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Old February 15th 10, 09:52 PM posted to rec.radio.amateur.antenna
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Default Zepp antenna the ultimate OCF?

On Mon, 15 Feb 2010 16:25:12 -0500, Michael Coslo
wrote:

Is this the ultimate waaayyy off center dipole? I'm assuming the
feedline radiates a LOT.


Hi Mike,

For one, as we understand a Zepp, it is very long in relation to
wavelength. This means at some frequency it is a Hi Z resonance we
are feeding and hence a very small current. As current is generally
regarded as the indicator of radiation, any pigtail (that portion of
the remaining off-center) would barely contribute at all.

However, for what we understand to be a Zepp, there is no pigtail;
except, perhaps, the transmitter itself as the Zepp is classically fed
from the antenna connector (or the plate tank). This, of course,
gives rise to RF being in the shack and all the concomittant problems
that follow from that. (How in the world did they ever come to this
design in a hydrogen filled balloon? Such is the anachronism of
naming conventions, actual dimensions, history, and the Hindenburg.)

To return to your question, yes, the Zepp is the degenerate form of an
OCF dipole.

73's
Richard Clark, KB7QHC
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