F023 TAv 23 - Radar EO23.02

True or False:

Conventional components such as transistor amplifiers are effected by radiation losses when dealing with frequencies above 3 GHz

• True

• False

The 'Lecher Bar' is an RF transmission line that behaves like a parallel tuned circuit at a distance ________ from the termination.

True or False:

The frequency of a Resonant Cavity is dependent upon the size, as such it has a very wide bandwidth.

• False

• True

Select all the shapes below that are used to form resonant cavities

• Cylindrical

• Rectangular

• Rhumbatron

• Pyramidal

• Spherical

Resonant Cavity Coupling can be achieved using Loop Coupling which interacts with:

• the H (magnetic) field

• the E (electric) field

• the Wall Currents

True or False:

Radar Frequency amplifiers and oscillators rely on velocity modulation.

Velocity modulation varies the velocity of electrons that make up the current in the device, rather than their numbers.

• True

• False

Which of these characteristics are not associated with a Cavity Magnetron.

• uses an odd number of resonant cavities

• has a narrow bandwidth

• it is a high power RF oscillator

• Very noisy internally

In the diagram of a local oscillator what component is being represented by label B?

• Varactor Diode

• Gunn Diode

• Zener Diode

• Variable Capacitor

Select all the amplifiers from the components below

• Travelling Wave Tube

• Klystron

• Magnetron

• Gunn Diode Tuned Cavity

• Lecher Bar

Why would a dented waveguide require replacement?

• Waveguides rely on their dimension to propagate certain frequencies

• the dent will cause a change in the operating frequency

• the dent will cause an internal pressure increase damaging the connecting components

• the dent will allow transition power to radiate from the waveguide