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February 6th 09, 08:24 PM
posted to rec.radio.amateur.antenna
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Receiving Loop Antenna Question
On Wed, 4 Feb 2009 00:12:54 -0800, "Sal M. Onella"
wrote: "JosephKK" wrote in message news  On Sun, 25 Jan 2009 14:27:33 -0800 (PST), wrote: snip You might be surprised just how much level you can get from a tuned small loop on the low bands. As an example, that 16 inch loop provides more signal than the whip on a car. I once tried it with a delco radio in my truck. I hooked the loop up to it, and it was as hot as a firecracker vs the standard whip. The catch is the system is very high Q, and requires constant tuning of the cap as you change frequency. That bites you when you use resonant loops. Of course non-resonant loops don't have nearly the effective performance. Initial selectivity to reduce the noise bandwidth before amplification or mixing is why it is so common. I recall medium-size table radios having a loop antenna in/on the back cover. I don't know whether there was also a ferrite rod inside. There was not one in the clock radio that i grew up with. I know, i had it apart by the time i was ten. |
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