range.
73,
Steve N6VL
K2 #2289
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Goody K3NG
Sent: Thursday, November 15, 2007 11:00 AM
To: Elecraft List
Subject: Re: [Elecraft] KAT100 with Ladder Line
Using any balun with an unbalanced tuner to feed balanced
It can be quite tedious to build one's own ladder line. Wire size and
spacing between wires is a critical factor in determining the resulting
impedance of the line. Maintaining consistent spacing between wires
is difficult. For closely spaced wires (eg. 1.5 to 2.0 inch for 450 ohm)
slight
It can be quite tedious to build one's own ladder line. Wire size and
spacing between wires is a critical factor in determining the resulting
impedance of the line. Maintaining consistent spacing between wires
is difficult.
All of this is quite true. But let me play devil's advocate. I
I have not seen it mentioned yet, but the best installation of open wire
line will tension the conductors between 2 supports. That means fewer
spacers are required because the tensioned wires do not sway as much in
the wind.
For my part, PVC spacers are easy to construct and inexpensive.
Curt,
There seems to be a misconception among hams that when using 450 ladder
line, a 4:1 balun is the best thing to use. While that may be true in
some cases, in many other cases, a 1:1 balun will serve better. It all
depends on the feedpoint impedance of the feedline at the shack end, and
I admit I enjoyed using a KAT100 at FD, but I wonder
how much value it would be at my station.
For feeding my wire antenna with balanced line, I
suspect I need an external balun, that has to go
someplace, and better to be attached to one of the
tuner inputs. Currently I use a manual MFJ tuner
]
[mailto:[EMAIL PROTECTED] On Behalf Of Curt Milton
Sent: Thursday, November 15, 2007 11:50 AM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KAT100 with Ladder Line
I admit I enjoyed using a KAT100 at FD, but I wonder
how much value it would be at my station.
For feeding my wire antenna
Using any balun with an unbalanced tuner to feed balanced line can be
bad news (your mileage may vary, standard disclaimers apply). Under
highly reactive loads, a balun used like this can become quite lossy.
There's a couple articles in publications and on the Internet on this,
but Cebik's
On Thursday, November 15, 2007 at 7:00 PM, Goody K3NG wrote:
Using any balun with an unbalanced tuner to feed balanced line can be bad
news (your mileage may vary, standard disclaimers apply). Under highly
reactive loads, a balun used like this can become quite lossy. There's a
couple
You are quite correct. My favorite tuner of all is a link coupled
balanced tuner, and it is L B Cebik's favorite too - low loss and can be
configured to match just about anything - series tuning for low
impedances or parallel for higher impedances. I have built many over
the years. No balun
I've been using Cecil Moore's (W6RCA) No-Tuner with 450 ohm ladder
line for about 7 years along with a K2 / KAT-2 and it has been a
pleasure to use and pretty effective.
It's basically a box of 5 4pdt relays out in the yard that switches
in/out combinations of 16, 8, 4, 2 and 1 foot lengths
I've been very pleased with my MFJ-974, a true balanced tuner. My
measurements of feedline current with RF ammeters indicate that
overall it is as efficient as my home brew link coupled tuner with
plug in coils. I've used the MFJ tuner with several combinations of
feedline lengths and
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