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The Terminator
Interior and Exterior Body & Chassis
Removing the hood blanket and AM radio reception.
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<blockquote data-quote="03DOHC" data-source="post: 275755" data-attributes="member: 4060"><p>The basic formula for a resonant 1/4 wavelength antenna is 234/freq(mhz). Therefore, 234/90mhz=2.6', which is close to the length of the factory antenna. That's close enough to work for frequencies you receive in the FM band, but would be way too short for AM reception. There has to be some method of inductive loading to get the AM band. Exactly how they do it, I don't know.</p><p></p><p>If you've ever taken apart an AM radio you'll see a ferrite bar wrapped with copper wire. That would be an inductive loaded antenna. It's a method of achieveing resonance. The factory antenna is what is called a resonant antenna, which means it's length alone is sufficient for reception.</p><p></p><p>I've built quite a few antenna's in my time, so that's why I know something about them.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="03DOHC, post: 275755, member: 4060"] The basic formula for a resonant 1/4 wavelength antenna is 234/freq(mhz). Therefore, 234/90mhz=2.6', which is close to the length of the factory antenna. That's close enough to work for frequencies you receive in the FM band, but would be way too short for AM reception. There has to be some method of inductive loading to get the AM band. Exactly how they do it, I don't know. If you've ever taken apart an AM radio you'll see a ferrite bar wrapped with copper wire. That would be an inductive loaded antenna. It's a method of achieveing resonance. The factory antenna is what is called a resonant antenna, which means it's length alone is sufficient for reception. I've built quite a few antenna's in my time, so that's why I know something about them.:D [/QUOTE]
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The Terminator
Interior and Exterior Body & Chassis
Removing the hood blanket and AM radio reception.
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