EZNEC File for J Pole
Fractenna
Because I have no interest in encouraging more abuse, I will not provide said
file to those who have made personal attacks.
That file, when run, reveals the 3 voltage maxs, the two current maxs, and the
ability to position the feed in the bottom, so that a BALANCED, and good match
to 50 ohms is attained.
The cancelation of phases I described on the 'u' counterpoise is readily
apparent.
73
Chip N1IR
Fractennis
Fractenna
>
>
Sorry. I won't play ball with you.
NC
Fractennis
I would like to review the EZNEC file that you offered.
-- Julie
Fractenna
>
>I would like to review the EZNEC file that you offered.
>
>
>-- Julie
>
Hello 'Julie'
I said that I would not oblige those who abuse. If you wish to send me email
and tell me who you are, I will be happy to send the file. As it stands, I have
no reason to believe that you are not anything other than one of the imps who
frequent the ng--this time with a bogus screename in an attempt to make me look
foolish.
Have a happy day!
\
NC
Fractennis
I still do not understand your response.
I have been following this discussion for some time. However, I have never,
ever posted anything abusive to this newsgroup or any other newsgroup. I have
an interest in amateur radio and antennae and in particular, 3-D fractals.
As a young female, physics student, I cannot send a personal e-mail to you with
my name, call, address, and phone number. You have publicly posted private
e-mail sent to you.
If you choose not to send the file to me, then so be it. But please refrain
from grouping me with those others.
--Julie
Fractenna
Dear "Julie"
E-mail sent in confidence will be held so as long as no illegality is afoot. So
feel free to answer my question via e-mail.
73
Chip N1IR
Richard Clark
Hi Julie,
I am intrigued by your interest in 3-D fractals. I have yet to post
my designs simply because I consider it too far in advance of my more
pedestrian surveys which you may find at
http://www.qsl.net/kb7qhc/
None of these designs even come close to your JPole interest either,
but later this evening I intend to re-post an old post of JPole design
work that I performed on the bench. This may be of more interest to
you. Either way, don't reserve yourself on the basis of poor behavior
in this forum that you have already noted above.
If you wish to accelerate my posting of 3-D fractals, I could supply
my meager work for your consideration if you have EZNEC (or ELNEC for
that matter). You may contact me directly of course, but my
preference is to maintain a public dialog (note I say preference, not
requirement - all forms of communication are acceptable).
And again, I encourage your participation, especially in the topics of
fractals as I find it exceedingly difficult to pursue a thread more
than several exchanges without harassment diverting attention (I care
nothing about that behavior considering the source(s), it is the
consequence of the behavior that is frustrating).
For other posters who have clamored for "real" fractal designs (i.e.
something that could be reasonably described and be somewhat easily
erected); I will shortly have a modest design to offer for
construction - hopefully with enough detail to match their
expectations. This is not to say it is a world class example, it may
well turn out to be no better than the system it replaces, but I have
already done much of the work, and the process of presentation takes
more time. Early results at least offer the prospect of interesting
comparisons of variations of implementation styles of one design.
That is, the same basic design in the form of sloper, dipole, top
loaded vertical and so on. I have attempted to reduce the complexity
to a requirement of having only three (3) non-conductive guys to hold
the geometry in place. It has been an exercise of ingenuity (perhaps
not my strong suit), and I hope it provides a basis for congenial
discussion and further elaboration by others.
73's
Richard Clark, KB7QHC
Maxim1066
I've changed my screen-name to avoid any harassment. Since I play tennis and
like fractals, I thought fractennis would be fun. Wrong! I'm totally
filtering every message generated by that other person. It saves a tremendous
amount of time for me.
I will look at your web page when I get caught up.
Thanks again,
Julie
Richard Clark
Hi Julie,
Here is the follow-up re posting relating to my bench work:
***********************************************
On 29 Mar 1997 20:52:04 -0600, na...@omnifest.uwm.edu (Nate T.
Lauterbach) wrote:
>Hello. I'm in need of a set of plans to construct a 2 meter J-Pole for
>use with my HT when I'm at home. Could anybody help me out?
>
>TIA.
>Nate, N0PCL
>
Hi Nate,
I was going through some old tests and ran across something that may
help. Some years ago I was testing various structures for resonance
and one of them was the J-Pole. This design was built around an
SO-238 bulkhead connector. This, like my 0.25 wl ground plane, was
built up from 0.085" diameter bronze tubing. In each case, the center
connection is brought out 13 inches. For the ground plane, four
radials were connected: one at each mounting hole (a fairly comonplace
design for UHF/VHF) and sloped 135 deg. away from the vertical. For
the J-Pole variations I replaced the four radials with one vertical
element that paralleled the main element with a constant separation of
0.5 inch. The appearance this gives is of a co-ax to connector to
uneven twin lead. I made no attempt to provide for ground (J-Poles
also neglect this treatment). The antenna was mounted 1 meter from
any metal structure.
