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#11
July 1st 07, 11:54 PM
posted to sci.electronics.basics,rec.radio.shortwave,rec.radio.amateur.antenna,alt.cellular.cingular,alt.internet.wireless
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AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-lowcarrier frequency
Jeff Liebermann wrote:
40KHz thru 285Khz? Great idea. Just one minor problem. A 1/4 wave antenna at about 100Khz frequency is 750 meters long. That's going to be a rather large antenna for literally dragging behind you. Well, your math is correct. However, the so-called "atomic" wrist watches receive their time signal from WWVB which transmits at 60kHz. How do they get that 1250 meter long antenna ( 1/4 wave at 60 kHz) inside that itty bitty wrist watch case? ;-) |
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