Hi, all concerned:

www.g3ycc.karoo.net/lattin.html

is the corrected url.

If the dimensions are added up, the overall physical length approaches that
of an 80M dipole. "Loading-effect" of the "fat-wire" dipole could be helped
along if needed on 80M by additional wire length past A.

The A-stubs reduce the electrical lengths each side to overall
40M-dipole-size.

Ditto B-stubs on 20M.

Ditto C-stubs on 15M.

Changing the D-lengths to single wires, or shorting both inner ends,
completes the 10M-dipole section.

Editorial comments:

The feed shown is "incorrect". Stubs at D are not needed, unless one wishes
to add higher-frequency capability. Single wires are sufficient for the 10M
portions of the dipole.

This Lattin antenna is not easily constructed or tuned, and it reminds me of
something from the category of solutions running around looking for
problems.

The current amateur application that I can think of which is done "properly"
is the KLM h-f tribander. The stubs are of open-construction, and the first
stubs, at the outside end the 10M portions of the antenna elements, can be
seen easily, even in pictures.

73, Dave, N3HE


"pegge" wrote in message
...
I´m planning to build a new multi-band antenna, and found something
SNIP

On Sun, 2 Jan 2005 16:03:08 -0500, "David J Windisch"
wrote:

Hi, all concerned:

www.g3ycc.karoo.net/lattin.html

is the corrected url.

If the dimensions are added up, the overall physical length approaches that
of an 80M dipole. "Loading-effect" of the "fat-wire" dipole could be helped
along if needed on 80M by additional wire length past A.

The A-stubs reduce the electrical lengths each side to overall
40M-dipole-size.

Ditto B-stubs on 20M.

Ditto C-stubs on 15M.

Changing the D-lengths to single wires, or shorting both inner ends,
completes the 10M-dipole section.

Editorial comments:

The feed shown is "incorrect". Stubs at D are not needed, unless one wishes
to add higher-frequency capability. Single wires are sufficient for the 10M
portions of the dipole.

This Lattin antenna is not easily constructed or tuned, and it reminds me of
something from the category of solutions running around looking for
problems.

The current amateur application that I can think of which is done "properly"
is the KLM h-f tribander. The stubs are of open-construction, and the first
stubs, at the outside end the 10M portions of the antenna elements, can be
seen easily, even in pictures.

Dear Dave,

I could certainly be wrong, but my calculations indicate that the "C"
stubs are designed to produce a trap for 10 meters - not 15 meters.

The feed shown is at worst ambiguous. Actually, according to my
measurements and according to common sense, the "D" stubs perform no
useful function. You can feed from either wire or you can twist those
two wires together and feed jointly - same result.

I think the purpose in carrying the same material all the way through
the design was the real point, but section D is just wire for the 10
meter dipole. There may have been some subtle reason for having a stub
at position D that resonates at 25 MHz, but I don't see it.


Bob, W9DMK, Dahlgren, VA
http://www.qsl.net/w9dmk

Hi, Bob:

I'm good, really too good ;o) at mis-writing, dag nab it, and I forgot that
15M wasn't a ham band when Lattin was working on the patent for this kluge.
IIRC, the design was for 4, not 5, bands: 10-20-40-80M, with single wires at
D. Accepting that, and re-writing just the C-stub function ...

SNIP
If the dimensions are added up, the overall physical length approaches
that
of an 80M dipole. "Loading-effect" of the "fat-wire" dipole could be
helped
along if needed on 80M by additional wire length past A.

The A-stubs reduce the electrical lengths each side to overall
40M-dipole-size.

Ditto B-stubs on 20M.

******rewrite*** Ditto C-stubs on 10M. ******rewrite******

Changing the D-lengths to single wires, or shorting both inner ends,
completes the 10M-dipole section.
SNIP

... should do it.

Imagine adding 60-30-17-15-12M to this kluge.

Lattin's patent was 2535298.

73, Dave, N3HE

I forgot that
15M wasn't a ham band when Lattin was working on the patent for
this kluge.
IIRC, the design was for 4, not 5, bands

Lattin (W4JRW) mentions in his December 1960 QST article that any of
his "decoupling stub" antennas that include 40 meters will also work
on 15 meters.

A quote from the article:

"Any of the antennas which will operate on 40M can also be used on 15M
as the 40M stubs will be approx. 3/4 wavelength long and will provide
decoupling."

Lee Carkenord KA0FPJ