501 ladder line #18 solid CCS copper thickness is 0.0717 mm
http://copperweld.com/sites/copperweld.com/files/w30ccs-ed5230.pdf
RF skin saturation is well below 1 MHz using the calculator:
http://owenduffy.net/calc/SkinDepth.htm
551 is #18, 19/30 stranded, #30 CCS copper thickness is 0.0178 mm
This may not always be possible.
Copper-clad steel exists because it's stronger than copper. Wind, ice,
or simply a long span can exceed the strength of copper, and then you
don't have an antenna at all.
"Over-engineering" by making the wire bigger also makes it heaver and
gives it a
Thanks... and if I missed a response from the OP, thank as well.
Well then... that seems to vindicate my desire to avoid CCS wire and
"overengineer" with the use of larger wire diameters.
And it clues me in to pay attention to every single detail when
designing a transmission line system.
Wireman 553 uses a 19 strand Copper Clad Steal (CCS) conductor which
results with very thin copper cladding. 553 is skin saturated at about
15 MHz. The loss at 1.8 MHz is approximately 0.21 dB per 100 feet.
http://www.kn5l.net/wm553/
Using EZNEC and SimSmith for the antenna below results with
I calculated the antenna using AutoEZ invoking EZNEC v6.0.9. Transmission line
calculations using TLDetails (previously referenced) and/or if you have Excel,
LineLoss.xls. All except for EZNEC available from AC6LA.com. Dan has a wealth
of information on his site, all of it fabulous
Something doesn't seem right with that Care to post the math? Not
saying you're wrong, and I'd check it myself, but I'm otherwise occupied
this evening.
__
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
On 1/31/2017 4:12 PM, Wes Stewart wrote:
> A 130' dipole, 60'
: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes
Stewart
Sent: Tuesday, January 31, 2017 5:07 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] The "Kinda Random Antenna"
Sadly, this is often untrue.
Get Dan's (AC6LA) program at: http://ac6la.com/tldetail
I disagree. A center fed quarter wave will have a complex impedance of a few
ohms of resistance and a very large capacitive reactance. SWR can be 100:1. I
know, I am doing it. Why it works with good open wire line is that the line can
transform the impedance to something that is easy to match
ter losses.
73, Ron AC7AC
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Wes
Stewart
Sent: Tuesday, January 31, 2017 5:07 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] The "Kinda Random Antenna"
Sadly, this is often untrue.
Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes
Stewart
Sent: Tuesday, January 31, 2017 5:07 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] The "Kinda Random Antenna"
Sadly, this is often untrue.
Get Dan's (AC6LA) program at: http:/
Sadly, this is often untrue.
Get Dan's (AC6LA) program at: http://ac6la.com/tldetails1.html and run some
examples.
for more on ladder line see: http://k6mhe.com/n7ws/Ladder_Line.pdf
On 1/30/2017 9:00 PM, Barry wrote:
...I feed it with ladder line which has low loss even at absurdly high
s O.T.s
call a "doublet" or "center fed wire".
73, Ron AC7AC
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Emory Schley
Sent: Monday, January 30, 2017 5:38 PM
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] The &quo
K3NDM
-- Original Message --
From: "Bill Johnson" <k9...@live.com>
To: "'Barry'" <k3...@comcast.net>; "'Emory Schley'"
<silverlo...@gmx.com>
Cc: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
Sent: 1/30/2017 9:42:
ed wire".
73, Ron AC7AC
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Emory
Schley
Sent: Monday, January 30, 2017 5:38 PM
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] The "Kinda Random Antenna"
I've found over the years that a Mc
Lots of dipole calculators on the net. The total length of a center fed
dipole is 1/2 wave, and that's the magic number.
If you are operating at 14.300 and you're trying to end-feed a wire that
is 32.7 feet long (same length as a dipole, but *not* fed at the
middle), the impedance will be
OH YES, the headaches from looking at the formulas at this stage of the
game. A friend added two coils to the end of his 75 meter dipole for 160.
