2648Re: Question About AM Loops
- Oct 2, 2006
> I'm trying to understand this loop thing conceptually. Given theLoops are magnetic field antennas instead of electrostatic field
antennas. The larger the area of the loop, the more lines of magnetic
flux it intercepts. That is why a ferrite bar antenna works - the
ferrite concentrates magnetic flux in what would ordinarily be a loop
that is too small to be effective.
Having never built a beverage antenna for these frequencies due to lack
of space, I can't really speak to why it works. However, I suspect it
is because - even with low gain - it is large enough to intercept the
magnetic flux. It is therefore a great broadband solution, if you have
the land to construct it.
The smaller tuned loops we discuss here take advantage of parallel
resonant bandpass filter characterisitics to have gain.
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