G8B01:

Which mixer input is varied or tuned to convert signals of different frequencies to an intermediate frequency (IF)?

  1. Image frequency
  2. Local oscillator
  3. RF input
  4. Beat frequency oscillator

G8B02:

If a receiver mixes a 13.800 MHz VFO with a 14.255 MHz received signal to produce a 455 kHz intermediate frequency (IF) signal, what type of interference will a 13.345 MHz signal produce in the receiver?

  1. Quadrature noise
  2. Image response
  3. Mixer interference
  4. Intermediate interference

G8B03:

What is another term for the mixing of two RF signals?

  1. Heterodyning
  2. Synthesizing
  3. Cancellation
  4. Phase inverting

G8B04:

What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?

  1. Mixer
  2. Reactance modulator
  3. Pre-emphasis network
  4. Multiplier

G8B05:

What is the approximate bandwidth of a PACTOR-III signal at maximum data rate?

  1. 31.5 Hz
  2. 500 Hz
  3. 1800 Hz
  4. 2300 Hz

G8B06:

What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?

  1. 3 kHz
  2. 5 kHz
  3. 8 kHz
  4. 16 kHz

G8B07:

What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?

  1. 101.75 Hz
  2. 416.7 Hz
  3. 5 kHz
  4. 60 kHz

G8B08:

Why is it important to know the duty cycle of the mode you are using when transmitting?

  1. To aid in tuning your transmitter
  2. Some modes have high duty cycles that could exceed the transmitter's average power rating
  3. To allow time for the other station to break in during a transmission
  4. The attenuator will have to be adjusted accordingly

G8B09:

Why is it good to match receiver bandwidth to the bandwidth of the operating mode?

  1. It is required by FCC rules
  2. It minimizes power consumption in the receiver
  3. It improves impedance matching of the antenna
  4. It results in the best signal-to-noise ratio

G8B10:

What is the relationship between transmitted symbol rate and bandwidth?

  1. Symbol rate and bandwidth are not related
  2. Higher symbol rates require wider bandwidth
  3. Lower symbol rates require wider bandwidth
  4. Bandwidth is always half the symbol rate

G8B11:

What combination of a mixer's Local Oscillator (LO) and RF input frequencies is found in the output?

  1. The ratio
  2. The average
  3. The sum and difference
  4. The arithmetic product

G8B12:

What process combines two signals in a non-linear circuit or connection to produce unwanted spurious outputs?

  1. Intermodulation
  2. Heterodyning
  3. Detection
  4. Rolloff