Weather Radar

Question 1

The longer the distance (what will happen to the transmission pulse rate):

Answer 1

the slower the rate the pulses are transmitted

Question 2

There is a high speed electronic switch called a ______ which routes the RF energy between the transmitter and antenna, and the antenna and the receiver.

Answer 2

duplexer

Question 3

The duplexer allows for the use of one antenna to:

Answer 3

both transmit and receive

Question 4

One RADAR mile measured in time is:

Answer 4

12.36 micro seconds

Question 5

Plane Position Indicator (PPI) is type of RADAR scope that shows:

Answer 5

distance and direction (azimuth) to the target.

Question 6

There are no pulses from a Continuous Wave (CW) RADAR because:

Answer 6

it transmits and receives at the same time

Question 7

Doppler RADAR does not determine distance, but the rate of:

Answer 7

change of distance or velocity

Question 8

With a stationary target, differences may be created by continuously varying the:

Answer 8

transmitter’s frequency.

Question 9

The FM return echo will have a slightly different frequency than the outgoing burst. The difference between the frequencies is then:

Answer 9

converted into distance

Question 10

Due to the difficulty in isolating the transmitter and receiver, and the ease of measuring distance with pulses, CW RADAR is:

Answer 10

not as widely used on aircraft as pulsed RADAR.

Question 11

What are the six essential components of pulse RADAR systems?

Answer 11

1. The synchronizer (timer/keyer)
2. The transmitter
3. The duplexer
4. The receiver
5. The antenna
6. The display/indicator

Question 12

Airborne RADAR typically operates in one of two frequency bands:

Answer 12

C-band or X-band

Question 13

RADAR system frequencies are in which part of the radio frequency spectrum?

Answer 13

Super High Frequency (SHF)

Question 14

S-band RADAR operates in which frequency band?

Answer 14

2-4GHz

Question 15

RADAR operating at a frequency of
3 GHz has a wavelength of approximately what?

Answer 15

10cm

Question 16

The resolution of a RADAR system defines its ability to:

Answer 16

accurately display the various levels of storm activity scanned by the RADAR.

Question 17

The major advantage of S-Band RADAR over X-Band is:

Answer 17

that it is less affected by weather conditions.

Question 18

The magnetron makes use of resonant cavities to:

Answer 18

generate the operating
frequency for the transmitted pulse or output signal.

Question 19

What is “listening time”?

Answer 19

It’s where the RADAR is listening for the return echo from the target.

Question 20

A short pulse width is used for _____ distance scans.
A long pulse width is used for _____ distance weather scans.

Answer 20

short
long

Question 21

Remember, the minimum range of a RADAR transmission is:

Answer 21

determined by the transmitted pulse width.

Question 22

Remember, a duplexer allows the same antenna to:

Answer 22

be used for both transmit and receive.

Question 23

Resistive losses in a waveguide are very low due to:

Answer 23

the waveguide having a large internal surface area for the signal to travel.

Question 24

T/R Box (Transmitter Receiver
Box) houses the:

Answer 24

duplexer.

Question 25

What does an attenuator for?

Answer 25

It lowers the power level of the microwave signal from the magnetron while maintaining the waveform.

Question 26

What is the RADAR local oscillator called?

Answer 26

Klystron

Question 27

The primary operating frequency of a Reflex Klystron is controlled by:

Answer 27

the dimensions of the resonant cavity.

Question 28

The basic frequency-determining element in a Gunn oscillator is the:

Answer 28

resonant cavity.

Question 29

Dynamic-range conversion is not a form of an ____________ conversion.

Answer 29

analog-digital

Question 30

Who makes all of these cards for studying while Eric goes out and drinks and gambles?

Answer 30

Madi