Let's wrap up this discussion in the next 2 of hours. (2130 UTC) There
have been 26 posts in the last 24 hrs on this, which is hitting the
overload threshold ;-)
73, Eric WA6HHQ
Elecraft List Moderator
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Ho
Jim Brown
On Tuesday, March 03, 2009 at 4:34 PM, Jim Brown wrote.
> On Tue, 3 Mar 2009 01:53:19 -, Geoffrey Mackenzie-Kennedy wrote:
>
>>Yes, I take your point. It is the fine tweaking of phase that I find
>>easier
>>to do with a capacitor!!
>
> Please tell me how you would do that with thi
On Tue, 3 Mar 2009 01:53:19 -, Geoffrey Mackenzie-Kennedy wrote:
>Yes, I take your point. It is the fine tweaking of phase that I find easier
>to do with a capacitor!!
Please tell me how you would do that with this antenna! :) The "tweaking"
involved requires nothing more than looking at
On Tue, 3 Mar 2009 07:28:12 -0500, Matt Palmer wrote:
>I've been thinking of building one of these to play with, do you have
>any ideas on how to stress relieve the point where you solder the wire
>to the coax? This seems to be the weak link in the chain.
I use the inexpensive dipole insulator so
On Mon, 02 Mar 2009 22:48:03 -0500, Don Wilhelm wrote:
>I fail to see the advantage of constructing an end fed dipole with coax
>for half of the antenna
The advantage is if it solves a particular rigging problem that you
encounter.
73,
Jim K9YC
_
I think a dipole fed with balanced line is the best choice as a primary
antenna, it works well on multiple bands with a good balanced tuner. Or even
a dipole fed with coax, but then you are limited to a single band (unless
you parallel multiple dipoles with a single feedline which works very we
Folks,
I fail to see the advantage of constructing an end fed dipole with coax
for half of the antenna - it requires a choke that has a parallel
resonant frequency equal to the operating frequency, and the overall
length is a half wavelength.
I believe it is much easier to construct a half wav
Jim Brown wrote on Tuesday, March 03, 2009 at 12:59 AM
> A coaxial choke wound on a ferrite core IS a parallel resonant circuit.
> Properly done, the choke should be wound to place the resonant frequency
> where the antenna will be operated! Study the references I cited in the
> earlier post.
Y
On Tue, 3 Mar 2009 00:15:04 -, Geoffrey Mackenzie-Kennedy wrote:
>If a resonant trap is placed at the bottom end instead of a choke as an
>insulator,
A coaxial choke wound on a ferrite core IS a parallel resonant circuit.
Properly done, the choke should be wound to place the resonant frequ
>Have you been able to verify that a simple choke really blocks the
>shield current there?
Yes, it works -- IF the choke has a sufficiently high impedance.
>Or am I misunderstanding something?
No. You can see another way to do this on N6LF's website.
73,
Jim K9YC
_
Jim Brown wrote on Monday, March 02, 2009, at 11:09 PM:
> A few quibbles with your analysis. First, the antenna that I have
> described is
> a simple half wave dipole, fed at a current maxima. The only tricky part
> is
> the power rating of the choke that serves as the end insulator. My choke
>
Ron,
A few quibbles with your analysis. First, the antenna that I have described is
a simple half wave dipole, fed at a current maxima. The only tricky part is
the power rating of the choke that serves as the end insulator. My choke is
NOT a matching element, it an end insulator!
Second, thi
For those that may be newer on the list that would like to see an
example of a good homebrew 1/2 wave end fed setup, here's a good one
(with pictures and schematic) on the QRP ARCI site. It was posted by
Steve Yates, AA5TB:
http://www.qrparci.org/content/view/59/55/
I've used a slight vari
Hi, Jim.
I had thought about that concept years ago when I was doing more casual
QRP portable operation (camping, Flight of the Bumblebee-type stuff,
etc), but I never tried it because I just assumed that the impedance at
the end of a "dipole" (i.e., where the choke would be on the coax) was
lman.qth.net] On Behalf Of Jim Brown
Sent: Monday, March 02, 2009 1:32 PM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] PAR endz-fed
On Mon, 2 Mar 2009 10:16:27 -0800, Randy Cook wrote:
>HOW MANY OF YOU ARE USING PAR ELECTRONICS END FEDS
This is a VERY easy antenna to build. Why would
Onderwerp: Re: [Elecraft] PAR endz-fed
I used a 10/20/40 last year at FD with good results. Usually "if I could
hear
'em, I could work 'em" was true, with the QRP caveat. Top about 35ft. in the
air, bottom just a few feet off the ground. This was before I had my K3,
but used the
On Mon, 2 Mar 2009 10:16:27 -0800, Randy Cook wrote:
>HOW MANY OF YOU ARE USING PAR ELECTRONICS END FEDS
This is a VERY easy antenna to build. Why would anyone want to buy
what they can build in an hour for a fraction of the cost? See
http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf
One h
Chuck
If your antenna is over salt water (even if that water in under the sand
which is under your operating position) you are going to be a VERY happy
ham. ANYTHING strung up of salt water will give absolutely fantastic
results!
Have fun with the PAR or anything else you use under those cond
ch 02, 2009 1:16 PM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] PAR endz-fed
I am using the 40m EndzFed at my QTH. It slopes from 10 ft outside my
shack to 40 ft up into a redwood tree. I do not have a lot
configuration for a decent 40M dipole. Although not recommended by
PAR, I
I used a 10/20/40 last year at FD with good results. Usually "if I could hear
'em, I could work 'em" was true, with the QRP caveat. Top about 35ft. in the
air, bottom just a few feet off the ground. This was before I had my K3,
but used the T1 with my FT817 and even used it on six meters for a fe
I have used a PAR end fed with my K1 at the beach. I feed it at the top and
run it from the condo balcony down at a slope to somewhere I can tie it off
where no one will run into it. It works very well - better than an Outback
vertical attached to the balcony. So far, no one has complained
I am using the 40m EndzFed at my QTH. It slopes from 10 ft outside my
shack to 40 ft up into a redwood tree. I do not have a lot
configuration for a decent 40M dipole. Although not recommended by
PAR, I have worked stations on 60 and 80 meters with it using the K3
autotuner.
I cannot co
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