Which mixer input is varied or tuned to convert signals of different frequencies to an intermediate frequency (IF)?

1. A Image frequency
2. B Local oscillator
3. C RF input
4. D Beat frequency oscillator

What is the term for interference from a signal at twice the IF frequency from the desired signal?

1. A Quadrature response
2. B Image response
3. C Mixer interference
4. D Intermediate interference

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

1. A Heterodyning
2. B Synthesizing
3. C Frequency inversion
4. D Phase inversion

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

1. A Mixer
2. B Reactance modulator
3. C Balanced converter
4. D Multiplier

Which intermodulation products are closest to the original signal frequencies?

1. A Second harmonics
2. B Even-order
3. C Odd-order
4. D Intercept point

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

1. A 3 kHz
2. B 5 kHz
3. C 8 kHz
4. D 16 kHz

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

1. A 101.75 Hz
2. B 416.7 Hz
3. C 5 kHz
4. D 60 kHz

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

1. A To aid in tuning your transmitter
2. B Some modes have high duty cycles that could exceed the transmitter's average power rating
3. C To allow time for the other station to break in during a transmission
4. D To prevent overmodulation

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

1. A It is required by FCC rules
2. B It minimizes power consumption in the receiver
3. C It improves impedance matching of the antenna
4. D It results in the best signal-to-noise ratio

What is the relationship between transmitted symbol rate and bandwidth?

1. A Symbol rate and bandwidth are not related
2. B Higher symbol rates require wider bandwidth
3. C Lower symbol rates require wider bandwidth
4. D Bandwidth is half the symbol rate

What combination of a mixer's Local Oscillator (LO) and RF input frequencies is found in the output?

1. A The ratio
2. B The average
3. C The sum and difference
4. D The arithmetic product

What process combines two signals in a non-linear circuit to produce unwanted spurious outputs?

1. A Intermodulation
2. B Heterodyning
3. C Detection
4. D Rolloff

Which of the following is an odd-order intermodulation product of frequencies F1 and F2?

1. A 5F1-3F2
2. B 3F1-F2
3. C 2F1-F2
4. D All these choices are correct