directions

2016-E9H11: What characteristic of a cardioid pattern antenna is useful for direction finding?

A very sharp single null

A very sharp peak

Broad band response

High-radiation angle

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2016-E9G: The Smith chart
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