[NLRS] yagi newbie questions

[Zack Widup]

All my lower band Yagis (50, 144, 222 MHz) are built on 1 inch square
aluminum tubing (plentiful in hardware stores around here). I drilled holes
through the tubing to clear the 3/16" diameter aluminum elements. The
elements contact the aluminum boom (non-insulated). I used element lengths
from a table in some VHF book that gave lengths of the elements for
insulated and non-insulated elements (they are slightly different). Each of
the elements is held in with a screw on the side of the boom parallel to
the elements. The screws are perpendicular to the elements. I use a T match
to feed them. I mounted a piece of 1/4" thick acrylic to the boom at the
appropriate location with screws and mounted the elements of the T match on
the other side. The elements themselves are 1/4" brass tubing and they are
tuned with sections of 1/8" diameter solid brass rod. I approximated the
dimensions in this article:

http://montoya.sdsmt.edu/ee483_583/notes/t_match.pdf

The 432 Yagi is similar but I used 3/4" diameter round aluminum tubing. The
driven element passes through a larger hole through the boom with the
element passing through a piece of teflon tubing with the ID being the
diameter of the element (1/4" brass tubing) and the OD being the diameter
of the hole through the boom.

73, Zack W9SZ



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On Wed, Feb 28, 2024 at 11:32 AM Aaron David Lewis <W0ADL at outlook.com>
wrote:

> Greetings.  I'm looking to get on the air from my QTH on 440, 900, and
> 1200.  I've been pointed to https://www.wa5vjb.com/yagi-pdf/cheapyagi.pdf to
> make my own.  I'm a total newbie and I understand about 90% of this but I
> wish it were more explicit.  It says to glue the elements to the boom.
> This sounds flimsy.  There's no mention of drilling holes into the boom
> which would seem better, but I don't know.  At the bottom I'm not really
> understanding the zip ties. I do have scrap RG-58.  should I keep this
> pigtail short and crimp/solder it to an n socket? Does anyone have photos?
> I admit I could do more googling.  Does anyone have surplus antennas they
> might want to sell?  Thank you.
>
> Aaron David Lewis
> W0ADL ◊ EN35hc
>
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