[KX3] Re: Can't believe my Chameleon Antenna!

[Ken G Kopp]

Another two cents worth ...

A few years ago there was a dipole advertised in QST and other
places that claimed to be "broadband with a very low SWR on all
bands".  Turns out an XRAY of the junction box / center insulator
revealed a resistor (50 ohms?) in parallel with the coax connector
and the dipole. (;-)

73!

Ken - K0PP

----------------------------------------------------------------------------------------------------

Excuse me for being ignorant...
Cut and paste from the Chameleon web page
"antenna base has an integral broadband impedance matching network allowing
broadband antenna tuning.
An external antenna tuner is required to provide a low VSWR."

I see very little difference between this antenna, a PAR EFHW
or any other EFHW that uses an impedance matching unit.

Just my 2 cents worth

Flame suit is ON.!!

--
Dave G KK7SS
Richland, WA
'59 Morris Minor 1000 - working on it :|
'65 Sprite - running :)
'76 Midget - co-owned with #4 Son :)
'06 Honda Civic Hybrid
  ------------------------------
*From:* grosseindienne <[hidden email]>
*To:* [hidden email]
*Sent:* Monday, November 19, 2012 12:24 PM
*Subject:* [KX3] Re: Can't believe my Chameleon Antenna!


Guido,

You're right! This is more than incorrect. Here is more YouTube of the
antenna in action:

http://www.youtube.com/watch?v=0qzAmI0XWgY
http://www.youtube.com/watch?v=kT-yYF97AGY
http://www.youtube.com/watch?v=ACCZr-WFRmU

The right website is http://chameleonantenna.com/

For real information about the product people can go, read and ask
questions to their hundreds of customers on their forum:
http://chameleonantenna.com/CHAFORUM/index.php

-C



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[N0AZZ]

Some people do well using a dummy load.

Fred/N0AZZ

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Ken G Kopp
Sent: Monday, November 19, 2012 4:12 PM
To: [hidden email]
Subject: [Elecraft] [KX3] Re: Can't believe my Chameleon Antenna!

Another two cents worth ...

A few years ago there was a dipole advertised in QST and other places that
claimed to be "broadband with a very low SWR on all bands".  Turns out an
XRAY of the junction box / center insulator revealed a resistor (50 ohms?)
in parallel with the coax connector and the dipole. (;-)

73!

Ken - K0PP

----------------------------------------------------------------------------
------------------------

Excuse me for being ignorant...
Cut and paste from the Chameleon web page "antenna base has an integral
broadband impedance matching network allowing broadband antenna tuning.
An external antenna tuner is required to provide a low VSWR."

I see very little difference between this antenna, a PAR EFHW or any other
EFHW that uses an impedance matching unit.

Just my 2 cents worth

Flame suit is ON.!!

--
Dave G KK7SS
Richland, WA
'59 Morris Minor 1000 - working on it :|
'65 Sprite - running :)
'76 Midget - co-owned with #4 Son :)
'06 Honda Civic Hybrid
  ------------------------------
*From:* grosseindienne <[hidden email]>
*To:* [hidden email]
*Sent:* Monday, November 19, 2012 12:24 PM
*Subject:* [KX3] Re: Can't believe my Chameleon Antenna!


Guido,

You're right! This is more than incorrect. Here is more YouTube of the
antenna in action:

http://www.youtube.com/watch?v=0qzAmI0XWgY
http://www.youtube.com/watch?v=kT-yYF97AGY
http://www.youtube.com/watch?v=ACCZr-WFRmU

The right website is http://chameleonantenna.com/

For real information about the product people can go, read and ask questions
to their hundreds of customers on their forum:
http://chameleonantenna.com/CHAFORUM/index.php

-C



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[k6dgw]

B&W has marketed a broadband folded dipole antenna that has a resistor
terminating the top wire for decades.  They are indeed "broadband" and
they must have sold a gazillion to the military because you regularly
see them over National Guard and Reserve armories. They're great for the
military who generally are not chasing DX or weak signals.  Hams ... not
so much.  To their credit, the resistor has never been a secret.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org

On 11/19/2012 2:11 PM, Ken G Kopp wrote:
> Another two cents worth ...
>
> A few years ago there was a dipole advertised in QST and other
> places that claimed to be "broadband with a very low SWR on all
> bands".  Turns out an XRAY of the junction box / center insulator
> revealed a resistor (50 ohms?) in parallel with the coax connector
> and the dipole. (;-)


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[Benny Aumala-2]

Reminds me of Diamond BB-7V (vertical) and BB-6W (wire) antennas.
Takes 200W and analyzer gives nice SWR across HF.

