E4A01:

Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?

1. Sampling rate of the analog-to-digital converter
2. Amount of memory
3. Q of the circuit
4. All these choices are correct

E4A02:

Which of the following parameters does a spectrum analyzer display on the vertical and horizontal axes?

1. RF amplitude and time
2. RF amplitude and frequency
3. SWR and frequency
4. SWR and time

E4A03:

Which of the following test instruments is used to display spurious signals and/or intermodulation distortion products generated by an SSB transmitter?

1. A wattmeter
2. A spectrum analyzer
3. A logic analyzer
4. A time-domain reflectometer

E4A04:

How is the compensation of an oscilloscope probe typically adjusted?

1. A square wave is displayed and the probe is adjusted until the horizontal portions of the displayed wave are as nearly flat as possible
2. A high frequency sine wave is displayed and the probe is adjusted for maximum amplitude
3. A frequency standard is displayed and the probe is adjusted until the deflection time is accurate
4. A DC voltage standard is displayed and the probe is adjusted until the displayed voltage is accurate

E4A05:

What is the purpose of the prescaler function on a frequency counter?

1. It amplifies low-level signals for more accurate counting
2. It multiplies a higher frequency signal so a low-frequency counter can display the operating frequency
3. It prevents oscillation in a low-frequency counter circuit
4. It divides a higher frequency signal so a low-frequency counter can display the input frequency

E4A06:

What is the effect of aliasing on a digital oscilloscope caused by setting the time base too slow?

1. A false, jittery low-frequency version of the signal is displayed
2. All signals will have a DC offset
3. Calibration of the vertical scale is no longer valid
4. Excessive blanking occurs, which prevents display of the signal

E4A07:

Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?

1. Antenna analyzers automatically tune your antenna for resonance
2. Antenna analyzers do not need an external RF source
3. Antenna analyzers display a time-varying representation of the modulation envelope
4. All these choices are correct

E4A08:

Which of the following measures SWR?

1. A spectrum analyzer
2. A Q meter
3. An ohmmeter
4. An antenna analyzer

E4A09:

Which of the following is good practice when using an oscilloscope probe?

1. Keep the signal ground connection of the probe as short as possible
2. Never use a high-impedance probe to measure a low-impedance circuit
3. Never use a DC-coupled probe to measure an AC circuit
4. All these choices are correct

E4A10:

Which of the following displays multiple digital signal states simultaneously?

1. Network analyzer
2. Bit error rate tester
3. Modulation monitor
4. Logic analyzer

E4A11:

How should an antenna analyzer be connected when measuring antenna resonance and feed point impedance?

1. Loosely couple the analyzer near the antenna base
2. Connect the analyzer via a high-impedance transformer to the antenna
3. Loosely couple the antenna and a dummy load to the analyzer
4. Connect the antenna feed line directly to the analyzer's connector