CORRELATION 2 - EST 1-50 P.B

• Part of the carrier varied by intelligence during modulation in an AM system: AMPLITUDE
• Difference between the RF carrier and the modulating signal frequencies: LSB
• Stage in a radio transmitter that isolates the oscillator from the load: BUFFER
• Frequency of the unmodulated carrier in an FM system: CENTER FREQUENCY
• Ratio of maximum deviation to the maximum modulating frequency: DEVIATION RATIO
• Carrier signal frequency in FM system: 20 kHz and above
• Effect on maximum deviation in FM system if modulation index is doubled by having the modulating frequency: NO EFFECT
• Maximum sideband suppression value using filter system is 50 dB
• Modulation index determines the number of sideband components in FM
• H3E transmits only one sideband
• Baseband frequency produces the sidebands on FM
• Spectrum analyzer displays the carrier and the sidebands amplitude with frequency to frequency
• Mixer is also known as a converter
• A3H emission transmits the lower sideband and half of the upper sideband
• An FM receives signal vary in frequency with modulation
• The process of impressing intelligence on the carrier is called modulation
• Spectrum analyzer is an electronic instrument used to show both the carrier and the sidebands of a modulated signal in the frequency domain
• Indirect method of generating FM:

  • ARMSTRONG SYSTEM
• To generate an SSB or DSB signal, use a circuit known as:

  • BALANCED MODULATOR
• First radio receiver:

  • CRYSTAL RADIO RECEIVER
• Interfering signal with a frequency equal to the received signal plus twice the IF is called:

  • IMAGE FREQUENCY
• Double sideband full carrier emission type:

  • A3E
• Single sideband reduced carrier emission type:

  • R3E
• Single sideband suppressed carrier emission type:

  • J3E
• Independent sideband emission type:

  • B8E
• Vestigial sideband emission type:

  • C3F
• Single sideband full carrier emission type:

  • H3E
• Phase modulation emission type:

  • G3E
• Not an advantage of SSB over AM:

  • BETTER FIDELITY
• Advantage of a high-level modulated AM transmitter:

  • HIGHER VALUE OF OPERATING POWER
• Advantage of a low-level modulated AM transmitter:

  • LESS AUDIO POWER REQUIRED
• Bad effect caused by overmodulation in AM transmission:

  • INTERFACE TO OTHER RADIO SERVICES
• Characteristic of a radio receiver that refers to its ability to reject an unwanted signal:

  • SELECTIVITY
• Type of emission for frequency modulation:

  • F3E
• AM transmission power increases with:

  • MODULATION
• What locks the FM receiver to a stronger signal:

  • CAPTURE EFFECT
• Highest percentage of modulation for AM:

  • 100%
• Carson’s Rule in FM states that the bandwidth is equal to twice the sum of the modulating frequency and:

  • FREQUENCY DEVIATION
• Carrier swing of an FM transmitter when modified by 75%:

  • 112.5 kHz
• Modulation system inherently more resistant to noise:

  • FREQUENCY MODULATION