Term
| T7A01 What is the function of a product detector? |
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Definition
| Detect CW and SSB signals |
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Term
T7A02 What type of receiver is shown in Figure T6?
[image] |
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Definition
| Single-conversion superheterodyne |
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Term
| T7A03 What is the function of a mixer in a superheterodyne receiver? |
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Definition
| To shift the incoming signal to an intermediate frequency |
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Term
T7A04 What circuit is pictured in Figure T7, if block 1 is a frequency discriminator?
[image] |
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Definition
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Term
T7A05 What is the function of block 1 if figure T4 is a simple CW transmitter?
[image] |
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Definition
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Term
| T7A06 What device takes the output of a low-powered 28 MHz SSB exciter and produces a 222 MHz output signal? |
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Definition
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Term
T7A07 If figure T5 represents a transceiver in which block 1 is the transmitter portion and block 3 is the receiver portion, what is the function of block 2?
[image] |
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Definition
| A transmit-receive switch |
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Term
| T7A08 Which of the following circuits combines a speech signal and an RF carrier? |
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Definition
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Term
| T7A09 Which of the following devices is most useful for VHF weak-signal communication? |
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Definition
| A multi-mode VHF transceiver |
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Term
| T7A10 What device increases the low-power output from a handheld transceiver? |
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Definition
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Term
| T7A11 Which of the following circuits demodulates FM signals? |
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Definition
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Term
| T7A12 Which term describes the ability of a receiver to discriminate between multiple signals? |
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Definition
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Term
| T7A13 Where is an RF preamplifier installed? |
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Definition
| Between the antenna and receiver |
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Term
| T7B01 What can you do if you are told your FM handheld or mobile transceiver is over deviating? |
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Definition
| Talk farther away from the microphone |
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Term
| T7B02 What is meant by fundamental overload in reference to a receiver? |
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Definition
| Interference caused by very strong signals |
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Term
| T7B03 Which of the following may be a cause of radio frequency interference? |
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Definition
| Fundamental overload AND Harmonics AND Spurious emissions AND All of these choices are correct |
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Term
| T7B04 What is the most likely cause of interference to a non-cordless telephone from a nearby transmitter? |
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Definition
| The telephone is inadvertently acting as a radio receiver |
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Term
| T7B05 What is a logical first step when attempting to cure a radio frequency interference problem in a nearby telephone? |
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Definition
| Install an RF filter at the telephone |
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Term
| T7B06 What should you do first if someone tells you that your stations transmissions are interfering with their radio or TV reception? |
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Definition
| Make sure that your station is functioning properly and that it does not cause interference to your own television |
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Term
| T7B07 Which of the following may be useful in correcting a radio frequency interference problem? |
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Definition
| Snap-on ferrite chokes AND Low-pass and high-pass filters AND Band-reject and band-pass filters AND All of these choices are correct |
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Term
| T7B08 What should you do if a "Part 15" device in your neighbors home is causing harmful interference to your amateur station? |
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Definition
| Work with your neighbor to identify the offending device AND Politely inform your neighbor about the rules that require him to stop using the device if it causes interference AND Check your station and make sure it meets the standards of good amateur practice AND All of these choices are correct |
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Term
| T7B09 What could be happening if another operator reports a variable high-pitched whine on the audio from your mobile transmitter? |
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Definition
| Noise on the vehicles electrical system is being transmitted along with your speech audio |
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Term
| T7B10 What might be the problem if you receive a report that your audio signal through the repeater is distorted or unintelligible? |
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Definition
| Your transmitter may be slightly off frequency AND Your batteries may be running low AND You could be in a bad location AND All of these choices are correct |
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Term
| T7B11 What is a symptom of RF feedback in a transmitter or transceiver? |
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Definition
| Reports of garbled, distorted, or unintelligible transmissions |
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Term
| T7B12 What does the acronym "BER" mean when applied to digital communications systems? |
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Definition
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Term
| T7C01 What is the primary purpose of a dummy load? |
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Definition
| To prevent the radiation of signals when making tests |
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Term
| T7C02 Which of the following instruments can be used to determine if an antenna is resonant at the desired operating frequency? |
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Definition
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Term
| T7C03 What, in general terms, is standing wave ratio (SWR)? |
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Definition
| A measure of how well a load is matched to a transmission line |
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Term
| T7C04 What reading on an SWR meter indicates a perfect impedance match between the antenna and the feedline? |
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Definition
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Term
| T7C05 What is the approximate SWR value above which the protection circuits in most solid-state transmitters begin to reduce transmitter power? |
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Definition
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Term
| T7C06 What does an SWR reading of 4:1 mean? |
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Definition
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Term
| T7C07 What happens to power lost in a feedline? |
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Definition
| It is converted into heat |
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Term
| T7C08 What instrument other than an SWR meter could you use to determine if a feedline and antenna are properly matched? |
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Definition
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Term
| T7C09 Which of the following is the most common cause for failure of coaxial cables? |
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Definition
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Term
| T7C10 Why should the outer jacket of coaxial cable be resistant to ultraviolet light? |
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Definition
| Ultraviolet light can damage the jacket and allow water to enter the cable |
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Term
| T7C11 What is a disadvantage of "air core" coaxial cable when compared to foam or solid dielectric types? |
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Definition
| It requires special techniques to prevent water absorption |
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Term
| T7D01 Which instrument would you use to measure electric potential or electromotive force? |
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Definition
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Term
| T7D02 What is the correct way to connect a voltmeter to a circuit? |
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Definition
| In parallel with the circuit |
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Term
| T7D03 How is an ammeter usually connected to a circuit? |
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Definition
| In series with the circuit |
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Term
| T7D04 Which instrument is used to measure electric current? |
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Definition
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Term
| T7D05 What instrument is used to measure resistance? |
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Definition
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Term
| T7D06 Which of the following might damage a multimeter? |
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Definition
| Attempting to measure voltage when using the resistance setting |
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Term
| T7D07 Which of the following measurements are commonly made using a multimeter? |
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Definition
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Term
| T7D08 Which of the following types of solder is best for radio and electronic use? |
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Definition
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Term
| T7D09 What is the characteristic appearance of a "cold" solder joint? |
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Definition
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Term
| T7D10 What is probably happening when an ohmmeter, connected across a circuit, initially indicates a low resistance and then shows increasing resistance with time? |
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Definition
| The circuit contains a large capacitor |
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Term
| T7D11 Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter? |
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Definition
| Ensure that the circuit is not powered |
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