E7E10
1. How does a diode envelope detector function?
E1F10
2. Who may be the control operator of an auxiliary station?
E2E06
3. What is the length of an FT8 transmission cycle?
E4E07
4. Which of the following can cause shielded cables to radiate or receive interference?
E1A10
5. If an amateur station is installed aboard a ship or aircraft, what condition must be met before the station is operated?
E7B03
6. What circuit is required at the output of an RF switching amplifier?
E7H01
7. What are three common oscillator circuits?
E8B10
8. What is frequency division multiplexing (FDM)?
E6C09
9. What is used to design the configuration of a field-programmable gate array (FPGA)?
E6A02
10. Which of the following semiconductor materials contains excess free electrons?
E7D03
11. What device is used as a stable voltage reference?
E7C01
12. How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?
E3C07
13. Which of the following indicates the greatest solar flare intensity?
E9G11
14. In what units are the wavelength scales on a Smith chart calibrated?
E4B08
16. Which of the following can be used to determine the Q of a series-tuned circuit?
E7A11
17. What does "positive logic" mean in reference to logic devices?
E9D06
18. What happens to SWR bandwidth when one or more loading coils are used to resonate an electrically short antenna?
E8A05
19. What is the benefit of making voltage measurements with a true-RMS calculating meter?
E5B05
20. What is the effect on the magnitude of pure reactance when it is converted to susceptance?
E5A02
21. What is the resonant frequency of an RLC circuit if R is 22 ohms, L is 50 microhenries, and C is 40 picofarads?
E2A07
22. Which of the following types of signals can be relayed through a linear transponder?
E9C02
23. What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/4- wavelength apart and fed 90 degrees out of phase?
E1B04
24. What must the control operator of a repeater operating in the 70-centimeter band do if a radiolocation system experiences interference from that repeater?
E7G03
25. What is the typical input impedance of an op-amp?
E9B11
26. What is a disadvantage of decreasing the number of wire segments in an antenna model below 10 segments per half-wavelength?
E9A06
27. What is the effective radiated power (ERP) of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?
E3B13
28. What type of polarization is supported by ground-wave propagation?
E8C04
29. What technique minimizes the bandwidth of a PSK31 signal?
E4C10
30. What is an advantage of having a variety of receiver bandwidths from which to select?
E2B10
31. What aspect of an analog slow-scan television signal encodes the brightness of the picture?
E6D11
32. Which type of core material decreases inductance when inserted into a coil?
E3A03
33. When scheduling EME contacts, which of these conditions will generally result in the least path loss?
E5C01
34. Which of the following represents pure capacitive reactance of 100 ohms in rectangular notation?
E1E09
35. What may be the penalty for a VE who fraudulently administers or certifies an examination?
E8D09
36. What is considered an acceptable maximum IMD level for an idling PSK signal?
E5D06
37. What parasitic characteristic creates an inductor's self-resonance?
E1D12
38. Which of the following amateur stations may transmit one-way communications?
E7F09
39. Why is an anti-aliasing filter required in a decimator?
E9H10
40. How can the output voltage of a multiple-turn receiving loop antenna be increased?
E9F02
41. Which of the following has the biggest effect on the velocity factor of a transmission line?
E6B08
42. Which of the following is a Schottky barrier diode?
E2C08
43. Which of the following contacts may be confirmed through the Logbook of The World (LoTW)?
E6F03
44. What is the most common configuration of an optoisolator or optocoupler?
E0A08
45. What does SAR measure?
E4A06
46. What is the effect of aliasing on a digital oscilloscope when displaying a waveform?
E4D06
47. What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?
E6E08
48. How is power supplied to the most common type of MMIC?
E9E05
49. What Yagi driven element feed point impedance is required to use a beta or hairpin matching system?
E2D02
50. What information replaces signal-to-noise ratio when using the FT8 or FT4 modes in a VHF contest?
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