This antenna was tested over a range of frequencies from 400 MHz to
900 MHz. All SWR's less than 12 were noted.
The initial J-Pole design had a 13.0" Radiator with 12.0" matching
section. This I will admit is rather radical and stretches the
definition mightily, but I was willing to test the range of values for
the matching section to see how operation varied (much less how J-Pole
theory stood). So with this extremely shortened J-Pole I noted that
its best match was at 714 MHz but only with a 3.9:1 fit. Then I
brought out the dikes and snipped 1.0" from the matching section. My
J-Pole now resonated at 757 MHz and presented 1.22:1 SWR. I again
took hold of my dikes and snipped many more times, noting the change
in SWR as I clipped away. I will spare all but the details:
Radiator Match Fo SWR
Length Length MHz 50 Ohm
13.0 12.0 714 3.9
13.0 11.0 757 1.22 (740-770 < 2:1)
13.0 10.5 763 2.20 (740-780 < 3:1)
13.0 10.0 763 3.07
13.0 9.0 702 3.9
13.0 8.0 702 4.0
13.0 7.0 702 3.6
13.0 6.0 485 2.8
13.0 5.75 548 2.3
13.0 5.5 556 1.8
13.0 5.25 576 1.8 (545-630 < 3:1)
13.0 5.0 624.5 1.48 (575-640 < 2:1)
13.0 4.75 638 1.08 (640-660 < 2:1)
Upon review of this data, I regret not having gone another inch or
two. I present this data with some reservations. Although I
calibrated the coax feed point as the reference plane, I am not sure
how much the coax outer-shield contributes to the observed resonances.
This I also observe to be an oversight in regard to J-Pole discussion.
Thus the data is representative within these loose constraints.
Nate, these numbers should be scalable to the frequency you want to
run with. My guess is that a radiator of 57" with a match section of
21" will come close. As to scaling the tube diameter, this I am at
odds with. If the matching section represents a 0.25 wl transmission
line, then the present geometry will suffice; but I suspect there are
other mechanisms that will complicate this and some cutting may be
required (as such make the matching element a couple of inches longer
and snip by quarter inch increments).
If scaling the tubing is necessary (for any reason) and the match
section is to operate as a quarterwave resonant transmission line per
this device; then maintain a 0.5/0.085 ratio in separation/diameter
measurements. This defines a 300 Ohm line which will match a 50 Ohm
source to a 1800 Ohm load (the radiator, presumably a high Z, halfwave
end fed monopole). A higher Z match section will work, and with
probably no more effort than the present design.
Richard Clark
>Richard Clark wrote:
>>
>> On 07 Sep 2000 01:17:58 GMT, maxi...@aol.com (Maxim1066) wrote:
>>
>> >Thanks for your nice reply, Richard.
>> >
>> >I've changed my screen-name to avoid any harassment. Since I play tennis and
>> >like fractals, I thought fractennis would be fun. Wrong! I'm totally
>> >filtering every message generated by that other person. It saves a tremendous
>> >amount of time for me.
>> >
>> >I will look at your web page when I get caught up.
>> >
>> >Thanks again,
>> >
>> >Julie
>>
>> Hi Julie,
>>
>> Here is the follow-up re posting relating to my bench work:
>>
>
>Hi Richard,
>
>You might want to take note of the posting host used by
>maxi...@aol.com. Coincidentally, it's the same host, ...audrey05...
>that frac...@aol.com often posts from during 'business' hours. From
>what appears to be his home, he usually posts through ...audrey04...
>Rick, k1bqt also posts from audrey04 (or is it 05?). Interestingly, all
>of the suspected aliases for Chip also post from one of the same two
>hosts......
>
>bart
>wb6hqk
Hi Bart,
I have to act otherwise - and acting so is my preference. The specific servers you are
faulting would condemn a portion of the population, just to flick a gnat.
Now, as to audrey04, is that a plant somehow related to AudreyJunior? (this is a subtle
film reference to "The Little Shop of Horrors" - Steve Martin comes to mind:-)
73's OM
Richard Clark, KB7QHC
Fractenna
>>
>> On 07 Sep 2000 01:17:58 GMT, maxi...@aol.com (Maxim1066) wrote:
>>
>> >Thanks for your nice reply, Richard.
>> >
>> >I've changed my screen-name to avoid any harassment. Since I play tennis
>and
>> >like fractals, I thought fractennis would be fun. Wrong! I'm totally
>> >filtering every message generated by that other person. It saves a
>tremendous
>> >amount of time for me.
>> >
>> >I will look at your web page when I get caught up.
