Amplitude Modulation Fundamentals by PA2OLD

In the modulation process, the baseband voice, video, or digital signal modifies
another, higher-frequency signal called the carrier, which is usually a sine wave.
A sine wave carrier can be modified by the intelligence signal through amplitude
modulation, frequency modulation, or phase modulation. The focus of this
chapter is amplitude modulation (AM).
Objectives
After completing this chapter, you will be able to:
■ Calculate the modulation index and percentage of modulation of an AM
signal, given the amplitudes of the carrier and modulating signals.
■ Define overmodulation and explain how to alleviate its effects.
■ Explain how the power in an AM signal is distributed between the carrier
and the sideband, and then compute the carrier and sideband powers,
given the percentage of modulation.
■ Compute sideband frequencies, given carrier and modulating signal
frequencies.
■ Compare time-domain, frequency-domain, and phasor representations of
an AM signal.
■ Explain what is meant by the terms DSB and SSB and state the main
advantages of an SSB signal over a conventional AM signal.
■ Calculate peak envelope power (PEP), given signal voltages and load
impedances….

Read Full Article in .pdf 

Recent Posts

“Enigma Reloaded” Ham Radio Event Celebrates World War II Cipher Machine

September 15, 2016 No comments

Enigma Reloaded 2016, September 17 to October 1, will promote Amateur Radio and celebrate the history of the Enigma cipher machine and its crucial rol... Read more

Green Heron Rotator Controller RT-21azel

October 02, 2014 No comments

Rotator Controller RT-21 Azimuth/Elevation Two separate control boards for independent Azimuth and Elevation New crisp OLED displays Separate Point-an... Read more

Nepal Now Has a Second VHF Repeater in Operation

May 23, 2015 No comments

  A VHF repeater that had been held up in customs in Nepal during the response to the April 25 magnitude 7.8 earthquake now has been installed at... Read more

Global QSL – How it works?

January 21, 2017 No comments

How it works? Due to technical improvements in the printing industry, and “high tech” modern technology and facilities used by Global QSL,... Read more

AmateurLogic 84: Windows Pi

November 13, 2015 No comments

George demonstrates Windows 10 on the Raspberry Pi. Tommy talks about DHAP RF Commander. Peter builds the Pixie kit and has a few highlights from the... Read more

ARISS Postpones Anniversary SSTV Event

December 22, 2015 No comments

The Amateur Radio on the International Space Station (ARISS) Slow-Scan TV event set for December 26-27 has been postponed due to “complications in pla... Read more

YouKits HB1B upgrade

January 06, 2015 No comments

  “RadioSet-GO, your source for unique, trail friendly QRP radio designs; simple, efficient, portable, and attractive all-in-one low power... Read more

Ham Radio will be Represented at 9th Annual World Maker Faire in New York City

September 06, 2018 No comments

he Garden School (K2GSG) and Hall of Science Amateur Radio clubs (ARC) in New York City will join forces this month to put Amateur Radio on display du... Read more

Arduino Mega2560 based Antenna Rotator Controller

June 08, 2016 No comments

by Vinod Es “Well after a long time I am back with a new project ! This is an attempt to build an Antenna rotator controller using Arduino Mega... Read more