On 22 Apr, 15:55, "Jimmie D" wrote:
"Richard Harrison" wrote in message

...





Art wrote:
"Again, Richard you are taking things out of context since the arrays
referred to were not in equilibrium.'

I noted no acceleration nor motion. As a firm believer in the
conservation of energy I`m sure that the antenna, on average, received
no more energy than it emitted or conducted away. That is balance or
equilibrium.

Art also wrote:
"Terman was referring to close spaced of the parasitic form, even
mentions corner reflectors."

Yes, and he also mentions the Yagi array. But I believe Terman meant to
say the best antenna gains of the day, for the antenna`s size,
regardless of direct or parasitic drive, were obtained from corner
reflector and Yagi antennas. That hasn`t changed but it certainly may.
But, Kraus, whose invention, the W8JK array, has two dipole elements
spaced 0.125 wavelengths apart and driven 180-degrees out of phase,
certainly has no parasitic element. That was certainly on his mind when
he wrote the comments on page 185 in "Antennas". On the facing page,
184, he diagrams two antennas, the W8JK and a stack of two dipoles which
are driven in-phase, not out-of phase like the W8JK.

Low radiation resistance is a consequence of tight coupling between the
closely-spaced elements. This makes the coupling to the array likely
lossy in making impedance transformations necessary to match the array
to the transmission line. Kraus has some suggestions on how to make
these arrays more compatible with their transmission lines.

Best regards, Richard Harrison, KB5WZI

I f this were a hospital you couldnt distinguish the doctors from the
patients.. LMAO

Jimmie- Hide quoted text -

- Show quoted text -

Jimmie you may reach the same age as Richard( you are nearly 80 years
old aren't you) so you better start thinking ahead. There are
different types of institutions you know and who knows what type you
are assigned to.
Art