Thanks for checking in, Richard.

Please refresh my admittedly fuzzy memory from 40+ years ago. Did they (RCA) not adjust the phase delay by using
different lengths of dielectric in the inside between adjacent sets of slots? Allowing one size (per channel) of
radiator, but allowing selection of downtilt after machining of the exterior. Or was that Dielectric's design? And,
that particular antenna never worked to expectations, and I always said I thought it had too much tilt. And indeed it
had an extremely strong signal on the ground near the tower. Much more than any other installation I ever visited.

P1-9-1324 back then.

--
Crazy George
The attglobal.net address is a SPAM trap. Please change that part to: attdotbiz properly formatted.

The interior of the VHF TW antenna essentially is a 50 ohm center conductor
against the ID of the pylon. Beam tilt is done by the location of the slots
on the pylon. The useful part of the elevation pattern of these antennas
is made very smooth (no sharp nulls), and it produces fairly uniform fields
near the ground from close to the tower base on out toward the radio
horizon.

The antenna was designed by RCA (Gibbsboro), and the design and production
facilities for it were acquired from them by Dielectric when RCA folded in
the mid-1980s.

As for the effects of beam tilt, Figure 1 in paper #9 at http://rfry.com
gives a graphical representation and discussion of what can be expected.

P1-8-3246 (1950s).

RF

"Richard Fry" wrote
As for the effects of beam tilt, Figure 1 in paper #9 at http://rfry.com
gives a graphical representation and discussion of what can be expected.
_______

Sorry, the * CORRECT * URL that should show above is http://rfry.org .

RF

Richard Fry wrote:
"Richard Fry" wrote

As for the effects of beam tilt, Figure 1 in paper #9 at
http://rfry.com gives a graphical representation and discussion of
what can be expected.

_______

Sorry, the * CORRECT * URL that should show above is http://rfry.org .
RF

It would be nice if you knew your own domain.

Better if you actually pointed at the URL which has your answer to the
question instead of a list of things which don't have a title of "Figure
1 in paper #9"

tom
K0TAR

Maybe I have a subconcious ".com envy?" The URL points to the entry page
leading to all the papers on the website. Paper 9 is easy to find in the
numbered list on the "Papers" page, and the others listed there might
interest some. That was my thinking, anyway.

RF