[TowerTalk] A different dipole design

[Jim W7RY]

Its also available on the QRZ.com home page.

I too watched it. I know Stan personally and have since before 2016.  I 
have operated THE 40 meter BEAM on CQWW RTTY single band.

I assisted him over the phone last weekend to get him up and running on 
RTTY, for the RTTY Roundup Contest.

It was a great interview.

Jim W7RY   Ozark Missouri



On 12/26/2024 11:16 PM, W7TMT - Patrick wrote:
> Kevin, W1DED has a great new interview on his YouTube channel with Stan that just was released tonight. Lots of personal history and info about his Cayman Brac station.
>
> W7TMT
>
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of john at kk9a.com
> Sent: Thursday, December 26, 2024 21:10
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] A different dipole design
>
> Thanks for sharing your design, Stan.  It is a very unique way of shortening a 40m element.  The design looks great to me and this idea could be useful on other bands well.  It would be nice to see photos of the 2el version that Kevin built.  For those that don't remember, Stan and Kevin owned and operated the Cycle 24 antenna company which supplied a great lightweight tribander for WRTC in 2014.
>
> 73,
> John KK9A
>
>
>
> Stan Stockton K5GO wrote:
>
> A few months ago I designed and my son built a 2L 40m Yagi using this type of design for loaded elements inspired by the W6NL style Moxon since that's what he was going to build.  The results are virtually the same in terms of gain, pattern, etc., but it is not as unwieldy and reduces the weight out on the element that causes it to sag excessively. TBD, but I believe it is less likely to interact with a 15m antenna.
>
> I have the need to put up a 40m dipole between a couple of towers here at ZF9CW.  If the towers were about 20 feet farther apart I would just put up a flat dipole but they are a little close spaced for that.  The element is going to be less than 50 feet long and it will be 50 ohm direct feed as opposed to about 75 ohms if it were just a normal dipole.
>
> For those who want to put up a dipole for any band, do not have the room for a flat dipole and do not want to either do some impedance matching with a 12th wave transformer or live with 1.5-1 SWR at best, here are the details of what I am going to find the time to do on 40 meters.  I will be limited to using the materials on hand. I would rather use #14 wire.
>
> 49 feet total (24-1/2 feet either side of center) of #16 wire fed in the center. At 15 feet out from center on either side there will be a 6 foot piece of 3/8" aluminum tubing that will be electrically connected in the center to the wire which will continue out for another 9-1/2 feet. So there will be 3 feet of aluminum tubing either side of center.  From the ends of the aluminum tubing there will be #16 wires that will connect to the end of the wire (24-1/2 feet out).  Those two wires should be ever so slightly slack so when the dipole is pulled up to its flat position there won't be any significant stress on the ends of the aluminum tubing.
>
> If you just draw this on paper it looks like a dipole that is 20 feet shorter than a normal dipole and near the ends you have what looks like an arrow.
>
> I have this skewed a little toward the bottom end of the band, but about 4 inches shorter overall length would give you less than 1.5-1 from 7.0 to 7.225.
>
> The gain of this dipole is about 1/4 dB less than a full sized dipole.  Its bandwidth between 1.5-1 points is about 25 khz less than a full sized dipole but only if you do a perfect job of matching your 50 ohm coax to the higher impedance of the full sized antenna.
>
> I probably won't do anything other than write this but if I get inspired I might sometime write it up for a magazine. I can see great benefit for those with limited space.  A flat dipole is so much better than what's commonly referred to as an inverted V.
>
> I'll be glad to send an EZNEC file to anyone who wants to get a better picture of the design.  Just send me an email.
>
> 73 and Merry Christmas.
>
> Stan, K5GO/ZF9CW
>
>
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