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

Making contacts through the ISS APRS UHF Digipeater [ Video ]

December 30, 2016 No comments

  John Brier KG4AKV has released a video showing his contact through the International Space Station packet radio digipeater on 437.550 MHz FM (+... Read more

Yaesu FT-DX101D/MP [ English Brochure ]

November 26, 2018 No comments

Yaesu FT-DX101D/MP The new FTDX101D is utilizing the latest SDR Technology and classified as our High-End HF line, the FTDX series, which amateurs hav... Read more

EP6T Team Pleads for “More Respect” from Operators

January 22, 2015 No comments

“The EP6T DXpedition team now on Iran’s Kish Island (IOTA AS-166) has implored operators hoping to work the rare DXCC entity to show more respec... Read more

Orlando Hamcation Walk-n-Talk – Ham Radio 2.0

March 08, 2017 No comments

During the Orlando Hamcation, Gary Pearce and I walked around and spoke to some of the vendors and booth-holders at the show. This is the presentation... Read more

Ham Radio Deluxe Blacklist Official Apology

January 07, 2017 No comments

Dr. Michael Carper, Co-Owner, HRD Software, LLC Open Letter to Our Customers Valued customers: I’ve received many questions from our customers and dea... Read more

Review of MFJ’s New Xiegu X5105 HF QRP Deluxo

February 09, 2018 No comments

Review of MFJ’s newest radio. MFJ is the sole importer of the new Xiegu X5105 160m-6m QRP SSB/CW/AM/FM radio with built in rechargeable battery... Read more

Announcing the BTECH GMRS-V1

October 14, 2016 No comments

Announcing the BTECH GMRS-V1 We are excited to announce the most flexible GMRS radio, the BTECH GMRS-V1. The GMRS-V1 includes 23 modifiable channels f... Read more

Achieve Better Efficiency with Your HF Mobile Antenna

June 12, 2016 No comments

via DXengineering Blog Due to their very nature, HF mobile antennas must be physically short compared to their wavelength. In order for them to hear a... Read more

New ! SteppIR SARK-110 Antenna Analyzer

December 28, 2014 No comments

  The SARK-110 is a completely new design concept for an Antenna Analyzer. This is a truly pocket size device, so you can take it anywhere. It of... Read more