>> >
>> >Thanks again,
>> >
>> >Julie
>>
>> Hi Julie,
>>
>> Here is the follow-up re posting relating to my bench work:
>>
>
>Hi Richard,
>
>You might want to take note of the posting host used by
>maxi...@aol.com. Coincidentally, it's the same host, ...audrey05...
>that frac...@aol.com often posts from during 'business' hours. From
>what appears to be his home, he usually posts through ...audrey04...
>Rick, k1bqt also posts from audrey04 (or is it 05?). Interestingly, all
>of the suspected aliases for Chip also post from one of the same two
>hosts......
>
>bart
>wb6hqk
>
I strongly am offended by these insinuations Mr. Rowland. I am not ALIASING
anyone. And I am NOT k1bqt,.'Julie' or anyone else.
Get a grip.
NC
Tom W8JI
>I strongly am offended by these insinuations Mr. Rowland. I am not ALIASING
>anyone. And I am NOT k1bqt,.'Julie' or anyone else.
>
>Get a grip.
>NC
Hi Bart,
May I respectfully suggest you follow "NC's" suggestion, and get a
grip?
If you do so, and if your grip is powerful enough and reaches far
enough to the east, you can do all of us a favor!
73 Tom
K1BQT
of the suspected aliases for Chip also post from one of the same two
hosts......<
Ever wonder why K1BQT hasn't appeared at Dayton or Boxboro lately? Fact is,
"the poor old geezer slipped and fell into the freezer", as they say--and I've
been aliasing his entire life in one short 10-minute-a-day workout for over
three years! The controversial posts...the fights...the smart-ass
remarks...those ham products ....the magazine articles...ALL MINE, in my spare
time, and with with one hand tied behind my back! And you think I'm not a
clever fellow, Mr. Rowlett?
Tom W8JI
Moh. Rikki,
I'll encrypt this message, using the Apple code.
I understand your great despair are being mentioned in the same post
as the world knowns and disrespected Barron of Bent, the Czar of Zig,
Dr. Kinko-Cohenko.
I don't think Bart meant you were Chip and NC was you and Nate is us
and we are all together. See how they run like pigs from a gun....oh
you know what I mean.
When I read his post, I understood use you as a general guideline
illustrating the basic geographical location of the spurious emissions
that radiate from Cohendoggie, Phil, Fritz99, and the gaggle of goofs
at AOL posting from the two access routes used by the multitude of
signature signing under the Fractenna name.
Don't blame poor ole Bart because you live near the newsgroup troll,
and come in through the same ladder. We know you aren't the Walrus.
You are much too tall and slim to be him.
73 Tom
K1BQT
Actually, the implication was supposed to be that I'm really just another
alias--and a person so lazy and shiftless, it takes only 10 minutes a day for
Chip to replicate my total output. Guess it didn't come off right.
Rick
Fractenna
At last count, I supposedly have, oh--what is it--23 aliases? Or is it 39? I
really wish I had that much free time to be that creative (but if I did I'd
take up painting again).
Rick and I have been through some major divisions but I hardly feel either
doubts the existence of the other...am I right Rick?
73
Chip N1IR
K1BQT
doubts the existence of the other...am I right Rick?<
I think I'm all here, yes.
Rick K1BQT
Tom W8JI
...and we all think there is only one of you, Rick, posting under one
name.
Can't say the same for those other AOL guys from your area.
ab2etXXXmy-deja.com
I applaud your courage and generosity in publishing designs that will
include construction or duplication details, it has been my opinion
for many a year that having 20 brains working on a problem will clear
the fog on the subject at hand rather fast.
It is my opinion that the biggest problem that has faced Fractal
Antennas as they pertain to amateur radio usage is the lack of clear
and concise information on construction and "practical" Implementation
Guidelines as they pertain to usage and thus true performance
verification.
It is hard to play "Karnack the Magnificent" and keep an open mind on
the subject when the envelope has nothing in it.
This information vacuum has lead to inconsistent claims that are not
easily verifiable by many in the amateur community that expresse an
interest in exploring new and potentially beneficial forms and thus the
discourse and bluster by some.
Again looking forward to the information, Yes it is fall again and high
time again to build some before the first snow...
73's Steve
oo
(__)
AB2ET
"I bet Two Extra "Terrestrials"
Aperture Engine is that a
singularity detector?
In article <39b99743...@news.seanet.com>,
Sent via Deja.com http://www.deja.com/
Before you buy.
kk5...@gmail.com
could you send me a copy of you jpole eznec file and thanks.
Darryl, KK5IB
lovell....@gmail.com
Do you have a file for the ham radio Cobra 160 meter version antenna?
J.B. Wood
--
J. B. Wood e-mail: arl_1...@hotmail.com