[time-nuts] WWVB BPSK Receiver Project? (fwd)

ehydra ehydra at arcor.de
Sat Mar 17 20:33:02 UTC 2012


In the end every antenna receives the EM wave! The EM-wave is the far
field. The antenna works in the near field where a dominant component
can be the E or M. That depends on the antenna. Between the near and the
far field the field is "converted" and local Z0 highly complicated.

As far as I know every antenna declared as whole EM-capable wasn't it
and I think it is maybe just impossible to couple directly EM to a
antenna <at least if the antenna should be "engineered" which means
simple and cheap>.


The ferrite antenna couples the M component. The vertical capacitive
antenna the E component!
Both can be resonant or broadband.

The ferrite antenna is highly nonlinear and therefor not suitable as
transmitter. As we don't have a "reverse" component for FETs this is
even true for the vertical capacitive antenna.

And a wire antenna in the classical way is a M component antenna. No
ferrites and low Z0 means it can be effectivly used as a transmitting
device.

- Henry


lists at lazygranch.com schrieb:
> The ferrite loop antenna receives the magnetic portion of the EM wave. It doesn't have to be a bandpass LC filter. 
> 
> The Wellbrook loop antennas are one example of a broadband antenna that receives the magnetic portion. 


-- 
ehydra.dyndns.info




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