QW Edginton 40 Meter Antenna


Model: "QW 40m Edginton Loop using Heliax Cap and gimmick trimmer"



View of  the 40m Quarter Wave Loop:
The Heliax cap is the black object at a 45 deg angle with a white 'loop' hanging out of it.  

QW 40m Edginton Loop on Crossed Cane Poles



Looking up at the loop from below:

Looking up at QW 40m Edginton loop





Another view looking up at the loop from below:

Another view looking up at QW 40m Edginton loop




The 10 inch fixed Heliax cap:

The fixed Heliax cap and gijmmick trimmer




The trimmer used with the fixed Heliax cap to tune the whole 40m band:

Top of fixed Heliax cap plus gimmick trimmer



Bottom of cap:

Bottom of Heliax cap




Variable mechanical cap tried earlier. Also note the ferrite transformer (wrapped in the blue tape).
Note how the plates of the cap are hardly meshed.
The Type 43 material ferrite transformer has 3 1/2 Turns on primary (coax) side and 2 Turns on the secondary (antenna) side.

Fixed cap tried eralier and ferrite transformer




Sketch of dimensions: Total length of wire is 8' per side by 4 sides = 32 feet

Sketch of dimensions




BW Measurement and Q calculation:

BW Measurement and Q calculation



WSPR spot result in Japan:

WSPR spot in Japan



WSPR spot result on Russian island east of mainland Russia:

WSPR spot on Russian island