Another answer for Darrell, is that a balun is designed to see equal antenna
halves either side of it. (on its balanced side).
There is no advantage to using one on an end fed dipole.
If you were to feed with coax, to an end fed dipole, and that coax is
quarter wave long, you would transform
Jay wrote:
All tuners will eat up some percentage of your RF output power.
The ones with toroid or smaller inductors may eat up more power.
Jay, John, etc.:
The physical size of the inductors would only be a factor if they were
also inefficient (dissipating a lot of heat). In all of our
So far I've not bothered with a balun when running my KX1 into a
dipole fed with balanced line (using the internal tuner to match) and
seem to have pretty good results, better than the random wire and
counterpoise so far (portable operation over poor ground). My thinking
was that since the whole
: Monday, August 08, 2005 9:30 AM
To: Elecraft
Subject: Re: [Elecraft] ATU efficiency and the Elecraft T1
So far I've not bothered with a balun when running my KX1 into a
dipole fed with balanced line (using the internal tuner to match) and
seem to have pretty good results, better than the random wire
L. B. Cebik, W4RNL, explored the im balance of the end fed Zepp antenna,
a half wave with open wire feed where one side of the wire connects to
nothing, and the other to the antenna end element.
That would seem to be the extreme case of current imbalance but he found
typically, there is only
On 8/8/05, Stuart Rohre [EMAIL PROTECTED] wrote:
This was done for a floating system, or a closed system, ie dipole in space,
no other ground. That would pretty well approach the floating system you
have used on rock.
Well, my thinking went like this:
Imagine I connected a 3/4 wavelength
On August 8, 2005 01:39 pm, Stuart Rohre wrote:
L. B. Cebik, W4RNL, explored the im balance of the end fed Zepp antenna,
a half wave with open wire feed where one side of the wire connects to
nothing, and the other to the antenna end element.
That would seem to be the extreme case of current
Darrell,
It all depends on the electrical length to the feedline at the frequency of
operation. Sorry, but no better answer exists.
If your antenna is end fed (like the example of an end fed dipole), the
impdance at the antenna feedpoint will be high, but if the feedline is an
odd multiple of a
On August 8, 2005 07:03 pm, W3FPR - Don Wilhelm wrote:
If your antenna is end fed (like the example of an end fed dipole), the
impdance at the antenna feedpoint will be high, but if the feedline is an
odd multiple of a 1/4 wave (elecrtical), the impedance presented to the
shack loaction should
Darrell asked:
So how would the Elecraft BL1 Balun do with the End-Fed Zepp? Depending on
the
ground losses, the impedance could be 5000 ohms or so. Would the 4:1
transformation ratio still hold true? What would the efficiency of the balun
be? Would 100 watts from a K2/100 cause saturation of
On August 8, 2005 07:30 pm, Ron D'Eau Claire wrote:
Many Hams try to use lengths other than 1/2 wave for the radiator and 1/4
wave for the feeders. When you do that, all bets are off. It's like any
non-resonant doublet or end-fed wire. They can work well, but you must
have a matching network
Message -
From: Darrell Bellerive [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Monday, August 08, 2005 10:49 PM
Subject: Re: [Elecraft] ATU efficiency and the Elecraft T1
On August 8, 2005 07:30 pm, Ron D'Eau Claire wrote:
Many Hams try to use lengths other than 1/2 wave for the radiator
Paul, KD3JF wrote:
My only comment is, first of all I am not an engineer and I am not savvy
always on the ins and outs of antennas, but my gut feeling is that a L
network tuner is the better for all circumstances than a T network tuner.
Good 'gut'
Darrell,
In your example, the 160 meter half wave will work FB on 160 meters with a
feedline that is 1/4 wavelength at 160 meters. For all other ham bands, the
situation is different - the antenna length will still be a multiple of 1/2
wavelentghth, but the feedline will also be a multiple of a
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