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Ham General 2015-2019 > SUBELEMENT G8 – SIGNALS AND EMISSIONS > Flashcards

SUBELEMENT G8 – SIGNALS AND EMISSIONS Flashcards

1
Q

G8A01 (B)

How is an FSK signal generated?

A

B. By changing an oscillator’s frequency directly with a digital control signal

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2
Q

G8A02 (B)

What is the name of the process that changes the phase angle of an RF wave to convey information?

A

B. Phase modulation

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3
Q

G8A03 (D)

What is the name of the process that changes the instantaneous frequency of an RF wave to convey information?

A

D. Frequency modulation

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4
Q

G8A04 (B)

What emission is produced by a reactance modulator connected to a transmitter RF amplifier stage?

A

B. Phase modulation

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5
Q

G8A05 (D)

What type of modulation varies the instantaneous power level of the RF signal?

A

D. Amplitude modulation

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6
Q

G8A06 (C)
What is one advantage of carrier suppression in a single sideband phone transmission versus full carrier amplitude modulation?

A

C. Available transmitter power can be used more effectively

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7
Q

G8A07 (A)

Which of the following phone emissions uses the narrowest bandwidth?

A

A. Single sideband

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8
Q

G8A08 (D)

Which of the following is an effect of overmodulation?

A

D. Excessive bandwidth

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9
Q

G8A09 (B)

What control is typically adjusted for proper ALC setting on an amateur single sideband transceiver?

A

B. Transmit audio or microphone gain

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10
Q

G8A10 (C)

What is meant by the term flat-topping when referring to a single sideband phone transmission?

A

C. Signal distortion caused by excessive drive

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11
Q

G8A11 (A)

What is the modulation envelope of an AM signal?

A

A. The waveform created by connecting the peak values of the modulated signal

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12
Q

G8B01 (A)
What receiver stage combines a 14.250 MHz input signal with a 13.795 MHz oscillator signal to produce a 455 kHz intermediate frequency (IF) signal?

A

A. Mixer

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13
Q

G8B02 (B)
If a receiver mixes a 13.800 MHz VFO with a 14.255 MHz received signal to produce a 455 kHz intermediate frequency (IF) signal, what type of interference will a 13.345 MHz signal produce in the receiver?

A

B. Image response

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14
Q

G8B03 (A)

What is another term for the mixing of two RF signals?

A

A. Heterodyning

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15
Q

G8B04 (D)
What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?

A

D. Multiplier

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16
Q

G8B05 (D)

What is the approximate bandwidth of a PACTOR3 signal at maximum data rate?

A

D. 2300 Hz

17
Q

G8B06 (D)

What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?

A

D. 16 kHz

18
Q

G8B07 (B)
What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?

A

B. 416.7 Hz

19
Q

G8B08 (B)

Why is it important to know the duty cycle of the mode you are using when transmitting?

A

B. Some modes have high duty cycles which could exceed the transmitter’s average power rating.

20
Q

G8B09 (D)

Why is it good to match receiver bandwidth to the bandwidth of the operating mode?

A

D. It results in the best signal to noise ratio

21
Q

G8B10 (B)

What is the relationship between transmitted symbol rate and bandwidth?

A

B. Higher symbol rates require wider bandwidth

22
Q

G8C01 (B)

Which of the following digital modes is designed to operate at extremely low signal strength on the HF bands?

A

B. JT9 and JT65

23
Q

G8C02(A)

How many data bits are sent in a single PSK31 character?

A

A. The number varies

24
Q

G8C03 (C)

What part of a data packet contains the routing and handling information?

A

C. Header

25
Q

G8C04 (C)

Which of the following describes Baudot code?

A

C. A 5-bit code with additional start and stop bits

26
Q

G8C05 (A)

In the PACTOR protocol, what is meant by an NAK response to a transmitted packet?

A

A. The receiver is requesting the packet be retransmitted

27
Q

G8C06 (B)
What action results from a failure to exchange information due to excessive transmission attempts when using PACTOR or WINMOR?

A

B. The connection is dropped

28
Q

G8C07 (B)

How does the receiving station respond to an ARQ data mode packet containing errors?

A

B. It requests the packet be retransmitted

29
Q

G8C08 (B)

Which of the following statements is true about PSK31?

A

B. Upper case letters use longer Varicode signals and thus slow down transmission

30
Q

G8C09 (A)

What does the number 31 represent in “PSK31”?

A

A. The approximate transmitted symbol rate

31
Q

G8C10 (C)

How does forward error correction (FEC) allow the receiver to correct errors in received data packets?

A

C. By transmitting redundant information with the data

32
Q

G8C11 (D)

How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified?

A

D. Mark and Space

33
Q

G8C12 (A)

Which type of code is used for sending characters in a PSK31 signal?

A

A. Varicode

Ham General 2015-2019 (10 decks)

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