He loads it but has no clue as to impedance and loading. He tunes it for
160 but it is not effective. The idea is to get loading into an efficient
nd don't think about
that extra db.
73,
Barry
K3NDM
-- Original Message --
From: "Fred Jensen" <k6...@foothill.net>
To: elecraft@mailman.qth.net
Sent: 1/29/2017 6:10:29 PM
Subject: Re: [Elecraft] The "Kinda Random Antenna"
N6BT famously set up a "phased
arry
K3NDM
-- Original Message --
From: "Fred Jensen" <k6...@foothill.net>
To: elecraft@mailman.qth.net
Sent: 1/29/2017 6:10:29 PM
Subject: Re: [Elecraft] The "Kinda Random Antenna"
>N6BT famously set up a "phased array" of 3 light bulbs in a
Just recently, I was testing an 80W 2M amplifier into a dummy
load. I noticed that anytime I send a signal into it, it
triggered the local repeater. (I changed frequencies.) However,
I can work the local repeater from my living room with a HT set
at 100 mW, so it doesn't take much.
Now if I
an.qth.net
Subject: Re: [Elecraft] The "Kinda Random Antenna"
N6BT famously set up a "phased array" of 3 light bulbs in a V-beam
configuration and achieved WAC. He called it "The Illuminator." Kurt N.
Sterba [a regular in the old WorldRadio] is correct, the p
-- Original Message --
From: "Fred Jensen" <k6...@foothill.net>
To: elecraft@mailman.qth.net
Sent: 1/29/2017 6:10:29 PM
Subject: Re: [Elecraft] The "Kinda Random Antenna"
N6BT famously set up a "phased array" of 3 light bulbs in a V-beam
config
N6BT famously set up a "phased array" of 3 light bulbs in a V-beam
configuration and achieved WAC. He called it "The Illuminator." Kurt N.
Sterba [a regular in the old WorldRadio] is correct, the power will go
somewhere. My home antenna is a 136' wire strung along the wood fence
on electric
Hi,
have a look at this one:
http://pa-11019.blogspot.de/2017/01/efhw-antenna-for-40-10m-qrp.html
It works as indicated in the measurements. I use it for the other bands
with the ATU of the Kx3 and Kx2.
73 de Hajo dl1sdz
---
Cela est bien dit, mais il faut cultiver notre jardin.
There's an unavoidable tradeoff using an end fed wire with an ATU of
limited range. Since the ATU can't match the high impedance of a half
wave multiple, the lower impedance of the wire will lead to larger
ground/counterpoise currents. Even with a decent ground and/or
counterpoise, some
For general low-band operation, I use a doublet that is 75 feet long on
each leg, and fed via ladder line to a BL-2 balun near the shack. The
fifteen feet of coax to the balun is low-loss LMR400. The low-loss coax
helps with the high SWR problem, in that the losses are minimized (for
what I
ot;Tom McCulloch" <th...@att.net>
Cc: "Elecraft Reflector" <elecraft@mailman.qth.net>;
"k...@yahoogroups.com" <k...@yahoogroups.com>
Sent: 1/29/2017 12:40:58 PM
Subject: [Elecraft] The "Kinda Random Antenna" (was: Random wire lengths
for antennas)
I'd
I'd call an ad-hoc antenna that works on multiple bands with an ATU a
"Kinda-Random Antenna" (KRA). (Apologies to linguistic purists.)
A simplified definition might be:
A. long enough to work within the maximum limits of the ATU's L-network on
the lowest band used
B. presents a
I'd call an ad-hoc antenna that works on multiple bands with an ATU a
"Kinda-Random Antenna" (KRA). (Apologies to linguistic purists.)
A simplified definition might be:
A. long enough to work within the maximum limits of the ATU's L-network on
the lowest band used
B. presents a
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