Article View: sci.electronics
Article #4151Re: naive question about RF propagation
From: Bob Myers
Date: Mon, 15 Jan 1990 19:06
Date: Mon, 15 Jan 1990 19:06
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>We all know that AM broadcast radio fades when you drive under a bridge
>but FM doesn't tend to nearly as much. Why is this? Does RF at the FM
>broadcast frequencies propagate better? I thought the higher the frequency,
>the more it exhibited "line of sight" behavior. Or is it because AM
The "higher frequency = more line of sight" is basically correct, but it's
also true that the higher the frequency, the shorter the wavelength - and
shorter-wavelength EM waves can "get around" edges and "into" semi-enclosed
spaces better than their longer cousins. (Think of waveguides, etc..)
Bob Myers KC0EW HP Graphics Tech. Div.| Opinions expressed here are not
Ft. Collins, Colorado | those of my employer or any other
myers%hpfcla@hplabs.hp.com | sentient life-form on this planet.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!pasteur!ucbvax!hplabs!hpfcso!hpfcdj!myers From: myers@hpfcdj.HP.COM (Bob Myers) Newsgroups: sci.electronics Subject: Re: naive question about RF propagation Message-ID: <17660043@hpfcdj.HP.COM> Date: 15 Jan 90 19:06:10 GMT References: <28774@amdcad.AMD.COM> Organization: Hewlett Packard -- Fort Collins, CO Lines: 14