This morning I uploaded a YouTube video explaining the method for tuning any
2el parasitic array.
I do some experiments in my workshop using the Nano-VNA on a small 2 el Yagi to
explain mutual coupling. Then using 4NEC2 I show the relationship between the
dip in real R (point of maximum coupling) and the F/B and gain of the array.
Using this understanding any 2 el parasitic array can be tuned with confidence
on the tower by only sweeping the driver with the antenna analyzer. There is
no need to isolated the driven element and do analyzer sweeps on the parasitic
element. This method is especially useful for tuning arrays with non-split or
grounded parasitic or driven elements.
This is the method I used for tuning my 2 el 160m parasitic array that uses the
shunt-fed (grounded) tower as a driver.
73, de steve ve6wz
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector