What is meant by the blocking dynamic range of a receiver?

1. A The difference in dB between the noise floor and the level of an incoming signal that will cause 1 dB of gain compression
2. B The minimum difference in dB between the levels of two FM signals that will cause one signal to block the other
3. C The difference in dB between the noise floor and the third-order intercept point
4. D The minimum difference in dB between two signals which produce third-order intermodulation products greater than the noise floor

Which of the following describes problems caused by poor dynamic range in a receiver?

1. A Spurious signals caused by cross modulation and desensitization from strong adjacent signals
2. B Oscillator instability requiring frequent retuning and loss of ability to recover the opposite sideband
3. C Poor weak signal reception caused by insufficient local oscillator injection
4. D Oscillator instability and severe audio distortion of all but the strongest received signals

What creates intermodulation interference between two repeaters in close proximity?

1. A The output signals cause feedback in the final amplifier of one or both transmitters
2. B The output signals mix in the final amplifier of one or both transmitters
3. C The input frequencies are harmonically related
4. D The output frequencies are harmonically related

Which of the following is used to reduce or eliminate intermodulation interference in a repeater caused by a nearby transmitter?

1. A A band-pass filter in the feed line between the transmitter and receiver
2. B A properly terminated circulator at the output of the repeater's transmitter
3. C Utilizing a Class C final amplifier
4. D Utilizing a Class D final amplifier

What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

1. A Reciprocal mixing
2. B Quieting
3. C Desensitization
4. D Cross modulation interference

Which of the following reduces the likelihood of receiver desensitization?

1. A Insert attenuation before the first RF stage
2. B Raise the receiver's IF frequency
3. C Increase the receiver's front-end gain
4. D Switch from fast AGC to slow AGC

What causes intermodulation in an electronic circuit?

1. A Negative feedback
2. B Lack of neutralization
3. C Nonlinear circuits or devices
4. D Positive feedback

What is the purpose of the preselector in a communications receiver?

1. A To store frequencies that are often used
2. B To provide broadband attenuation before the first RF stage to prevent intermodulation
3. C To increase the rejection of signals outside the band being received
4. D To allow selection of the optimum RF amplifier device

What does a third-order intercept level of 40 dBm mean with respect to receiver performance?

1. A Signals less than 40 dBm will not generate audible third-order intermodulation products
2. B The receiver can tolerate signals up to 40 dB above the noise floor without producing third-order intermodulation products
3. C A pair of 40 dBm input signals will theoretically generate a third-order intermodulation product that has the same output amplitude as either of the input signals
4. D A pair of 1 mW input signals will produce a third-order intermodulation product that is 40 dB stronger than the input signal

Why are odd-order intermodulation products, created within a receiver, of particular interest compared to other products?

1. A Odd-order products of two signals in the band being received are also likely to be within the band
2. B Odd-order products are more likely to overload the IF filters
3. C Odd-order products are an indication of poor image rejection
4. D Odd-order intermodulation produces three products for every input signal within the band of interest

What is the link margin in a system with a transmit power level of 10 W (+40 dBm), a system antenna gain of 10 dBi, a cable loss of 3 dB, a path loss of 136 dB, a receiver minimum discernable signal of -103 dBm, and a required signal-to-noise ratio of 6 dB?

1. A -8dB
2. B -14dB
3. C +8dB
4. D +14dB

What is the received signal level with a transmit power of 10 W (+40 dBm), a transmit antenna gain of 6 dBi, a receive antenna gain of 3 dBi, and a path loss of 100 dB?

1. A -51 dBm
2. B -54 dBm
3. C -57 dBm
4. D -60 dBm

What power level does a receiver minimum discernible signal of -100 dBm represent?

1. A 100 microwatts
2. B 0.1 microwatt
3. C 0.001 microwatts
4. D 0.1 picowatts