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Dead Electrical Dudes 20 and 21

from Philip Neidlinger, PE, KA4KOE on November 20, 2016
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Dead Electrical Dudes 20 and 21

Yagi-Uda Combo Special!


“Honey! Any snow on the TV picture now?”
Hidetsugu Yagi
Birth: 28 January 1886
Death: 19 January 1976


“Who Da’ Man? Uda Man!!”
Shintaro Uda
Birth Date: 1 June 1896
Death Date: 18 August 1976

AUTHOR’S DISCLAIMER:

As eleven (11) years have passed since I last besmirched the memory of a Dude, I expect to be cut a lot of slack from you boys and girls with respect to the quality of this essay. I’m a bit out of practice and may inadvertently inject an occasional comma splice or syntax error. Additionally, I may accidentally convert someone’s pet sacred cow into a pile of tasty USDA prime ribeye steaks. If the calls for my lynching do not reach a fever pitch, then I may churn out another inflammatory article in less than eleven years hence.

Now that the preliminaries are out of the way...It’s good to be visiting with you again! Some may remember when my 19th and last Dead Electrical Dude, Lev Termen, appeared here on 10 October 2005. A lot has transpired and I shan’t bore you with the details. Let’s just say I’ve been busy raising children and keeping the local sheriff from evicting K4SMN and I from the Neidlinger Estate and Country Club (NEC2). Memories tend to be short and I figured it was high time to give my reputation a booster kick back into the gutter where it so deservedly belongs.

How many of you have cursed when the gears of your Armstrong Super Rotator 2 have ground themselves into smooth metal disks as the large skyhook beam came to a screeching, bank account emptying halt? Or, used a homebrew, handheld beam antenna to hunt down and skin alive an offending barbarian who has the utter gall to interfere with your local repeater group’s weekly “Aches and Pains Net”? Have you decorated your brand-spanking new pick-em-up truck/SUV/POV/VAN/Hummer with a minimum of 10 directional antennas in a holy quest to be anointed the highest-scoring rover in a VHF/UHF contest? By the way (Note: A good rule of thumb dictates that a rover antenna installation isn’t worthwhile unless your gas mileage is reduced, via increased air drag, a minimum of 34.9%), if you answer “yes” to one or more of the preceding questions, then the likelihood that a Yagi-Uda antenna was part of the mix is indeed high. If you say “no” to any of the aforementioned questions, then you’re poor, like I am, or don’t get out very often.

Examples of common verbiage when hams refer to their parasitic directional antenna arrays may read something like:

“My Yagi was busted up real bad when the twister went through the back 40 last night!”
“The HOA thinks my Yagi and kids are ugly and will destroy their property values”.
“The XYL says it’s her or the Yagi.”
“I can’t have an effective station without a Yagi on a 150’ tower and a 5 KW equalizer.”

Lots of techo-jargon, slang, and half-truths pertaining to Yagi-Uda antennas are floating out there in the ether. Turn on your radio, spin the dial, and someone, somewhere is bound to be talking about their favorite Yagi-Uda and why it is the best thing since sliced bread. I venture that most never mention, much less know about, Mr. Shintaro Uda. Who in the blazes is Uda? Shintaro’s last name rhymes with “Barracuda”—which can be either a mean, toothy type of carnivorous sea fish or a neat and cool Plymouth from the halcyon years of my golden, lost youth. In order to help the kind reader avoid possible confusion, please note the following figures:


Figure1
Yagi-Uda for 160/80/40m belonging to my friend Dave, G0EVY with crane rotor. The massive array is homebrew and tips the scales at over 1000 pounds!


Figure 2
1971 Plymouth Hemi-Barracuda.


Figure 3
This is how a typical Yagi-Uda sorta looks like from above.

