8-16B: TR/ATR/Circulators/Directional Couplers 2

Question 1

8-16B1

The ATR box:

A. Protects the receiver from strong RADAR signals.
B. Prevents the received signal from entering the transmitter.
C. Turns off the receiver when the transmitter is on.
D. All of the above.

Answer 1

ANSWER B
ATR stands for Antitransmit-Receive Tube. The ATR tube disconnects the RADAR transmitter during the period of echo receive. The ATR “box”keeps the weak echo from going the wrong way into the transmitter, rather than where it should go, to the receiver. Thust the ATR “box”is a transmitter isloator to the received signals coming from the antenna unit. If this isolation does not occur in the receiver. Conversely, the TR tube has the primary job of diconnecting the receiver during pluse transmit.

Question 2

8-16B4

What device is located between the magnetron and the mixer and
prevents received signals from entering the magnetron?

A. The ATR tube.
B. The TR tube.
C. The RF Attenuator.
D. A resonant cavity.

Answer 2

ANSWER A
The ATR circuit (tube) keeps received echos out of the transmitter.