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RF UR > Block 2 > Flashcards

Block 2 Flashcards

1
Q

What three things characterize a radio wave?

A

Amplitude, frequency and wavelength

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2
Q

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

A

Amplitude

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3
Q

Frequency and wavelength have what kind of relationship?

A

Inverse

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4
Q

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

A

Frequency

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5
Q

The distance between successive crests of waves is

A

Wavelength

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6
Q

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

A

Radio Propagation

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7
Q

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

A

The ionosphere (the uppermost part of the atmosphere)

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8
Q

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

A

Heterodyning

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9
Q

The DIFF and SUM of frequencies are

A

Sidebands

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10
Q

How many layers does the Ionosphere have?

A
  1. D, E and F (F1 and F2)
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11
Q

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

A

True

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12
Q

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

A

Composite Signal

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13
Q

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

A

True

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14
Q

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

A

True

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15
Q

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

A

True

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16
Q

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

A

Single side band (SSB) transmission

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17
Q

Single side band (SSB) transmissions are primarily use for

A

Beyond line of sight (BLOS)

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18
Q

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

A

No signal out (modulation doesn’t occur)

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19
Q

What are some advantages of single side band transmission?

A
  • Spectrum conservation
  • Power Efficiency
  • Effective gain in transmit and receive
  • Total effective gain
  • Peak envelope power
  • Better signal-noise ratio (SNR)
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20
Q

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

A

Spectrum conservation

21
Q

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

A

True

22
Q

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

A

True

23
Q

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

A

Single side band (SSB)

24
Q

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

A

Peak envelope power (PEP)

25
Q

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

A

It will have virtually no power out

26
Q

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

A

True

27
Q

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

A

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

28
Q

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

A

Encrypt/decrypt radio signals

29
Q

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

A

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

30
Q

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

A

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

31
Q

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

A
  • Fix (single channel)
  • HOP (frequency hopping)
  • ALE (automatic link establishment)
  • 3G (faster form of ALE)
  • 3G (faster form of ALE)
32
Q

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

A

Continuous wave (CW)

33
Q

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

A

1W, 5W and 10W

34
Q

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

A

Manpack, vehicular and base station

35
Q

What is the HF frequency band range?

A

3 MHz - 30 MHz

36
Q

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

A

Single side band

37
Q

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

A

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

38
Q

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

A

2.7 KHz

39
Q

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

A

3 dB

40
Q

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

A

ALE

41
Q

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

A

Sound and exchange

42
Q

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

A

20 W

43
Q

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

A

Citadel Cover (CC)

44
Q

What is the RF input impedance from the antenna?

A

50 ohms

45
Q

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

A

2 MHz - 29.9999 MHz

46
Q

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

A

OE-505 manpack whip antenna

47
Q

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

A

Cover connectors with rubber boot covers

48
Q

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

A

False

RF UR (11 decks)

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