[NLRS] Isosceles Triangular omnidirectional 6-meter loop antenna impedance matching

[JamesDuffey]

Russ - I assume that the “loop” is really an approximately half wave dipole with the ends partially folded back to form the triangle, so that it is an open circuit opposite  the feedpoint. - Duffey

James Duffey KK6MC
Cedar Crest NM

> On Jul 20, 2021, at 10:26, Russ Ramirez <russ.ramirez at gmail.com> wrote:
> 
> Loops and triangles should be full wave in order to get a close
> impedance match @ ~100 ohms, with the imaginary reactive component being
> strongly inductive. If the loop is full wave, then 2.0:1 VSWR would be
> expected "in theory". 3.1:1 seems in range for such an antenna without a
> balun.
> 
> Russ
> 
>> On Tue, Jul 20, 2021 at 10:37 AM Carl A Estey <CARL at esteys.net> wrote:
>> 
>> Hello all;
>> 
>> At the tailgate swap fest a few weeks ago I bought a loop antenna for
>> 6-meters.that looks similar to the PAR Electronics OA-50.  I tried the
>> antenna yesterday and it works poorly.  There is a slight decrease in SWR
>> at 50.5 MHz but it does not get below 3:1.
>> 
>> I discovered that the antenna uses a gamma match as compared to the PAR
>> which uses some sort of sealed mystery “matchbox”.  I suspect that this
>> mystery tuning box has some sort of current choke and may be a 4:1
>> impedance matching choke.
>> 
>> Does anyone know what is in this mystery tuner and have suggestions as to
>> how I might make this antenna work?
>> 
>> 73
>> Carl WA0CQG
>> carl at esteys.net <mailto:carl at esteys.net>
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