Figure 3 is a generic version of the Yagi-Uda beam. This particular one has one reflector on the left, a driven element where RF is applied, and two directors. For those who are really new at this, you point the end labeled “Forward” towards the station with which you wish to communicate. Finally, regardless of the operating bandwidth, it’s really not a great idea to stand in front of the “Forward” end while the RF is coming out, especially if you are squeezing lots of RF into the sucker from the transmitter. Yeah, I know, it MAY be okay, but once you get into the mid-HF to low-VHF and above range (someone please check me on this), things get dicey. Remember, the first thing to get cooked is the aqueous humor of your eyeballs in a manner similar to boiling an egg. YUCK!!!

The electric field polarization (there is also a magnetic H component oriented 90 degrees catty-wampus to the other field) is which way the elements are oriented in relation to terra firma; horizontal elements = horizontal polarization while vertical elements = vertical polarization. This orientation sometimes doesn’t mean a whole lot since once your “CQ!” bounces off one of those Kennelly-Heaviside layers (er….ionosphere), all bets are off. I think I read somewhere in Terman’s Radio Engineers Handbook (1943) that the reflected polarization is elliptical. I’m not in the mood to look this up at the moment so the possibility exists I’m dead wrong.

There are more variations of the Yagi-Uda beam antenna than Carter has pills. The sizes are dictated by the operating frequency, number of elements, mounting provisions, and desired forward gain. Finally, I am not going to dwell on the dense technical theory pertaining to the Yagi-Uda as that would definitely kill the mood I am trying to create. Search the internet and I am sure you will find something you can build that fits your needs. I can’t do all the work on this end!

Now that you have a pretty good idea of what a Yagi-Uda antenna looks like, let’s get back to my original question of the exact relationship of Mr. Yagi and Mr. Uda. Here is what I have dredged up from the internet. Both worked together at Tohoku Imperial University with regards to the antenna’s theoretical background, testing, and publishing of the test results in 1926. Both of their names were also on the documentation.

Additionally, an English language article was published by Yagi in 1928. Somehow, Uda’s name was, for some reason, omitted in the translation. Perhaps this is why English readers only knew about the antenna by the name at the top of the article.

The outbreak of the Second World War wasn’t that far way when the inventors’ paper was published. This following is likely apocryphal and I am unable to verify it’s veracity: the Allies and Germans all used the Yagi-Uda antenna for various communications devices and weapons systems. The Imperial Japanese High Command was unaware of the antenna’s very existence until some Allied communications equipment was captured. One of the antennas was weird looking and had the word “YAGI” engraved on one of the elements: an “AHA” moment followed. Interesting!

Well, that about wraps up this combo special. I hope you have enjoyed this essay and motivate you to do some research on your own. If you find any blatant errors, then please be kind in any subsequent criticism.

Respectfully Yours,
Philip Neidlinger, PE, KA4KOE

Post Script:

For those newbies who wonder why the two Dudes described herein are numbered 20 and 21, there are 19 more articles lurking in the Eham archives. Since I am a fairly decent sort, I’ve included the links below:

1. Maxwell: http://www.eham.net/articles/6711
2. Tesla: http://www.eham.net/articles/6962
3. Armstrong: http://www.eham.net/articles/6974
4. Marconi: http://www.eham.net/articles/6976
5. Ohm: http://www.eham.net/articles/7075
6. Volta: http://www.eham.net/articles/7252
7. Hertz: http://www.eham.net/articles/7398
8. Morse: http://www.eham.net/articles/7527
9. DeForest: http://www.eham.net/articles/7896
10. Fessenden: http://www.eham.net/articles/7896
11. Henry: http://www.eham.net/articles/8277
12. Ampere: http://www.eham.net/articles/8857
13. Faraday: http://www.eham.net/articles/8858
14. Fleming: http://www.eham.net/articles/8873
15. Steinmetz: http://www.eham.net/articles/9517
16. Popov: http://www.eham.net/articles/9605
17. Oersted: http://www.eham.net/articles/10603
18. Coulomb: http://www.eham.net/articles/10693
19. Termen: http://www.eham.net/articles/12216

Enjoy and Let’s Be Careful Out There!

