Block 2

Question 1

What three things characterize a radio wave?

Answer 1

Amplitude, frequency and wavelength

Question 2

The magnitude of change in the height of the radio wave is

Answer 2

Amplitude

Question 3

Frequency and wavelength have what kind of relationship?

Answer 3

Inverse

Question 4

The number of cycles completed by a periodic quantity in a unit of time is

Answer 4

Frequency

Question 5

The distance between successive crests of waves is

Answer 5

Wavelength

Question 6

The behavior of radio waves when they are transmitted from one point to another is

Answer 6

Radio Propagation

Question 7

HF Sky Wave Propagation utilizes what to make beyond line of sight (BLOS) communication possible?

Answer 7

The ionosphere (the uppermost part of the atmosphere)

Question 8

The process of combining two or more frequencies across a nonlinear device to produce a new frequency is

Answer 8

Heterodyning

Question 9

The DIFF and SUM of frequencies are

Answer 9

Sidebands

Question 10

How many layers does the Ionosphere have?

Answer 10

3. D, E and F (F1 and F2)

Question 11

Both LSB and USB are offset the same value from the carrier (T/F)

Answer 11

True

Question 12

The amplitude of the RF Carrier changes to match the instantaneous amplitude changes of the modulating signal creates a

Answer 12

Composite Signal

Question 13

When heterodyned the RF Carrier has a representation of the audio superimposed on it (T/F)

Answer 13

True

Question 14

In amplitude modulation (AM) carrier is transmitted even when no modulating signal (intelligence) is present (T/F)

Answer 14

True

Question 15

In amplitude modulation (AM) lower side band (LSB) and upper side band (USB) are transmitted - even though they contain the same intelligence (T/F)

Answer 15

True

Question 16

A variant of AM that uses transmitter power and bandwidth more efficiently by suppressing the carrier and on of the side bands is

Answer 16

Single side band (SSB) transmission

Question 17

Single side band (SSB) transmissions are primarily use for

Answer 17

Beyond line of sight (BLOS)

Question 18

In single side band (SSB) if there is no signal in, what occurs?

Answer 18

No signal out (modulation doesn’t occur)

Question 19

What are some advantages of single side band transmission?

Answer 19

• Spectrum conservation
• Power Efficiency
• Effective gain in transmit and receive
• Total effective gain
• Peak envelope power
• Better signal-noise ratio (SNR)

Question 20

Decreasing bandwidth of each channel in a radio system to all for more channels in the overall radio spectrum is

Answer 20

Spectrum conservation

Question 21

Total HF spectrum is smaller therefore channel spacing needs to be smaller (T/F)

Answer 21

True

Question 22

Power output is only developed when carrier is modulated (T/F)

Answer 22

True

Question 23

What can concentrate almost all available power into a single side band (making it more efficient?

Answer 23

Single side band (SSB)

Question 24

A transmitter’s averaged power output during one RF cycle (or a sample) at the highest crest of the modulation envelope is

Answer 24

Peak envelope power (PEP)

Question 25

What happens when a single side band (SSB) transmitter is keyed and un-modulated?

Answer 25

It will have virtually no power out

Question 26

If no audio is applied, no side band is developed. (T/F)

Answer 26

True

Question 27

Why is signal-noise ratio (SNR) better in single side band (SSB) transmissions?

Answer 27

Because the other side band is eliminated, decreasing the bandwidth.

Question 28

A controlled cryptographic item (CCI) has the capability to do what?

Answer 28

Encrypt/decrypt radio signals

Question 29

For a controlled cryptographic item (CCI) the guidance is somewhat vague, but ...

Answer 29

It is generally understood that CCI equipment will never be left unattended

Question 30

What are the frequency ranges for the AN/PRC-150(C)?

Answer 30

SSB - 1.6 t0 29.99 MHz (100 Hz steps) FM - 20 to 59.99 MHz (100 Hz steps) HF - 1.6 to 29.99 MHz

Question 31

What are the modes for the AN/PRC-150(C)?

Answer 31

- Fix (single channel) - HOP (frequency hopping) - ALE (automatic link establishment) - 3G (faster form of ALE) - 3G (faster form of ALE)

Question 32

What function of the the AN/PRC-150(C) results in transmitting a 1000 Hz tone?

Answer 32

Continuous wave (CW)

Question 33

What are the the AN/PRC-150(C) power output options when functioning in FM modulation?

Answer 33

1W, 5W and 10W

Question 34

What are the configurations for the AN/PRC-150(C)?

Answer 34

Manpack, vehicular and base station

Question 35

What is the HF frequency band range?

Answer 35

3 MHz - 30 MHz

Question 36

What type of transmitted or received signal has only one side band?

Answer 36

Single side band

Question 37

What does a HF radio with automatic link establishment (ALE) create?

Answer 37

Link quality analysis (LQA) table, which scores the inherent quality levels of potential channels for communication on HF.

Question 38

What is the standard bandwidth of a single side band (SSB) voice signal?

Answer 38

2.7 KHz

Question 39

What is the effective dB gain of a single side band (SSB) receiver?

Answer 39

3 dB

Question 40

What was developed to increase a HF operator's chances of successful communications?

Answer 40

ALE

Question 41

What are the two types of link quality analysis (LQA) scoring?

Answer 41

Sound and exchange

Question 42

What is the maximum output power of the AN/PRC-150(C) when in FM mode?

Answer 42

20 W

Question 43

Which switch position still provides secure communications with forces that may not be authorized for Type I Cipher Text?

Answer 43

Citadel Cover (CC)

Question 44

What is the RF input impedance from the antenna?

Answer 44

50 ohms

Question 45

What is the AN/PRC-150 frequency hopping frequency range?

Answer 45

2 MHz - 29.9999 MHz

Question 46

What antenna kit is provided with the AN/PRC-150?

Answer 46

OE-505 manpack whip antenna

Question 47

What can you do to reduce moisture damage to the AN/PRC-150 connectors?

Answer 47

Cover connectors with rubber boot covers

Question 48

When installing batteries for the AN/PRC-150, you can use batteries of different chemistry. (T/F)

Answer 48

False