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
Two Amateur Radio microwave enthusiasts in Australia are claiming a new distance record on 10 GHz. On January 5, during a tropo opening across the G... Read more
The existing 122GHz and 241GHz UK distance records were both extended to new distance of 6.8km with two-way contacts in CW from John Hazell G8A... Read more
By Laura Camper, Star Staff Writer – Ham radio in Cleburne ready for disaster: Read more
In this video from Pacificon 2021, Marcus Gilson, AK7MG talks about his product, Remote TX, a way of remotely operating your radio from anywhere in th... Read more
QRM Eliminator Troubled by local noise / QRM from neighbours on the HF bands? Maybe the X-Phase QRM Eliminator is worth a try.. Several manufacturers... Read more
Vintage Radio If you were a radio nerd in the 1940s, this was your dream set. Built by Kluge Electronics in Los Angeles, the “California Kilowatt” cou... Read more
WEST CHESTER, Ohio – In the era of cell phones and the internet, oftentimes the aftermath of a hurricane can include a catastrophic loss of comm... Read more
HOLYLAND CONTEST 2016 Friday 15 of April 21.00UTC – Saturday 16 of April 2016 21.00UTC The Aim: To promote contacts between Radio Amateurs aroun... Read more
Two satellites with Amateur Radio transponder payloads have been selected for future NASA launches. AMSAT reports that the TJREVERB CubeSat, developed... Read more
Recent Posts
New World Record Claimed on 10 GHz
New 122GHz and 241GHz UK distance records
Ham radio in Cleburne ready for disaster
Remote TX – HRO at Pacificon 2021
The QRM Eliminator to the Rescue
This Is The Coolest Vintage Radio Ever
Ham radio operators could play important role in potential Hurricane Florence disaster
HOLYLAND CONTEST 2016
Two Amateur Radio CubeSats Carrying Transponders Set for Future NASA Launches
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Famplitude-modulation-fundamentals-by-pa2old%2F): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in /home/qrznow/public_html/wp-content/themes/goodnews5/framework/functions/posts_share.php on line 151
