-square array (240 radials
125 feet long).
73
Frank
W3LPL
- Original Message -
From: "Edward R Cole" <kl...@acsalaska.net>
To: "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: Thursday, March 2, 2017 8:33:27 AM
Subject: Re: [Elecraft] 80 Me
capacitive loading to the resulting vertical.
73, Ed - KL7UW
Date: Wed, 1 Mar 2017 10:41:40 -0800
From: "Ron D'Eau Claire" <r...@cobi.biz>
To: "'Charlie T, K3ICH'" <pin...@erols.com>,
<elecraft@mailman.qth.net>
Subject: Re: [Elecraft] 80 Meter Vertic
I did that on my 630m inverted-L. Obviously 43-feet vertical is very
short on 495-KHz (less than 10% of a quarter wave), so the antenna is
heavily base loaded by a coil plus the 122-foot top section adds a
little capacity. I ran three wires in parallel spaced a foot apart
in the vertical
The fan antenna over my house is multiple resonant dipoles on different bands
with a common feedpoint. Those work fine.
You can also have a driven dipole with a parallel coupled resonator of a
slightly different length. This will give an antenna with a second
near-resonant point and lower SWR
I know them as fan antennas. The old UHF "bow tie" TV antennas are a good
example.
The discussion about radiation resistance vs. feed-point resistance is
specious. When feeding more than one resistance in series, such as a
monopole impedance and a ground impedance, Ohm's law prevails. The higher
Coupled resonator? I built a C-R antenna for 30, 17, and 12 when we
first got the WARC bands using 300 ohm open-wire line. Only the 30 m
wire was fed. It seemed to work well, on the rare occasions I could
find someone on the bands. The same technique can be used to expand the
BW of an 80
We're exceeding the OT limit on this topic. While very interesting, lets wrap it
up by end of day today.
73,
Eric
Moderator
/elecraft.com/
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Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
I’m not sure what the original post is actually suggesting, but there are three
antennas techniques like that, and all have their uses.
A cage element connects everything together to make a fat, low-Q element. Those
often have enough bandwidth to work over the entire 80m band. W1AW uses a cage
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80 Meter Verticals
Now that I provided the succinct answer, allow me to provide an in-depth answer.
But rather than me doing it, I will take the easy way out and simply provide a
link to the fine explanation done by Tom, W8JI:
https://www.w8ji.com
Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Charlie
T, K3ICH
Sent: Wednesday, March 1, 2017 5:25 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80 Meter Verticals
Is there any truth in the theory of making the vertical radiator out of
multiple wires such as ladder line and
On Wed,3/1/2017 5:25 AM, Charlie T, K3ICH wrote:
Is there any truth in the theory of making the vertical radiator out of
multiple wires such as ladder line and even adding a third wire woven through
the ladder sections and fed on one wire?
Nope. And that's not "theory," that's someone's dumb
, March 1, 2017 10:18 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80 Meter Verticals
Now that I provided the succinct answer, allow me to provide an in-depth answer.
But rather than me doing it, I will take the easy way out and simply provide a
link to the fine explanation done by Tom
Now that I provided the succinct answer, allow me to provide an in-depth answer.
But rather than me doing it, I will take the easy way out and simply provide a
link to the fine explanation done by Tom, W8JI:
https://www.w8ji.com/radiation_resistance.htm
Wes N7WS
On 3/1/2017 7:27 AM, Wes
-Original Message-
From: Wes Stewart
Sent: Wednesday, March 01, 2017 8:27 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80 Meter Verticals
No truth at all.
Correct -- radiation resistance remains the same or even slightly lower --
lower Q.
73, RoyK6XK
No truth at all.
On 3/1/2017 6:25 AM, Charlie T, K3ICH wrote:
Is there any truth in the theory of making the vertical radiator out of multiple wires
such as ladder line and even adding a third wire woven through the ladder sections and
fed on one wire? The physical result is three parallel
bject: Re: [Elecraft] 80 Meter Verticals
One characteristic of a "T", assuming the top wires run in opposite directions
and are of equal length, is that radiation from the top wires is highly
suppressed because they are fed "in phase" by the vertical section. That
many "spokes". The QST archives have his articles.
73 Ron AC7AC
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Vic
Rosenthal
Sent: Tuesday, February 28, 2017 4:01 AM
To: elecraft@mailman.qth.net; Dauer, Edward
Subject: Re: [Elecraft] 80 M
Because?
Have a great day!
Bill J
K9YEQ
From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Wes Stewart
<wes_n...@triconet.org>
Sent: Tuesday, February 28, 2017 11:37:13 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80 Meter Ve
Ted,
You need to read W7XC's (SK) article in QST Mar 1990, pp 26-30
On 2/27/2017 4:13 PM, Dauer, Edward wrote:
A question that’s admittedly a bit OT – though if I need a pretext, the rig to
be used is a K3 . . .
I have been reading through the usual texts about vertical antennas for 80
Theoretically the more top loading you have, the higher the radiation
resistance and the better the efficiency. So I like the T better than the L.
I used to have an open wire fed doublet which could be switched to T
configuration. It was very helpful to switch between horizontal and vertical
On Mon,2/27/2017 3:43 PM, Don Wilhelm wrote:
The inverted L will have some horizontally polarized radiation.
Yes, but not much, because radiation is the result of current, and
current is maximum at the bottom and minimum at the far end of the wire.
And Fred is right on about verticals
Verticals are generally an S-unit or maybe 2 noisier on receive than
horizontal antennas unless you are in a very quiet location. A base-fed
1/4 wave [or less] vertical is analogous to a telegraph line with one
wire, using ground as the return. If you can't put in a good ground
system,
Ted,
I would recommend very much the site of DJ0IP for tonns of brilliant ideas
on really working antennas. And also a great article of N6LF in QST March,
2010 on radials. You don't need to have 64 or 164 or a chicken mash all
over the field to get the very eficient antenna working DX. 16 is
Ted,
The inverted L will have some horizontally polarized radiation. The
other top loaded verticals should have only vertically polarized
radiation - assuming that the top loading is symmetrical, whether that
be a capacity hat or a T wire.
In general, the vertically polarized radiation
A question that’s admittedly a bit OT – though if I need a pretext, the rig to
be used is a K3 . . .
I have been reading through the usual texts about vertical antennas for 80
meters, to replace the half wave dipole I now have and the Vee I had but didn’t
like. But I have not yet found the
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