Technician T4 and T5 Test Questions Flashcards
Which of the following is an appropriate power supply rating for a typical 50 watt output mobile FM transceiver? T4A01
13.8 volts at 12 amperes
5-16
Which of the following should be considered when selecting an accessory SWR meter? T4A02
The frequency and power level at which the measurements will be made
4-10
Why are short, heavy-gauge wires used for a transceiver’s DC power connection? T4A03
To minimize voltage drop when transmitting
5-17
How are the transceiver audio input and output connected in a station configured to operate using FT8? T4A04
To the audio input and output of a computer running WSJT-X software
5-14
Where should an RF power meter be installed? T4A05
In the feed line, between the transmitter and antenna
4-18
What signals are used in a computer-radio interface for digital mode operation? T4A06
Receive audio, transmit audio, and transmitter keying
5-14
Which of the following connections is made between a computer and a transceiver to use computer software when operating digital modes? T4A07
Computer “line in” to transceiver speaker connection
5-14
Which of the following conductors is preferred for bonding at RF? T4A08
Flat copper strap
9-6
How can you determine the length of time that equipment can be powered from a batter? T4A09
Divide the battery ampere-hour rating by the average current draw of the equipment
5-17
What function is performed with a transceiver and a digital mode hot spot? T4A10
Communication using digital voice or data systems via the internet
6-13
Where should the negative power return of a mobile transceiver be connected in a vehicle? T4A11
At the 12 volt battery chassis ground
5-17
What is an electronic keyer? T4A12
A device that assists in manual sending of Morse Code
5-7
What is the effect of excessive microphone gain on SSB transmissions? T4B01
Distorted transmitted audio
5-8
Which of the following can be used to enter a transceiver’s operating frequency? T4B02
The keypad or VFO knob
5-5
How is squelch adjusted so that a weak FM signal can be heard? T4B03
Set the squelch threshold so that receiver output audio is on all the time
5-8
What is a way to enable quick access to a favorite frequency or channel on your transceiver? T4B04
Store it in a memory channel
5-5
What does the scanning function of an FM transceiver do? T4B05
Tunes through a range of frequencies to check for activity
6-10
Which of the following controls could be used if the voice pitch of a single-sideband signal returning to your CQ call seems too high or low? T4B06
The RIT or Clarifier
5-9
What does a DMR “code plug” contain? T4B07
Access information for repeaters and talkgroups
6-13
What is the advantage of having multiple receive bandwidth choices on a multimode transceiver? T4B08
Permits noise or interference reduction by selecting a bandwidth matching the mode
5-9
How is a specific group of stations selected on a digital voice transceiver? T4B09
By entering the group’s identification code
6-13
Which of the following receiver filter bandwidths provides the best signal to noise ratio for SSB reception? T4B10
2400 Hz
5-9
Which of the following must be programmed into a D-STAR digital transceiver before transmitting? T4B11
Your call sign
6-13
What is the result of tuning an FM receiver above or below a signal’s frequency? T4B12
Distortion of the signal’s audio
5-9