All material copyright 2016
Via Creative Commons

Member Comments:
This article has expired. No more comments may be added.
 
Dead Electrical Dudes 20 and 21  
by K9JCS on November 20, 2016 Mail this to a friend!
Thanks, Philip. Your article brought a smile to my face and has given direction to my radio communications.

73,

Jim
 
Dead Electrical Dudes 20 and 21  
by NN2X on November 20, 2016 Mail this to a friend!
Fun reading! And for those who are new, that was great way to inform the Engineers who created the wonderful Yagi-Uda antenna.

While you are in the writing mode...Please give the some fun reading on Quad Antenna...(I like that one, as the person who invented the Quad, was not an Engineer!)

Best

NN2X
 
RE: Dead Electrical Dudes 20 and 21  
by AA4PB on November 20, 2016 Mail this to a friend!
Welcome back! I can't believe it's been 11 years already.
 
Very Nice Change --- For A Change!  
by VE3CUI on November 20, 2016 Mail this to a friend!
It's really gratifying to read POSITIVE responses to these posted articles for a change, rather than being subjected to bursts of hellfire & brimstone from ever-present "flamers"…!

I forget just who, specifically, was credited with coming up with the quad antenna design --- however, I DO recall that it was someone at HCJB in Quito, Ecuador, who was struggling to find an answer as to why the ends of the directional array used at that religious shortwave BC'er were burning-out in the high-elevation of the station. The solution was as simple as, "Ends burning out…? Then ELIMINATE them!"

Or SOMETHING like that…

On a different note, here's a local urban legend re. the '70 'Cuda: stories had it that, in the late 70's, your proverbial "...little old lady from Pasadena" was selling a low-milage hemi-powered Barracuda for a song here, because of her advanced age; she supposedly bought the car with the hemi engine because she liked to tow around a house trailer in the summer, & wanted the power that the hemi afforded her…

Or so the story went, anyway…FWIW!
 
RE: Very Nice Change --- For A Change!  
by KA4KOE on November 20, 2016 Mail this to a friend!
Once the kids got old enought that they were continually getting into mischief, my spare time decreased dramatically.
 
Dead Electrical Dudes 20 and 21  
by AA4MB on November 20, 2016 Mail this to a friend!
I did so miss the 'entered mortal coil' and 'assumed room temperature' comments. So I had to go re-read a few of your old ones.

Thanks for the entertainment!

 
RE: Dead Electrical Dudes 20 and 21  
by KA4KOE on November 20, 2016 Mail this to a friend!
Like I said....I'm rusty at this.
 
Dead Electrical Dudes 20 and 21  
by AA7LX on November 20, 2016 Mail this to a friend!
The historical Photographs were interesting and the fact that one could(by way of the Author's research articles/links)quickly learn and read up on those past individuals and their genius that made possible: Electricity, Electrical, Electronic Communications, Antenna Design, Radio, TV, and further inventions yet unknown... P.S. It was Clarence C. Moore, W9LZX in 1939 who invented the Cubical Quad for the Radio Station: HCJB, located at Quito, Ecuador. At an elevation of 10,000 feet in the Andes Mountains; HCJB at the time was designed to operate in the 25 meter shortwave broadcast band with a carrier power of 10,000 modulated watts. At the time of his Antenna Design and Invention, Clarence C. Moore, W9LZX was one of the Engineers at HCJB. '73 George, AA7LX
 
RE: Dead Electrical Dudes 20 and 21  
by W3TTT on November 21, 2016 Mail this to a friend!
WRONG - TOTALLY WRONG!!!!

"...This particular one has one reflector on the left, a driven element where RF is applied, and three directors..."

As anyone can see, there are only TWO director elements.

Otherwise, laughing out loud, rolling on the floor! Thanks for the article.

Joe W3TTT
 
RE: Dead Electrical Dudes 20 and 21  
by KA4KOE on November 21, 2016 Mail this to a friend!
Yeppers. Disclaimer/excuse time again. There are some other boo-boos in here but I'll let you guys post-proof this for me and see how many you can find.

