# Amateur Wireless Station Operators License Exam

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1 Amateur Wireless Station Operators License Exam Study material 2017 South India Amateur Radio Society, Chennai CHAPTER 5 1 Chapter 5 Amateur Wireless Station Operators License Exam Study Material

3 A simple FM transmitter/fm bug The schematic diagram of an FM room bug/transmitter is given below. How does this Transmitter Work? The variable capacitor and your inductor will oscillate at frequencies in the FM radio band (88 to 108 MHz). The electret microphone has a resistance that depends on how loudly you speak into it. This microphone is battery powered and according to the V=IR Ohm's Law, changes in resistance for fixed voltage will result in proportional changes in current. This current feeds into the base of the 2N2222 NPN transistor which is connected to your variable capacitor, inductor and antenna. The net effect is that depending on your variable capacitor's value, your voice will be modulated to transmit at a frequency between 88 and 108 MHz. If a nearby pocket FM radio is tuned to this frequency, you'll be heard when speaking into your transmitter. 3 Chapter 5 Amateur Wireless Station Operators License Exam Study Material

7 Multiple Choice Questions 1. If a dial marked in megahertz shows a reading of MHz, what would it show if it were marked in kilohertz? a) khz b) 3525 khz c) khz d) khz Mega is a million, kilo is a thousand. A Megahertz is a thousand kilohertz. Converting from Megahertz to kilohertz, from large units to smaller, requires more digits, decimal point moves to the right by three positions, a thousand times more. 2. One megahertz is equal to: a) khz b) 100 khz c) Hz d) 10 Hz Mega is a million, kilo is a thousand. Converting from Megahertz to kilohertz, from large units to smaller, requires more digits, decimal point moves to the right by three positions, a thousand times more. 3. What is the name for the distance an AC signal travels during one complete cycle? a) Wavelength b) Wave speed c) Waveform d) Wave spread Wavelength: the distance between successive points of equal amplitude and phase on a wave (for example, crest to crest or trough to trough). 4. What happens to a signal's wavelength as its frequency increases? a) It gets longer b) It stays the same c) It disappears d) It gets shorter Wavelength (lambda) in metres is 300 divided by frequency in Megahertz ( i.e., the speed of light divided by the frequency in Hertz ). Wavelength and frequency have an inverse relationship. 5. How fast does a radio wave travel through free space? a) At the speed of light b) At the speed of sound c) Its speed is inversely proportional to its wavelength d) Its speed increases as the frequency increases 6. What are the frequency limits of the VHF spectrum? a) 30 to 300 khz b) 30 to 300 MHz c) 300 to 3000 khz d) 300 to 3000 Mhz 7. What are the frequency limits of the UHF spectrum? a) 30 to 300 khz b) 30 to 300 MHz c) 300 to 3000 khz d) 300 to 3000 MHz 7 Chapter 5 Amateur Wireless Station Operators License Exam Study Material

8 8. What frequency range is referred to as HF? a) 300 to 3000 Mhz b) 30 to 300 MHz c) 3 to 30 MHz d) 300 to 3000 khz 9. Which of the following is a form of amplitude modulation? a) Spread-spectrum b) Packet radio c) Single sideband d) Phase shift keying 10. What type of modulation is most commonly used for VHF packet radio transmissions? a) FM b) SSB c) AM d) Spread Spectrum T 11. Which type of voice modulation is most often used for long-distance or weak signal contacts on the VHF and UHF bands? a) FM b) AM c) SSB d) PM 12. Which type of modulation is most commonly used for VHF and UHF voice repeaters? a) AM b) SSB c) PSK d) FM 13. Which of the following types of emission has the narrowest bandwidth? a) FM voice b) SSB voice c) CW d) Slow-scan TV 14. Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications? a) Upper sideband b) Lower sideband c) Suppressed sideband d) Inverted sideband 15. What is the primary advantage of single sideband over FM for voice transmissions? a) SSB signals are easier to tune b) SSB signals are less susceptible to interference c) SSB signals have narrower bandwidth d) All of these choices are correct 8 Chapter 5 Amateur Wireless Station Operators License Exam Study Material

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