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(a) How should you orient the axis of the receiver's loopstick to maximize the signal from station A and minimize it from station B? (b) If you were lost on a large lake surrounded by radio stations at known locations, how could you use a loopstick-equipped radio (no GPS!) as a direction finder?

(a) How should you orient the axis of the receiver's loopstick to maximize the signal from station A and minimize it from station B? (b) If you were lost on a large lake surrounded by radio stations at known locations, how could you use a loopstick-equipped radio (no GPS!) as a direction finder?

Introductory Circuit Analysis (13th Edition)
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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VDC + Rp C₁ R₁ L₁ : C₂ AC R₂ 22 10VP Vp B FIGURE 12.23 Equivalent circuits of battery power supply, two bypass capacitors, and power-supply load for Problem 12.10. of the loopstick. Most long-wave signals are oriented (polarized) so that the electric field is vertical (perpendicular to ground) and the magnetic field is horizontal (parallel to the ground). Suppose you wish to receive a signal from an AM broadcast-band station A that is located due north of your receiver. An interfering station B on the same frequency produces a much stronger wave at your location, and station B is located due east of you. (a) How should you orient the axis of the receiver's loopstick to maximize the signal from station A and minimize it from station B? (b) If you were lost on a large lake surrounded by radio stations at known locations, how could you use a loopstick-equipped radio (no GPS!) as a direction finder?
Transcribed Image Text:VDC + Rp C₁ R₁ L₁ : C₂ AC R₂ 22 10VP Vp B FIGURE 12.23 Equivalent circuits of battery power supply, two bypass capacitors, and power-supply load for Problem 12.10. of the loopstick. Most long-wave signals are oriented (polarized) so that the electric field is vertical (perpendicular to ground) and the magnetic field is horizontal (parallel to the ground). Suppose you wish to receive a signal from an AM broadcast-band station A that is located due north of your receiver. An interfering station B on the same frequency produces a much stronger wave at your location, and station B is located due east of you. (a) How should you orient the axis of the receiver's loopstick to maximize the signal from station A and minimize it from station B? (b) If you were lost on a large lake surrounded by radio stations at known locations, how could you use a loopstick-equipped radio (no GPS!) as a direction finder?
Orientation of victim and electromagnetic-wave EMI. The rule that an antenna must be a few percent of a wavelength long to operate effectively becomes a problem with long-wave signals (below 3 MHz), where the wavelengths exceed 100 m. As a result, some radios receive only the magnetic field associ- ated with the radiated wave, because magnetic-field pickup devices can be much smaller than a wavelength and still operate reasonably well. One way this is done is with a type of antenna called a loopstick, which is basically a long cylindrical magnetic core inside a coil of wire. The loopstick antenna is sensitive only to the component of the magnetic field that is parallel to the axis
Transcribed Image Text:Orientation of victim and electromagnetic-wave EMI. The rule that an antenna must be a few percent of a wavelength long to operate effectively becomes a problem with long-wave signals (below 3 MHz), where the wavelengths exceed 100 m. As a result, some radios receive only the magnetic field associ- ated with the radiated wave, because magnetic-field pickup devices can be much smaller than a wavelength and still operate reasonably well. One way this is done is with a type of antenna called a loopstick, which is basically a long cylindrical magnetic core inside a coil of wire. The loopstick antenna is sensitive only to the component of the magnetic field that is parallel to the axis
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