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+T4B - Operating controls: frequency tuning, use of filters, squelch function, AGC, memory channels, noise blanker, microphone gain, receiver incremental tuning (RIT), bandwidth selection, digital transceiver configuration 
+
+- [[T4B01]] (B)
+What is the effect of excessive microphone gain on SSB transmissions? #card
+	- A. Frequency instability
+	- B. Distorted transmitted audio
+	- C. Increased SWR
+	- D. All these choices are correct
+
+- [[T4B02]] (A)
+Which of the following can be used to enter a transceiver’s operating frequency? #card
+	- A. The keypad or VFO knob
+	- B. The CTCSS or DTMF encoder
+	- C. The Automatic Frequency Control
+	- D. All these choices are correct
+
+- [[T4B03]] (A)
+How is squelch adjusted so that a weak FM signal can be heard? #card
+	- A. Set the squelch threshold so that receiver output audio is on all the time
+	- B. Turn up the audio level until it overcomes the squelch threshold
+	- C. Turn on the anti-squelch function
+	- D. Enable squelch enhancement
+
+- [[T4B04]] (B)
+What is a way to enable quick access to a favorite frequency or channel on your transceiver? #card
+	- A. Enable the frequency offset
+	- B. Store it in a memory channel
+	- C. Enable the VOX
+	- D. Use the scan mode to select the desired frequency
+
+- [[T4B05]] (C)
+What does the scanning function of an FM transceiver do? #card
+	- A. Checks incoming signal deviation
+	- B. Prevents interference to nearby repeaters
+	- C. Tunes through a range of frequencies to check for activity
+	- D. Checks for messages left on a digital bulletin board
+
+- [[T4B06]] (D)
+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? #card
+	- A. The AGC or limiter
+	- B. The bandwidth selection
+	- C. The tone squelch
+	- D. The RIT or Clarifier
+
+- [[T4B07]] (B)
+What does a DMR “code plug” contain? #card
+	- A. Your call sign in CW for automatic identification
+	- B. Access information for repeaters and talkgroups
+	- C. The codec for digitizing audio
+	- D. The DMR software version
+
+- [[T4B08]] (B)
+What is the advantage of having multiple receive bandwidth choices on a multimode transceiver? #card
+	- A. Permits monitoring several modes at once by selecting a separate filter for each mode
+	- B. Permits noise or interference reduction by selecting a bandwidth matching the mode
+	- C. Increases the number of frequencies that can be stored in memory
+	- D. Increases the amount of offset between receive and transmit frequencies
+
+- [[T4B09]] (C)
+How is a specific group of stations selected on a digital voice transceiver? #card
+	- A. By retrieving the frequencies from transceiver memory
+	- B. By enabling the group’s CTCSS tone
+	- C. By entering the group’s identification code
+	- D. By activating automatic identification
+
+- [[T4B10]] (C)
+Which of the following receiver filter bandwidths provides the best signal-to-noise ratio for SSB reception? #card
+	- A. 500 Hz
+	- B. 1000 Hz
+	- C. 2400 Hz
+	- D. 5000 Hz
+
+- [[T4B11]] (A)
+Which of the following must be programmed into a D-STAR digital transceiver before transmitting? #card
+	- A. Your call sign
+	- B. Your output power
+	- C. The codec type being used
+	- D. All these choices are correct
+
+- [[T4B12]] (D)
+What is the result of tuning an FM receiver above or below a signal’s frequency? #card
+	- A. Change in audio pitch
+	- B. Sideband inversion
+	- C. Generation of a heterodyne tone
+	- D. Distortion of the signal’s audio