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29.5 ft EFRW for QRP
Posted: Wed Jan 15, 2025 4:20 am
by Brian - K3ES
I built and tested an EFRW / 9:1 Unun antenna with 29.5 ft (9m) radiator and single 17 ft (5.2m) counterpoise. With Elecraft KX2 internal tuner, I can reliably tune 60m to 10m bands. I am using it for QRP CW field (POTA) operations, and have had a respectable number of contacts. Deploying it is very simple using a throw line over a tree branch to pull the radiator up with near-vertical geometry. It will be taking up residence in my field kit.
Re: 29.5 ft EFRW for QRP
Posted: Fri Jan 17, 2025 12:47 pm
by N5FY
This is a great configuration for the KX2! Great to hear good results. How long is your second counterpoise? I’m assuming you are using coax between the radio and 9:1.
Re: 29.5 ft EFRW for QRP
Posted: Sat Jan 18, 2025 4:51 am
by Brian - K3ES
N5FY wrote: ↑Fri Jan 17, 2025 12:47 pm
This is a great configuration for the KX2! Great to hear good results. How long is your second counterpoise? I’m assuming you are using coax between the radio and 9:1.
LOL! Second counterpoise was15 ft of RG316 in a bit of a curly-cue configuration. WX here kept me in the truck for my activations / testing. Feedpoint was clipped to the VHF/UHF antenna on the fender, and coax drooped down before entering through the bottom of the door seal.
Best 73 de Brian - K3ES