Topic T4A Quick Review Audio


What must be considered to determine the minimum current capacity needed for a transceiver power supply?

  1. Efficiency of the transmitter at full power output
  2. Receiver and control circuit power
  3. Power supply regulation and heat dissipation
  4. All of these choices are correct


How might a computer be used as part of an amateur radio station?

  1. For logging contacts and contact information
  2. For sending and/or receiving CW
  3. For generating and decoding digital signals
  4. All of these choices are correct


Why should wiring between the power source and radio be heavy-gauge wire and kept as short as possible?

  1. To avoid voltage falling below that needed for proper operation
  2. To provide a good counterpoise for the antenna
  3. To avoid RF interference
  4. All of these choices are correct


Which computer sound card port is connected to a transceiver's headphone or speaker output for operating digital modes?

  1. Headphone output
  2. Mute
  3. Microphone or line input
  4. PCI or SDI


What is the proper location for an external SWR meter?

  1. In series with the feed line, between the transmitter and antenna
  2. In series with the station's ground
  3. In parallel with the push-to-talk line and the antenna
  4. In series with the power supply cable, as close as possible to the radio


Which of the following connections might be used between a voice transceiver and a computer for digital operation?

  1. Receive and transmit mode, status, and location
  2. Antenna and RF power
  3. Receive audio, transmit audio, and push-to-talk (PTT)
  4. NMEA GPS location and DC power


How is a computer's sound card used when conducting digital communications?

  1. The sound card communicates between the computer CPU and the video display
  2. The sound card records the audio frequency for video display
  3. The sound card provides audio to the radio's microphone input and converts received audio to digital form
  4. All of these choices are correct


Which of the following conductors provides the lowest impedance to RF signals?

  1. Round stranded wire
  2. Round copper-clad steel wire
  3. Twisted-pair cable
  4. Flat strap


Which of the following could you use to cure distorted audio caused by RF current on the shield of a microphone cable?

  1. Band-pass filter
  2. Low-pass filter
  3. Preamplifier
  4. Ferrite choke


What is the source of a high-pitched whine that varies with engine speed in a mobile transceiver's receive audio?

  1. The ignition system
  2. The alternator
  3. The electric fuel pump
  4. Anti-lock braking system controllers


Where should the negative return connection of a mobile transceiver's power cable be connected?

  1. At the battery or engine block ground strap
  2. At the antenna mount
  3. To any metal part of the vehicle
  4. Through the transceiver's mounting bracket