Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol RF Superstore San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!
RF Superstore (RF Components) - RF Cafe

Module 12 - Modulation Principles
Navy Electricity and Electronics Training Series (NEETS)
Chapter 2:  Pages 2-61 through 2-64

Module 12 − Modulation Principles

Pages i, 1−1, 1−111−21, 1−31, 1−41, 1−51, 1−61, 1−71, 2−1, 2−11, 2−21, 2−31, 2−41, 2−51, 2−61, 3−1, 3−11, 3−21, 3−31, AI−1, Index, Assignment 1, 2

THYRATRON MODULATOR

 

In communications PULSE-MODULATION Systems, the modulating wave must be SAMPLED at 2.5 times the highest modulating frequency to ensure accuracy.

PULSE-Amplitude MODULATION (PAM) is modulation in which the amplitude of each pulse is controlled by the instantaneous amplitude of the modulation signal at the time of each pulse.

PULSE-Amplitude MODULATION (PAM)

 

PULSE-DURATION MODULATION (PDM) or PULSE-WIDTH MODULATION (PWM) are both designations for a type of modulation. The width of each pulse in a train is made proportional to the instantaneous value of the modulating signal at the instant of the pulse.

PULSE-POSITION MODULATION (PPM) has the advantage of requiring constant transmitter power. The amplitude and width of the pulses are kept constant. At the same time, the position of each pulse, in relation to the position of a recurrent reference pulse, is varied by each instantaneous sampled value of the modulating wave.

2-61

PULSE-POSITION MODULATION (PPM)

 

PULSE-Frequency MODULATION (PFM) is a method of pulse modulation in which the modulating wave is used to frequency modulate a pulse-generating circuit.

PULSE-Code MODULATION (PCM) refers to a system in which the standard value of a quantized wave is indicated by a series of coded pulses that give the modulating wave's value at the instant of the sample.

 

PULSE-Code MODULATION (PCM)

2-62

 

Answers to Questions Q1. Through Q29.

 

A-1. Frequency and phase.

A-2. Frequency-shift keying.

A-3. Resistance to noise interference.

A-4. Instantaneous frequency.

A-5. As the ratio of the frequency deviation to the maximum frequency deviation allowable.

A-6. The number of significant sidebands and the modulating frequency.

A-7. By changing the reactance of an oscillator circuit in consonance with the modulating voltage.

A-8. Collector-to-emitter capacitance.

A-9. An LCR filter. A-10. Capacitance.

A-11. Phase.

A-12. a phase-shift network such as a variable resistor and capacitor in series.

A-13. CW and frequency-shift keying.

A-14. Pulse modulation.

A-15. Pulse-repetition time.

A-16. Rest time.

A-17. Peak power during a pulse averaged over pulse time plus rest time.

A-18. Either a fixed spark gap that uses a trigger pulse to ionize the air between the contacts, or a rotary gap that is similar to a mechanical switch.

A-19. Power source, a circuit for storing energy, a circuit for discharging the storage circuit, and a pulse transformer.

A-20. Some characteristic of the pulses has to be varied.

A-21. 2.5 times the highest modulating frequency.

A-22. Both are susceptible to noise and interference.

A-23. The time duration of the pulses or the time of occurrence of the pulses.

A-24. Either, or both at the same time.

A-25. It requires synchronization between the transmitter and receiver.

A-26. a method of pulse modulation in which a modulating wave is used to frequency modulate a pulse-generating circuit.

2-63

A-27. Quantization.

A-28. 50.

A-29. Low susceptibility to noise.

2-64 

NEETS Modules
- Matter, Energy, and Direct Current
- Alternating Current and Transformers
- Circuit Protection, Control, and Measurement
- Electrical Conductors, Wiring Techniques, and Schematic Reading
- Generators and Motors
- Electronic Emission, Tubes, and Power Supplies
- Solid-State Devices and Power Supplies
- Amplifiers
- Wave-Generation and Wave-Shaping Circuits
- Wave Propagation, Transmission Lines, and Antennas
- Microwave Principles
- Modulation Principles
- Introduction to Number Systems and Logic Circuits
- - Introduction to Microelectronics
- Principles of Synchros, Servos, and Gyros
- Introduction to Test Equipment
- Radio-Frequency Communications Principles
- Radar Principles
- The Technician's Handbook, Master Glossary
- Test Methods and Practices
- Introduction to Digital Computers
- Magnetic Recording
- Introduction to Fiber Optics
Note: Navy Electricity and Electronics Training Series (NEETS) content is U.S. Navy property in the public domain.
Exodus Advanced Communications Best in Class RF Amplifier SSPAs - RF Cafe
Windfreak Technologies Frequency Synthesizers - RF Cafe
RF Electronics Shapes, Stencils for Office, Visio by RF Cafe
Innovative Power Products Passive RF Products - RF Cafe
KR Electronics (RF Filters) - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free

 

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

AirplanesAndRockets.com