3.9 KiB
3.9 KiB
T4A – Station setup: connecting a microphone, a power source, a computer, digital equipment, an SWR meter; bonding; Mobile radio installation
- T4A01 (D)
Which of the following is an appropriate power supply rating for a typical 50 watt output mobile FM transceiver? #card
- A. 24.0 volts at 4 amperes
- B. 13.8 volts at 4 amperes
- C. 24.0 volts at 12 amperes
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D. 13.8 volts at 12 amperes
- T4A02 (A)
Which of the following should be considered when selecting an accessory SWR meter? #card
- A. The frequency and power level at which the measurements will be made
- B. The distance that the meter will be located from the antenna
- C. The types of modulation being used at the station
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D. All these choices are correct
- T4A03 (A)
Why are short, heavy-gauge wires used for a transceiver’s DC power connection? #card
- A. To minimize voltage drop when transmitting
- B. To provide a good counterpoise for the antenna
- C. To avoid RF interference
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D. All these choices are correct
- T4A04 (B)
How are the transceiver audio input and output connected in a station configured to operate using FT8? #card
- A. To a computer running a terminal program and connected to a terminal node controller unit
- B. To the audio input and output of a computer running WSJT-X software
- C. To an FT8 conversion unit, a keyboard, and a computer monitor
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D. To a computer connected to the FT8converter.com website
- T4A05 (A)
Where should an RF power meter be installed? #card
- A. In the feed line, between the transmitter and antenna
- B. At the power supply output
- C. In parallel with the push-to-talk line and the antenna
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D. In the power supply cable, as close as possible to the radio
- T4A06 (C)
What signals are used in a computer-radio interface for digital mode operation? #card
- A. Receive and transmit mode, status, and location
- B. Antenna and RF power
- C. Receive audio, transmit audio, and transmitter keying
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D. NMEA GPS location and DC power
- T4A07 (C)
Which of the following connections is made between a computer and a transceiver to use computer software when operating digital modes? #card
- A. Computer “line out” to transceiver push-to-talk
- B. Computer “line in” to transceiver push-to-talk
- C. Computer “line in” to transceiver speaker connector
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D. Computer “line out” to transceiver speaker connector
- T4A08 (D)
Which of the following conductors is preferred for bonding at RF? #card
- A. Copper braid removed from coaxial cable
- B. Steel wire
- C. Twisted-pair cable
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D. Flat copper strap
- T4A09 (B)
How can you determine the length of time that equipment can be powered from a battery? #card
- A. Divide the watt-hour rating of the battery by the peak power consumption of the equipment
- B. Divide the battery ampere-hour rating by the average current draw of the equipment
- C. Multiply the watts per hour consumed by the equipment by the battery power rating
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D. Multiply the square of the current rating of the battery by the input resistance of the equipment
- T4A10 (A)
What function is performed with a transceiver and a digital mode hot spot? #card
- A. Communication using digital voice or data systems via the internet
- B. FT8 digital communications via AFSK
- C. RTTY encoding and decoding without a computer
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D. High-speed digital communications for meteor scatter
- T4A11 (A)
Where should the negative power return of a mobile transceiver be connected in a vehicle? #card
- A. At the 12 volt battery chassis ground
- B. At the antenna mount
- C. To any metal part of the vehicle
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D. Through the transceiver’s mounting bracket
- T4A12 (C)
What is an electronic keyer? #card
- A. A device for switching antennas from transmit to receive
- B. A device for voice activated switching from receive to transmit
- C. A device that assists in manual sending of Morse code
- D. An interlock to prevent unauthorized use of a radio