OK, thanks all for that info, its obviously something I havent read altho I
have those HB's.
Carl
KM1H
- Original Message -
From: Dave Heil k...@frontiernet.net
To: topband@contesting.com
Sent: Friday, August 03, 2012 12:44 AM
Subject: Re: Topband: THE ITINERANT 160 METER ANTENNA
The claim was made in the last several editions of the Radio Handbook in
describing a TV twinlead folded Marconi for 160m.
I believe the idea was not in QST, because at that time QST had good
technical editing. There were very few gross technical gaffs in QST back
then.
As I recall, the idea
Hi Tom,
I am suprised that no one has brought up the T2FD antenna and
of course the BW All-Band antenna.
It was in one of the magazines back in the (50s?).
73
Price W0RI
___
UR RST IS ... ... ..9 QSB QSB - hw? BK
On 8/3/2012 9:49 AM, Tom W8JI wrote:
This illustrates the danger of non-peer reviewed technical articles. I
personally know of at least a half-dozen AM BC stations that invested
money in converting to folded unipoles, and a company in Texas started
producing antennas based on that silly
See, Ham Radio Techniques - 160-Meter Antenna Problems and Solutions, Ham
Radio magazine, Pg. 49, March 1990. A 3-wire version is also proposed to
increase the radiation resistance by 9x. In the single and multi-wire folded
versions the ground loss resistance remained constant. Note that Bill
Price, The Military and U.S. Embassies use T2FD type of antennas all
over their deployment perhaps due to the fact that they do work as long
as you have plenty of horsepower to feed them with. I think the
requirement of frequency agility for their requirement outweighs the
inherent
It's a balance. Even a correct new idea sometimes takes it in the neck so to
speak. Think of all the crap the first guy took from those that said the sun
was circling the earth. After all you could see it for half of the circle.
We have to believe what we know is correct, but have an open
The T2FD was described in QST for June 1949 and CQ for November 1951 and
February 1953, all by USN Capt G.L. Countryman, W3HH.
Included are results reported by the USN, who did the design, in comparison
to existing antennas as well as detailed construction details. Wire spacing
and tilt angle
Note that Bill was obtaining his results from the K6STI antenna
modeling software he was using. I am not familiar with that program's
capabilities or accuracy and it is clear from the article he believed
the results he obtained from it.
Bill simply did not understand the difference between
T2FD I though came out around in the Navy since 1940.
It is -5 db down from a dipole. Shortened versions past and present are still
-5db down from what I have been told. They are very good antennas for emergency
stations.
Stay on course, fight a good fight, and keep the faith. Jim
Well said, in every respect, Tom.
73, Jim K9YC
On 8/3/2012 10:07 AM, Tom W8JI wrote:
I don't think any anyone with an experimentation (Edisonian), engineering,
or science background would assume a few errors (or even a few dozen errors)
automatically means we can't trust anything an author
I have been clobbered every time I mention this.
Is there some one other than me that knows the following
I had read in a Hand Book for the 1930's the 3 wire folded dipole and 2 wire
folded dipole had a couple factor of 1. This would make this antenna the
preferred driven element for a long
The problem was that the Ptolemyic concept of a Geo- Centric universe
worked for some basic navigational functions, was universally excepted
and became part of religious doctrine. Anyone who promoted truth of
a HelioCentric Universe whether it was Galileo, Copernicus and even
later Kepler
EDIT: change the second paragraph to:
Included are results reported by the USN, who did the design, in multiple
comparisons
to existing antennas at many locations as well as detailed construction
details. Wire spacing and resistor value combined with feedline impedance is
critical. The tilt
The so called T2FD's sold these days by the usual ham dealer suspects is
nowhere near the original design so its no stretch as to why its not a
great
performer.
Any antenna that increases bandwidth through a resistive termination will
always lose a substantial portion of power as heat on
So gently getting back to the topic of the original post which was:
Getting thoughts on relatively simple and relatively inexpensive
portable 160 m antenna, potentially deployable by one person, that
allows for flexibility and somewhat predictable tuning for use on modest
Dxpeds or rare
Plus ça change, plus c'est la même chose
73,
Ken - K4XL
On Fri, Aug 3, 2012 at 1:59 PM, Herb Schoenbohm he...@vitelcom.net wrote:
The problem was that the Ptolemyic concept of a Geo- Centric universe
worked for some basic navigational functions, was universally excepted
and became part of
Is this a current Topband topic? Did I miss something. I thought folks
were talking about antennas and some new and unusual ideas with respect to
them.
Tod, K0TO
Even today
we have the impact in our economic survival due to the doxology of
AlGore on climate change or man-made climate change.
Herb,
My mistake about the posting censor. I had the topband address incorrect.
Maybe had too many days hiking up on the mountain installing the new FM
radio station transmitter this week.
Sorry Tree
73
Bruce
___
UR RST IS ... ... ..9 QSB QSB - hw?
Just to make certain that we're on the same page, I'm writing of the
Radio Handbook, the one Bill Orr edited. It was a Radio Magazine
handbook, perhaps later CQ Magazine and finally published by Sams. That
was the one filled with linear amplifier articles for both HF and VHF.
I think more of
If youre stuck with on ground radials figure you wont have room for full
size. In that case see if 50'x 2' rolls of galvanized chicken wire is
available locally. Put out 4 rolls as spokes and wire together at the far
ends and at the antenna base. Also solder the points where they start to
Mais avec les femmes vous ne jamais leur dire qu'ils sont en train de
changer mais oui
- Original Message -
From: Kenneth Grimm gr...@sbc.edu
To: Herb Schoenbohm he...@vitelcom.net
Cc: topband@contesting.com; Bruce k...@myfairpoint.net
Sent: Friday, August 03, 2012 3:56 PM
Subject: Re:
So gently getting back to the topic of the original post which was:
Getting thoughts on relatively simple and relatively inexpensive
portable 160 m antenna, potentially deployable by one person, that
allows for flexibility and somewhat predictable tuning for use on modest
Dxpeds or rare location
While I was selling, designing and installing Military, Embassy and Coastal
Radio Station upgrades and new installations all over Asia and their
counterparts around the world I was amazed how many BW Folded Dipoles were
specified in tenders, solicitations and requirement documents. I sold
Well said.
- Wes Attaway (N5WA) ---
1138 Waters Edge Circle, Shreveport, LA 71106
318-797-4972 (Office) - 318-393-3289 (Cell)
Computer Consulting and Forensics
-- EnCase Certified Examiner ---
-Original Message-
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