The QRPer Board

I'll give it a go if we get some clear weather this weekend! That should be interesting, my suggestion is to start with one of the "recommended lengths" and analize it to obtain R/J at various frequencies (bands), at that point one may either act on the length or (probably better) decide ...

Folks, I've had this idea floating in my skull for some time now... but currently I don't have a VNA available, so I'm asking if someone ever tried what follows When it comes to EFRW antennas we're still following some rather old and established rules about the radiator length and the use of a 9:1 t...

well, yes and no; a reference table or "calculator" will help avoiding some lengths which won''t "load" on some bands, so it's useful, then one may want to use an EFRW at home, so a reference may and probably will be useful :D As for lower bands (say 80m) then it's mostly about c...

As for the EFRW radiator (wire) length, the "calculator" found here

https://k7mem.com/Ant_End_Fed.html#Not_Random_Multi

helps selecting a proper length depending from the desired bands

just an additional note; a workaround to such issue is to either use a 10m halfwave on lower bands, down to about 20 meters, accepting the obvious performance penalty, or set up the antenna as an inverted L

After this post on qrper.com https://qrper.com/2024/09/jeffs-backcountry-pota-adventure-campbell-brown-ecological-reserve-activation/ looking at the contacts map and the bands used I started thinking and, to verify that my thoughts were correct I then fired up the free 4NEC2 modeler https://www.qsl....

you could cut an EFHW, add some wire with a spade connector to make it an EFRW and carry two transformers, a 9:1 and a 49:1 I'd maybe have a disconnect in the EFHW wire at an EFRW-friendly length - 35.5 or 29 feet. That's another way to do it, you start with a length of wire matching a "good l...

I would want to carry two different types of antennas, if possible. One, a wire antenna, either an EFHW (without a tuner) or an EFRW (with a tuner). The other a DS-1, PAC-12, magloop, or some other not-too-tall antenna - if for some reason you can't use the wire antenna. 73, Mike, KL7MJ you could c...

just in case

https://wb3gck.com/2018/12/09/revisitin ... -vertical/



not a "great antenna" but it works decently and is quite easy to carry/deploy

try using a 9:1 followed by a choke, for the radiator size, use this https://k7mem.com/Ant_End_Fed.html#Not_Random_Multi as for the "counterpoise" a 1/16 wave wire at the lowest frequency will be a good starting point, willing to "go vertical" install the radiator as an inverted L