We added the length of wire gradually from 6 to 30 meters,
and always better it worked.

What is inside? I had to open it. Plenty of big resistors !
About 5 % of power is possible to get to the wire, 95% goes to
the resistors, which can take the 200W.

If you are QRP, you have made compromise with the power.
Do not make it again with radiation. To compare with
100W and dipole, you have left much less than 1%.

Benny    OH9NB

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[Edward R Cole]

A cheap version of this antenna is a 100w incandescent light bulb
with a few feed of "lamp cord" with a PL-259 attached.  If you can
load it, it makes a cheap dummy load that leaks RF.  What I used as a
Novice in the 1960's.  I actually made some 40m contacts with the
"light bulb" antenna over several hundred miles with 75w from my DX-35.

73, Ed - KL7UW

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[k6dgw]

On 11/21/2012 11:01 AM, Edward R Cole wrote:
> A cheap version of this antenna is a 100w incandescent light bulb with a
> few feed of "lamp cord" with a PL-259 attached.  If you can load it, it
> makes a cheap dummy load that leaks RF.  What I used as a Novice in the
> 1960's.  I actually made some 40m contacts with the "light bulb" antenna
> over several hundred miles with 75w from my DX-35.

Tom, N6BT, of Force12 fame, often concludes his presentations with a
tour of his "Illuminator" antenna ... a light bulb in a porcelain socket
mounted on a fence post and fed with a short piece of coax with a
current choke at the lamp.  He claims to have worked all continents with
it.  He then expanded it to a "phased array" with three bulbs arranged
in a Vee, "for additional gain." :-)

While on the subject of "too good to be true" antennas, for many years,
the US military used very large, physically impressive, HF log-periodic
beams.  The first one I saw was in 1963 on the roof of the WW2 hangar at
Galena AFS in the northern interior of AK, for the MARS station.  They
had around 15 or so elements on a lattice boom, and I remember thinking,
"Wow!  That sucker should really radiate."  A lot have disappeared
[satellite comm?], but you'll occasionally see one at a Natl Guard
armory.  Basically, 3-30 MHz with low SWR.

I was truly disappointed when I discovered it offered maybe 3-4 dB gain
on any given frequency.  The tribander on the same roof for the ham
station [KL7FBK] out-performed it by a significant margin.

73,

Fred K6DGW


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[Nate Bargmann]

* On 2012 21 Nov 14:51 -0600, Fred Jensen wrote:
 
> I was truly disappointed when I discovered it offered maybe 3-4 dB
> gain on any given frequency.  The tribander on the same roof for the
> ham station [KL7FBK] out-performed it by a significant margin.

Life is a trade-off.  The tri-bander offered better gain on three bands.
The log likely offered near seamless frequency agility from 3 to 30 MHz
without the need for tuners and such.

I guess we'll keep searching for that perfect antenna.  :-)

73, de Nate, N0NB >>

--

"The optimist proclaims that we live in the best of all
possible worlds.  The pessimist fears this is true."

Ham radio, Linux, bikes, and more: http://www.n0nb.us
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[k6dgw]

On 11/21/2012 3:56 PM, Nate Bargmann wrote:

> Life is a trade-off.  The tri-bander offered better gain on three bands.
> The log likely offered near seamless frequency agility from 3 to 30 MHz
> without the need for tuners and such.
>
> I guess we'll keep searching for that perfect antenna.  :-)

Well, with the 2nd Law of Thermodynamics planted firmly in one cheek ...
I want 3-30 MHz with at least 10 dB gain.  Don't we all? :-)  Big
doesn't always do it in all departments.  In the coastal marine service
in 1956/7, our transmit [and receive] antennas were huge by ham
standards ... unless you were W6AM.  Unfortunately, one antenna per
transmit frequency, and most of the HF receive frequencies too.

I was just stunned by that LP.  I was 23, fresh out of college, a ham
for 10 years, but 5 of those were in college, basic training, and
officers' school, and pretty much QRT.  Biggest beam I'd ever seen.  I
was equally stunned when I found out exactly how it worked.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org


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