I saw a Youtube video yesterday from vendor night at this year's FDIM. IN it, Adam showed an antenna that has a 15 foot radiator and a 7.5 foot radial connected to a 4:1 unun that he said is perfect for the KH-1. Searching online shows that this is similar to the Rybakov 806 antenna but I couldn't find it on his website or Youtube videos.
Has anyone tried this type of antenna? My current "ultaportable" EFRW uses a 29 foot radiator and a 17 foot radial - this Rybakov-like design would work even better with my 7.2m collapsible mast (fishing pole).
Mike, KL7MJ
New K6ARK antenna?
Re: New K6ARK antenna?
I built an antenna this weekend with a 4:1 unun connected to a common-mode choke, with a 20 foot radiator and a 7.5 foot radial. I couldn't get it to tune up on 40, but could on 30, 20 and 17. I tried calling CQ using a TR-35 and checking for results on RBN. I was picked up by one station on 20m - nothing on 30 or 17.
As far as tuning on 40m, my ZM-2 seems to have a problem in the 6.5MHz to 7.5MHz region. I can get an antenna (or just the tuner) to load on 80m but it is difficult to tune on 40m.
I'm going to use the unun/cmc combination to build a rybakov antenna and see how that goes.
As far as tuning on 40m, my ZM-2 seems to have a problem in the 6.5MHz to 7.5MHz region. I can get an antenna (or just the tuner) to load on 80m but it is difficult to tune on 40m.
I'm going to use the unun/cmc combination to build a rybakov antenna and see how that goes.
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Re: New K6ARK antenna?
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
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
Re: New K6ARK antenna?
Adam talks about this antenna design at the 13:46 mark in this video:
https://www.youtube.com/watch?v=zlv6JYFxN9g
Other than the rybakov, I haven't seen a 4:1 for an EFRW design before.
That website looks great - lots of good information. Thanks.
73,
Mike, KL7MJ
https://www.youtube.com/watch?v=zlv6JYFxN9g
Other than the rybakov, I haven't seen a 4:1 for an EFRW design before.
That website looks great - lots of good information. Thanks.
73,
Mike, KL7MJ
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- Posts: 175
- Joined: Sat Jun 11, 2022 2:59 pm
Re: New K6ARK antenna?
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
https://wb3gck.com/2018/12/09/revisitin ... -vertical/
not a "great antenna" but it works decently and is quite easy to carry/deploy
Re: New K6ARK antenna?
The 4:1 has become my "go to" antenna for small portable operations when I have a tuner... Same configuration, 15' radiator and 7.5' CP. What I appreciate about my 4:1 winding is the efficiency is significantly higher than any other winding I have tested...over 99% actually with Back to Back testing. You can see here, it is quite the compact package. Not as small as the kit you can get from K6ARK (Amazon) to build though (his kit can do 9:1, 4:1 or 49:1).
Joshua
N5FY
N5FY
Re: New K6ARK antenna?
Joshua,
I like your setup! Did you print the piece that holds the BNC connector? It looks very useful.
73,
Mike, KL7MJ
I like your setup! Did you print the piece that holds the BNC connector? It looks very useful.
73,
Mike, KL7MJ