F023 TAv 21 - Comms EO 21.06

Which of the following pictures shows a Flexible Microwave (Gore) Cable?

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Which of the following pictures shows a waveguide?

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True or false;

A coaxial cable is a balanced transmission line.

• False

• True

True or false;

Twin wire open feeders are suitable for transmissions with frequencies higher than 3GHz.

• False

• True

What are the typical Z_o values for manufactured transmission lines that are Open-Wire?

Which of these conditions would give the maximum power transfer from the transmission line to the load?

True or False:

If the Z_o=Z_LOAD then you would expect to see a VSWR in the region of 1:20.

• False

• True

What is VSWR?

• It is a measure of the impedance mismatch, between the load and transmission line.

• It is a measure of the frequency deviation, between the load and transmission line.

• It is a measure of the dc current variation, between the load and transmission line.

• It is a measure of the resistance difference, between the load and transmission line.

True or False:

The "polarization" of an aerial is the orientation of the electric field (E-field) of the radio wave with respect to the Earth's surface.

• True

• False

The polar diagram shows the transmission pattern of which type of Aerial?

• Vertically mounted dipole aerial

• Horizontally mounted dipole aerial

• Vertically mounted Marconi aerial

• Horizontally mounted dipole aerial with a reflector and directors