FERNANDO ESPINOSA: Dave very good work 9 of 9 parts,good electrical testings but I have never see the measurements of your beautiful antenna,any way sorry.
Paul Linnell: Thanks for the videos! I watched all 9! Great looking and working antenna!! The guy who went to simplex didn't wait for the repeater to drop before he transmitted, I think and that's why it sounded like the two hams were doubling. Maybe?? I'm going to put out a call to the local folks in the area and see if I can pickup some usable TV antennas as I want to build this antenna. I've been hamming for 50 years come this fall and now that I'm retired I want to experiment with some home brew antennas. Best 73! DE NØPL in Montana.
Darren Hoey: Looks like a quality antenna m8 . Well done
Ronaldus van Uden: clear and no noise on low power... fantastic!
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?
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
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?
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! :)
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?
love your videos by the way, thank GOD for ppl like you!
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! :)
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 ..
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! :)
N2RRAny: Nice project! Love DIY projects! Tnx!
Dave Tadlock: @HanceCYoung It works great. Please see my web site for additional notes. Thanks for watching and 73. :)
MrGekko82: @zerozedzed Ok thnx fore your comment i will take a peek and gone be al ride ! nice web site !
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.
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: @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. :)
Dave Tadlock: @n0mjs The repeater did sound great. Thanks! :)
Dave Tadlock: @K0YEQ Yes, get their autographs while you can. Don and EMR may become more famous than Gordon West, hi hi. ;)
6m/2m/70cm Yagi Antenna (Part 9/9) Built from Old TV Antenna5
out of 5