An average-reading power meter is connected to the input circuit of a transmitter. The transmitter output is fed into a 75-2 resistive load, and the wattmeter reads 67 W. a) what is the power in dBm units? b) what is the power in dBk units? c) what is the power in dBmV units? rive

An average-reading power meter is connected to the input circuit of a transmitter. The transmitter output is fed into a 75-2 resistive load, and the wattmeter reads 67 W. a) what is the power in dBm units? b) what is the power in dBk units? c) what is the power in dBmV units? rive

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Amplitude modulation

A radio signal can carry information in the form of sound or image for broadcasting or communication. For it to be sent to a greater distance, the signal must be changed or modulated in some way. One of the easiest way is to change the amplitude of the signal with variations of the video or the audio signal. This is called Amplitude Modulaton. In this modulation information of message is carried in amplitude of carrier signal.

Question

An average-reading power meter is connected to the input circuit of a transmitter. The
transmitter output is fed into a 75-2 resistive load, and the wattmeter reads 67 W.
a) what is the power in dBm units?
b) what is the power in dBk units?
c) what is the power in dBmV units?
Assume that a waveform with known RMS value Vms is applied across a 50-2 load. Derive a
formula that can be used to compute the dBm value from Vms
!!

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