Group T4A

12 questions from the official pool, drawn by ID — exact wording, never retyped.

T4A01 Which of the following is an appropriate power supply rating for a typical 50-watt output mobile FM transceiver?

A 24.0 volts at 4 amperes B 13.8 volts at 4 amperes C 24.0 volts at 12 amperes D 13.8 volts at 12 amperes

T4A02 Which of the following should be considered when selecting an accessory SWR meter?

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 maximum SWR anticipated on the transmission line D The ability of the meter to compensate for a poor transmission line match to the antenna

T4A03 Why are short, heavy-gauge wires used for a transceiver's DC power connection?

A To minimize voltage drop when transmitting B To provide a close match to the power supply output impedance C To avoid RF interference D To minimize radiative losses in the power cable

T4A04 How are the audio input and output of a transceiver connected in a station configured to operate using FT8?

A To a computer running a terminal program and connected to a terminal node controller unit B To the audio output and input of a computer running FT8 software C To an FT8 conversion unit, a keyboard, and a computer monitor D To a computer connected to the FT8converter.com website

T4A05 Where should an RF power meter be installed?

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 D In the power supply cable, as close as possible to the radio

T4A06 What signals are used in a computer-radio interface for digital mode operation?

A Receive and transmit mode, status, and location B Antenna and RF power C Receive audio, transmit audio, and transmitter keying D NMEA GPS location and DC power

T4A07 Which of the following is one of the connections required between a computer and a transceiver to operate digital modes?

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 D Computer "line out" to transceiver speaker connector

T4A08 Which of the following conductors is preferred for bonding at RF?

A Copper braid removed from coaxial cable B Copper-clad steel wire C Twisted-pair cable D Flat copper strap

T4A09 How can you determine the length of time that equipment can be powered from a battery?

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 D Multiply the square of the current rating of the battery by the input resistance of the equipment

T4A10 What function does a digital mode hotspot perform for nearby transceivers?

A Communication with a digital voice or data network B FT8 digital communications via AFSK using a smartphone connected to the internet C RTTY encoding and decoding without a computer D High-speed digital communications for meteor scatter

T4A11 Where should the negative power return of a mobile transceiver be connected in a vehicle?

A At the 12-volt battery chassis ground B To the shell of the power connector C To any metal part of the vehicle D Through the transceiver's mounting bracket

T4A12 What is an electronic keyer?

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