Table of Contents
End Fed no Tune Antenna by GRPguys V2 High Power version
Introduction
I was very pleased with my first antenna at the QRA : End Fed no Tune Antenna by GRPguys build
The antenna is rated at about 10W and my FT818-ND is already 6W output. I plan to add a 50W amplifier so this antenna will be unusable for that kind of power.
So I decided to make exactly the same antenna, but also change the toroid and the wire sections.
The build
I've used a FT240-43 toroid which is known to be used up to 100W.
For the wire for the transformer, I've used 0.75mm² wire with only one conductor. I didn't have some magnet wire so I've used standard cable, without removing the insulation :
After that, I've directly soldered the RG58 coax without any connector and put a 150pf capacitor of 15kV to be able to handle the extra power.
Everything has been installed inside an electric box I already had laying around :
The box was already opened with 3 holes, so I printed 3 caps with my 3D printer and glued them with epoxy glue.
2 holes of 5mm have been drilled for the antenna wire and maybe the counterpoise if needed.
The box is installed at about 6.5m near the roof of my house.
The wire has been cut to 19 meters of 0.75mm² multi conductor wire (standard for home purpose) and 25cm were folded back to achieve the tuning. I've a perfect match at the first time ! The end of the wire is at about 9m from ground, on a fishing pole.
On the first version (the 10W one), the coax connector has been snatched with the wind. So I've well attached the wire to avoid that :
And now, the happy guy !
For me, this antenna is very convinient at home, because you just need to install the box and the end of the wire as high as possible. You don't need radials of cables to tighten the system, so your YL will be happy with that !
