On Sep 14, 5:52*pm, Chuck Forsberg WA7KGX N2469R
wrote:


what is the easiest/cheapest way to add the decoupling?
Just add some 1/4 wavelength radials 1/2 wavelength below
the arx2?

The factory version uses some kind of donut thing with
threaded holes for the radials. In my case, I just rigged
up a L plate of sorts that I drilled a hole for a coax union.
I used stiff wire radials that I bent into a short L at the end
and clamped them to the mast at that same plate.
The plate and radials naturally are grounded to the support
mast. You run a 50 inch length of coax from the feed point
down to the union on the radial/union plate. Adjust the
clamp so it's fairly taut. The radials are 20 inches long.
Not much to it. The trickiest part is making a union plate
and clamping it to the mast. Just use your imagination.
Not really critical as long as it's stays in place and grounds
to the mast. You can buy the threaded coax unions at
most of the radio parts stores. Maybe even rat shack.