8-B-15: TR - ATR - Circulators - Directional Couplers-1
8-15B1:
The ferrite material in a circulator is used as a(an):
Phase shifter.
Electric switch.
Saturated reactor.
Loading element.
8-15B2:
In a circular resonant cavity with flat ends, the E-field and the H-field form with specific relationships. The:
E-lines are perpendicular to the end walls.
E-lines are parallel to the top and bottom walls.
H-lines are perpendicular to the side walls.
H-lines are circular to the end walls.
8-15B3:
A ferrite circulator is most commonly used in what portion of a RADAR system?
The duplexer.
The antenna.
The modulator.
The receiver.
8-15B4:
A circulator provides what function in the RF section of a RADAR system?
It replaces the TR cell and functions as a duplexer.
It cools the magnetron by forcing a flow of circulating air.
It permits tests to be made to the thyristors while in use.
It transmits antenna position to the indicator during operation.
8-15B5:
A directional coupler has an attenuation of -30 db. A measurement of 100 milliwatts at the coupler indicates the power of the line is:
100 watts.
10 watts.
1,000 watts.
10,000 watts.
8-15B6:
What is the purpose or function of the RADAR duplexer/circulator?
An electronic switch that allows the use of one antenna for both transmission and reception.
A coupling device that is used in the transition from a rectangular waveguide to a circular waveguide.
A modified length of waveguide used to sample a portion of the transmitted energy for testing purposes.
A dual section coupling device that allows the use of a magnetron as a transmitter.
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