How to Calculate Multiple Banded End Fed Half Wave (EFHW)

I explain the basics of the End Fed Half Wave (EFHW) Antenna, and how i calculate the lengths of my antenna for my targeted bands. I also go over some harmonics and how this can be used to combine a couple of bands on a single antenna.
Links:
Centuriioneye 160 PCS Spade Connector - amzn.to/3lAMNB9
BNTECHGO 20 Gauge Silicone Wire - amzn.to/419yWSE
ARRL Band Plan - www.arrl.org/ba...
Antenna Formula - www.electronic...
Math Notes:
Target bands
10M = 29
15M = 21.325
17M = 18.139
20M = 14.25
40M = 7.2125
cut
Magic Number (468) feets
17M = 25.8, 25' 9.6"
20M = 32.84, 32' 10.08"
40M = 64.88, 64' 10.56"
Elements going to cut:
17M = 25.8, 25' 9.6"
20m = 7.04, 7' .48"
40M = 32.04 32' .48"
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[@chrissortman6826]

Awesome video Frang......finally a straightforward explanation of one of these things.... Most just skip over the details ...... Thank you.

[@TankRadio]

I noticed that too, that why i want to explain why i am cutting these sections to the specific lengths.

[@av3510]

Frankie with the Killa MS Paint Skilz!!!

[@TankRadio]

Its been a while since i need to explain something. I need to do it more. i love doing these deep dive

[@tomw4id245]

Frank, I met you in person at the pavilion in Huntsville last year. I complimented you then about your "teaching" videos and I'll say kudos again for another job well done!

[@TankRadio]

Your Welcome, i love doing these deep dive videos and the response i get from them. I need more suggestions on what other topics i can tackle.

[@phillyedhrj]

God bless you for doing maths, Frank! Well done!

[@TankRadio]

My pleasure!

[@freetimeelectronics2341]

Frank !! Looking forward to the rest of this. This stuff is great. Just what I need. Hands on is great. You bring it down to what I need to understand.

[@TankRadio]

Thank you Sir. I love breaking down ideas and concepts

[@Grandpa_Reed]

Very good explanation Tank Radio

[@TankRadio]

Thank you, i hope i helps some of ya'll out there

[@DonzLockz]

What did you do with the real Tank Radio? You are serious, no yelling intro and doing math!😄 Good video Frank. 🍻🤠

[@TankRadio]

😁, i will be back next video

[@Cunneyworth]

I am building one now, and was looking for a video exactly like this. Well done and thank you.

[@TankRadio]

Thank you sir, i built this antenna and i works great. Just trying to find the right day to schedule the video.

[@Cunneyworth]

@@TankRadio Awesome. I just built the K6ARK 100w antenna and want to make it a multiband and linked antenna.

[@TankRadio]

@@Cunneyworth rock man, that's Ham Harder

[@Cunneyworth]

@@TankRadio My first HF antenna build. I like to bite off more than I can chew then get angry when it does not work. Kind of my thing :)

[@TankRadio]

@@Cunneyworth persistence and learning from our mistakes. That's what makes this hobby great man

[@SkyCharter]

0:44 One defines the dipole antenna not by form, but by function. IEEE 145-1993… “dipole antenna (antennas). Any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole. Syn: doublet antenna. NOTE: Common usage considers the dipole antenna to be a metal radiating structure which supports a line current distribution similar to that of a thin straight wire so energized that the current has a node only at each end. Fed in the center, end or anywhere in between, it's still a dipole antenna.

[@TankRadio]

Interesting, so classification, End feds and middle feds are the same type of antenna. TODAY i learned.

[@vicmiller7191]

Great Video Frank, I am looking foward to the next chapter of this video series. 73 Vic de KE8JWE

[@TankRadio]

You and me both! I am hoping this weekend if it doesn't RAIN

[@ww7gbaradio382]

Frank great job! I really enjoyed the video and it cleared one of the questions I was going to research, namely overall length. We got tons of snow here right now. I have to do some antenna repositioning, as well as crossing some Ts and dotting some i's with both my 20/17/12 fan dipole and a 40 dipole that I use for 40 and 15 meters. Unfortunately, I do not have the room for 80, let alone 160. This winter season, snow has taught me a lot about antenna placement/arrangement/positioning in summer vs winter. So once everything melts around here, I need to get out there and make the fixes. That Rig Expert really helps, but it is also a great teaching/learning tool. I am new to HAM Radio, got my gen on 8/30/21. This spring/summer I want to make an EFHW that will work on 40, 15, & 10. I need to add 10 to what I currently have. I want to set it up as a "sloper". I can put the end fed portion on my roof at 35 feet, and then slope it to a nearby evergreen that is about 50 feet high, so it would be sloping from 35 to 50 feet. My question is, I want to be able to run 600 watts. On these antennas, what dictates the max power rating of the antenna? Is it the wire gauge? If this goes well, then I plan to make another two EFHW for POTA, those would be low power, below 100 watt. I plan to get an 891 later this year. I live in NE Utah outside of Park City. We have several POTA & SOTA national and state park destinations really close by, figure 15 to 25 minutes away. 3 hours to Yellowstone & the Tetons. So it is ALL good stuff in our neck of the woods when it comes to POTA. 73 Louis WW7GBA

[@MikeN2MAK]

Off to a good start, Tank. Looking forward to seeing how it turns out!

[@TankRadio]

Me too, i will build it this weekend =)

[@TankRadio]

I MISSED the Premier, Sorry i was Driving

[@Wayde-VA3NCA]

Hi Frank, consider cutting the 40m towards the low end (but still in) the phone section, then you may find that the higher bands fall closer to the phone sections, and you might find a balance where less tuning overall is needed...

[@TankRadio]

You are correct, and i didn't really address this in the video. I choose not to do this so i can better have better 1:1 residence on the other elements.

[@wild-radio7373]

Thank you!👍

[@TankRadio]

Your always welcome, anything for my biggest fan

[@K3KTB]

Nice video

[@TankRadio]

Thanks you sir, i will be trying to build the antenna really soon. I had some issues the first try.

[@jbaker389]

Math Check, someone please. If we wanted to create the "magic do it all" linked EFHW targeting the middle (voice and data) of 10, 12, 15, 17, 20, 30, and 40. we would get the following targets: 10 - 28.15; 12 - 24.94; 15 - 22.225; 17 - 18.118; 20 - 14.175; 30 - 10.125; and 40 - 7.15; Looking harmonics we would need 4 sections, one for 12, 17, 30, and 40 (40 can give us 20, 15, and 10. We could do a 20 (for 20 and 10) to shorten how much wire we put in the air but its not critically needed). Using the math 468/f gives us the following: 12 - 18.765ft; 17 - 25.83ft; 30 - 46.23ft. and 40 - 65.45ft. Separating should you do it, is this math right enough that you could do it?

[@kzerobkobrian8937]

\o/

[@TankRadio]

Tanker @KzeroBKO Brian