InTheNameOfJustice: Great job. Can I ask a question? Does it matter how big the elements are?
For example, could they be made much wider, say four inches wide by a
couple of millimetres thick or would that have an adverse effect?
Ronaldus van Uden: clear and no noise on low power... fantastic!
Dave Tadlock: @K0YEQ Yes, get their autographs while you can. Don and EMR may become more
famous than Gordon West, hi hi. ;)
Dave Tadlock: @n0mjs The repeater did sound great. Thanks! :)
bootlegger123: Dave, you said to make the driven longer, dio you mean the element or the
feed wire between the 2 driven elements (2m and 70cm)? also would the
measurements on your website be the corrected length of the 2m driven
element? Thanks, love your videos by the way, thank GOD for ppl like you!
K0YEQ: I think I will ask Don and EMR for their autographs. Very nice series of
videos Dave, I really enjoyed them. Fred, K0YEQ, Lecompton KS.
DouglaskaT: Hi.. great videos. I am new to this.. I don't even have a radio yet.. zero
funds... well, almost. I do have a couple of questions. Where can I find
more info on how to make the calculations? Isn't there somewhere that can
tell me exactly what I need to do? It seems all a bit confusing ( I know..
it won't always be that way ). thanks! KD0QAW ..
HanceCYoung: Greetings, love the videos, was wondering if you had tried out the 6 meter
yet. I understand it is starting to open up, would love to know how it
worked. Thanks, 73s Hance Young KK4BOZ
Dave Tadlock: @HanceCYoung It works great. Please see my web site for additional notes.
Thanks for watching and 73. :)
Dave Tadlock: The basic yagi formulas used to be in the General class study guide. Also
the ARRL Antenna Handbook is an excellent source of information. Many hams
use yagi antenna modeling software. Using the software you'll find that the
lengths and spacing of elements can be varied. It's up to the builder as to
how much forward gain versus front-to-back ratio an antenna has as we can't
have the best of both. I'll try to add some links to some free antenna
modeling software on my web site. Thanks & 73! :)
Dave Tadlock: @dbindner 2 Meters and 70 cm together is fine and so is the spacing of
12-3/8". You may use any equal spacing of .15 to .25 of a wavelength for
either band. 6-3/16" should be very close to a 1/4 wave on 70 cm. This vid
is an example of how to build three separate beams and mount them on the
same boom with a common feed-point. Try using the element lengths from the
2 m gamma match beam as these in this vid came out just slightly short. 73
and have fun! :)
StarCruiser Cj: Great Work Dave! First I heard of using old TV antenna, Now I want to try
this, I enjoy 220 Band here in my QTH , as it covers an Earthquake watch
Link of Repeators for Califonia!...... 73sssss Chris
MrGekko82: @zerozedzed Ok thnx fore your comment i will take a peek and gone be al
ride ! nice web site !
Fabio Negreiros: Good evening, I'm from Brazil, living in a rural area, I would build a
25dbi antenna for mobile and modem, and could help? Eugenio Negreiros
MrGekko82: hello there first i wanne say; Respect fore all your video s!! second i am
going to build that antenna but i have some questions about the segments of
the boom.. 1 segment of the 70cm total lenght = ? in cm 1 segment of the 2m
total lenght = ? in cm 1 segment of the 6m total lenght = ? in cm .and the
lenght of the boom in cm If you could answer those i woud be very pleased!
the rest i will figure out :) im a metal worker so the alu metal isn t a
problem .. greets Gekko
Dave Tadlock: @MrGekko82 Sizes for this antenna have been posted on my web site at
amateurradio.bz but are in english. You will need to convert the
measurements to centimeters. Also be sure to notice, in this video, how the
coax cable is brought down from the rear near the reflector. You may also
customize the antenna anyway you like by adding more elements. Formulas for
yagi antennas can be found in the (US) General class amateur radio
licensing study guide.
Dave Tadlock: @jichus1 I built the antenna just before cold weather arrived and it will
be spring before I can give it a good field test. I imagine that will do
very well on 6 meters if band conditions are good. Thanks and glad you
enjoyed the videos. :)
N2RRAny: Nice project! Love DIY projects! Tnx!
Dave Tadlock: I meant to make the elements longer. The lengths on the website are
slightly longer than shown in the video. If you'd like to add more elements
on 2m & 70cm you can also use most any other dipole driven yagi antenna
design. The antenna still needs some tuning but is a worthwhile project.
Thanks for watching and 73! :)
n0mjs: Awesome antenna! It sure makes that 440 repeater sound good :)
6m/2m/70cm Yagi Antenna (Part 9/9) Built from Old TV Antenna5
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