About Us

Turdey. · October 29th 14, 07:47 AM posted to rec.radio.amateur.antenna

Wrote in message:
gareth wrote:
Any small part of an antenna radiates a little bit and also acts as a
transmission
line to feed power onto the next small bit which behaves similarly.

Nope.

Therefore, it stands to reason that an antenna that is shorter than another
antenna radiates less than does that other antenna.

Since your original premise is false, the conclusion is nonsense.

(Note that despite the abusive and infantile interjections from a certain
quarter, that I am not discussing feeding, nor am I discussing impedance
matching, and neither have I ever been discussing them. Also, I understand
very well the behaviour of transmission lines, complex conjugate matching,
and
radiation by accelerated charges. What I am musing on
is the behaviour of antennae once the power has been fed to it, and that
further
musing is motivated by that full underlying comprehension. I do not
understand
why that infantile quarter tries to accuse me of not understanding those
topics, when
I have never made them the focus of my discussion)

Because you make nonsense statements like the very first sentence of
this post then attempt to come to a conclusion based on that nonsense.

Remember that EZ-NEC does its analysis by dividing up antennae into small
segments
and calculates the antenna performance in certain directions by summing
together all
the individual contributions to the far field.

It is EZNEC, not EZNEC, and EZNEC is a wrapper around a NEC engine.

All implementations of NEC use the same method in the engine but not
all implementations of NEC are EZNEC.

EZNEC is a copywrited commercial product.

NEC calculates the various parameters of an antenna by breaking it into
small segments which are used to perform discrete numerical analysis
of the differential equations that describe all antennas.

It does this because digital computers can not solve continuous differential
equations directly and a specialized analog computer that could would be
too expensive to build these days.

That EZ-NEC works by
calculating a big
result from lots of little results is itself an indication that little bits
of antenna do not
radiate as well as do big bits, viz, short antennae do not radiate as well
as do big antennae.

As a NEC engine does not work as you describe, your premise is false,
your logic is puerile and your conclusion is nonsense.

And there is no such thing as EZ-NEC as you have been told several times
now, you babbling old fool.

--
Jim Pennino

Don't hold back Jim, tell him straight....
--

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