[Elecraft] Horizontal Loop question

[Richard Collier]

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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