I use a 80 meter vertical loop with about 124' of 450 ladder line to a 1
to 1 current balun right outside the window. A 3 foot piece of coax
goes to the tuner (this coax should be as short as possible). You will
find that the Elecraft tuners will cover a broad range. Mine covers all
bands excluding 160. Actually it will tune 160 but with an amplifier, I
expect extremely high voltages at the balun. On 160 you could tune it
against ground if so inclined...
The antenna is a delta loop with the top at 120' in a pine tree. The
bottom wire is at about 50' and it is fed about 1/3rd up a vertical
side. It is an excellent performer and depending on where the lobes are
on the higher bands, it sometimes beat my 3 element tribander. On 40 it
really shines.
There is much written on the net on current baluns vs voltage baluns and
1 to 1 vs. 1 to 4. Also, much is written on common mode current.
Richard
K7SD
On 11/29/2015 10:17 PM, n7tb wrote:
I currently have a horizontal loop at my QTH being matched by an Icom
AH-4
Tuner. It is interfaced with my Icom 756. I will be running a
new-to-me K2
with the auto tuner installed. Right now, the loop is connected at
its end
points to 450 ohm ladder that has one leg attached to the tuner's
antenna
connector and the other leg to the ground lug. Coax comes from the
tuner to
my rig and works great on my Icom 756. Now for the several questions.
1. the AH-4 interfaces with the 756 via a four conductor molex
connector.
Is there some way to take those 4 wires and interface them to my K2
and let
the AH-4 tune the loop instead of the internal K2 tuner?
2. I presume it possible to take the coax feed from the A-4 off my
756, or
have an antenna switch do that, and attach the loop coax feed to my
K2, then
turn on the 756 to the same frequency that I want to transmit on the
K2, and
press the tune button on the 756 to tune the loop?
3. I could manually take 450 ohm loop antenna connection off the Ah4,
attach it to a balun attached to another length of coax that attaches
to the
K2, but this is very cumbersome. Perhaps an antenna switch is available
that has two balanced feedpoints and a coax feedpoint that would
allow me to
switch remotely? Does anyone know of such a thing?
4. If I decide to feed the 450 ohm twin lead to coax to my rig, what
type of
balun do I need? 4:1 or 1:1?
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