AMATEUR RADIO PRACTICES
Subelement T4
Section T4A
Station setup: connecting a microphone, RF power meter, a power source, a computer, digital equipment, an SWR meter; bonding; Mobile radio installation
Which of the following is an appropriate power supply rating for a typical 50-watt output mobile FM transceiver?
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24.0 volts at 4 amperes
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13.8 volts at 4 amperes
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24.0 volts at 12 amperes
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Correct Answer13.8 volts at 12 amperes
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Which of the following should be considered when selecting an accessory SWR meter?
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Correct AnswerThe frequency and power level at which the measurements will be made
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The distance that the meter will be located from the antenna
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The maximum SWR anticipated on the transmission line
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The ability of the meter to compensate for a poor transmission line match to the antenna
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Why are short, heavy-gauge wires used for a transceiver’s DC power connection?
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Correct AnswerTo minimize voltage drop when transmitting
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To provide a close match to the power supply output impedance
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To avoid RF interference
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To minimize radiative losses in the power cable
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How are the audio input and output of a transceiver connected in a station configured to operate using FT8?
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To a computer running a terminal program and connected to a terminal node controller unit
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Correct AnswerTo the audio output and input of a computer running FT8 software
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To an FT8 conversion unit, a keyboard, and a computer monitor
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To a computer connected to the FT8converter.com website
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Where should an RF power meter be installed?
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Correct AnswerIn the feed line, between the transmitter and antenna
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At the power supply output
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In parallel with the push-to-talk line and the antenna
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In the power supply cable, as close as possible to the radio
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What signals are used in a computer-radio interface for digital mode operation?
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Receive and transmit mode, status, and location
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Antenna and RF power
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Correct AnswerReceive audio, transmit audio, and transmitter keying
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NMEA GPS location and DC power
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Which of the following is one of the connections required between a computer and a transceiver to operate digital modes?
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Computer “line out” to transceiver push-to-talk
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Computer “line in” to transceiver push-to-talk
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Correct AnswerComputer “line in” to transceiver speaker connector
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Computer “line out” to transceiver speaker connector
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Which of the following conductors is preferred for bonding at RF?
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Copper braid removed from coaxial cable
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Copper-clad steel wire
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Twisted-pair cable
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Correct AnswerFlat copper strap
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How can you determine the length of time that equipment can be powered from a battery?
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Divide the watt-hour rating of the battery by the peak power consumption of the equipment
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Correct AnswerDivide the battery ampere-hour rating by the average current draw of the equipment
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Multiply the watts per hour consumed by the equipment by the battery power rating
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Multiply the square of the current rating of the battery by the input resistance of the equipment
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What function does a digital mode hotspot perform for nearby transceivers?
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Correct AnswerCommunication with a digital voice or data network
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FT8 digital communications via AFSK using a smartphone connected to the internet
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RTTY encoding and decoding without a computer
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High-speed digital communications for meteor scatter
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Where should the negative power return of a mobile transceiver be connected in a vehicle?
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Correct AnswerAt the 12-volt battery chassis ground
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To the shell of the power connector
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To any metal part of the vehicle
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Through the transceiver’s mounting bracket
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What is an electronic keyer?
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A device for switching antennas from transmit to receive
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A device for voice activated switching from receive to transmit
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Correct AnswerA device that assists in manual sending of Morse code
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An interlock to prevent unauthorized use of a radio
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