G8B – Frequency changing; bandwidths of various modes; deviation; intermodulation

- [[G8B01]] (B)
Which mixer input is varied or tuned to convert signals of different frequencies to an intermediate frequency (IF)? #card
	- A. Image frequency
	- B. Local oscillator
	- C. RF input
	- D. Beat frequency oscillator
- [[G8B02]] (B)
What is the term for interference from a signal at twice the IF frequency from the desired signal? #card
	- A. Quadrature response
	- B. Image response
	- C. Mixer interference
	- D. Intermediate interference
- [[G8B03]] (A)
What is another term for the mixing of two RF signals? #card
	- A. Heterodyning
	- B. Synthesizing
	- C. Frequency inversion
	- D. Phase inversion
- [[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? #card
	- A. Mixer
	- B. Reactance modulator
	- C. Balanced converter
	- D. Multiplier
- [[G8B05]] (C)
Which intermodulation products are closest to the original signal frequencies? #card
	- A. Second harmonics
	- B. Even-order
	- C. Odd-order
	- D. Intercept point
- [[G8B06]] (D)
What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency? #card
	- A. 3 kHz
	- B. 5 kHz
	- C. 8 kHz
	- D. 16 kHz
- [[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? #card
	- A. 101.75 Hz
	- B. 416.7 Hz
	- C. 5 kHz
	- D. 60 kHz
- [[G8B08]] (B)
Why is it important to know the duty cycle of the mode you are using when transmitting? #card
	- A. To aid in tuning your transmitter
	- B. Some modes have high duty cycles that could exceed the transmitter’s average power rating
	- C. To allow time for the other station to break in during a transmission
	- D. To prevent overmodulation
- [[G8B09]] (D)
Why is it good to match receiver bandwidth to the bandwidth of the operating mode? #card
	- A. It is required by FCC rules
	- B. It minimizes power consumption in the receiver
	- C. It improves impedance matching of the antenna
	- D. It results in the best signal-to-noise ratio
- [[G8B10]] (B)
What is the relationship between transmitted symbol rate and bandwidth? #card
	- A. Symbol rate and bandwidth are not related
	- B. Higher symbol rates require wider bandwidth
	- C. Lower symbol rates require wider bandwidth
	- D. Bandwidth is half the symbol rate
- [[G8B11]] (C)
What combination of a mixer’s Local Oscillator (LO) and RF input frequencies is found in the output? #card
	- A. The ratio
	- B. The average
	- C. The sum and difference
	- D. The arithmetic product
- [[G8B12]] (A)
What process combines two signals in a non-linear circuit to produce unwanted spurious outputs? #card
	- A. Intermodulation
	- B. Heterodyning
	- C. Detection
	- D. Rolloff
- [[G8B13]] (C)
Which of the following is an odd-order intermodulation product of frequencies F1 and F2? #card
	- A. 5F1-3F2
	- B. 3F1-F2
	- C. 2F1-F2
	- D. All these choices are correct