No calls for my death yet. This is looking very good indeed. When DED 1 came out back in the days of yore, there were some folks who were GENUINELY OFFENDED that I dared write about the electrical demi-gods in this manner.
 
RE: Dead Electrical Dudes 20 and 21  
by W0FM on November 22, 2016 Mail this to a friend!
Holy cranberry sauce, Philip. ELEVEN years! You will not believe the nonsense I've been forced to read in your absence. Welcome back my friend.

73,

Terry, WØFM
 
RE: Dead Electrical Dudes 20 and 21  
by KA4KOE on November 22, 2016 Mail this to a friend!
FM

Thanks! If you read DED 19, Lev, I stated I was learning the theremin. I actually built one out of vacuum tubes. That took up a lot of spare time!

https://www.youtube.com/watch?v=iokXM9zChaQ

Blood doesn't stream from folks ears anymore, nor do they run from the room screaming; which is a good thing. So, THAT and raising chillrens sapped up a lot of time. I apologize for the dearth of suitable reading material.

FLEEP
 
Dead Electrical Dudes 20 and 21  
by NL7W on November 22, 2016 Mail this to a friend!
Phillip!

Hams on this reflector gain knowledge and enjoyment through your historical writings. For all practical purposes, we're natural parasitic elements.

Keep up the good work... and thanks for taking the time to once again to put smiles on our faces. It's been a long time.

 
Dead Electrical Dudes 20 and 21  
by K1NSS on November 22, 2016 Mail this to a friend!
Philip,

If we look beyond your bluff good humor, we find a ham who enjoys his electromagnetic history and loves to share its fascinating personalities, brilliant inventors and technical tragicomedies.

Thanks for reminding many of us why we became hams.

Yeah, thanks a lot.

Jeff Murray
K1NSS



 
Dead Electrical Dudes 20 and 21  
by K9ZF on November 23, 2016 Mail this to a friend!
Have enjoyed all of your articles, although you are going to have to work on your timing :-)

I was aware of Mr. Uda-san, and even knew the antenna is more correctly referred to as a Yagi-Uda. But, like everyone else, I tend to drop Mr. Uda for the sake of brevity.

73 & keep those articles coming!

Dan

-- K9ZF
Vice President, Clark County Amateur Radio Club,
Amateur Radio Emergency Service,
Clark County Indiana.
EM78el
The once and future K9ZF /R no budget Rover
***QRP-l #1269 Check out the Rover Resource Page at:
List Administrator for: InHam+grid-loc+ham-books
Ask me how to join the Indiana Ham Mailing list!
 
Dead Electrical Dudes 20 and 21  
by W3UEC on November 24, 2016 Mail this to a friend!
I appreciate the information and the light-hearted presentation. You have done a FB service. Now for the nit-picking: It seems that Fessenden has the same URL and article as Henry. Did you put that in to check whether your readers are alert? Best holiday greetings ES 73 de W3UEC
 
RE: Dead Electrical Dudes 20 and 21  
by W6EM on November 25, 2016 Mail this to a friend!
Many thanks. Since both lived to impressive chronologies, perhaps we can put aside near-field radiation worries. Clearly, RF didn't fry either one of them.

Looking forward to your future work. Perhaps, when the antenna society finally decides to name the LPD after its creator, Robert Carrell. I made one years ago, but forgot to rotate the successive dipoles 180 degrees and it didn't work right......until I saw my mistake.

In the mean time, how about a short story on Siemens, "Mr. Conductivity," who replaced mho, "One over Ohm."

73,

Lee

 
Dead Electrical Dudes 20 and 21  
by W8LV on November 27, 2016 Mail this to a friend!
Welcome Back! ;-)

All the Best!

73 DE W8LV Bill

 
RE: Dead Electrical Dudes 20 and 21  
by KA4KOE on November 28, 2016 Mail this to a friend!
Reference Terman's "Radio Engineers' Handbook", 1943 Edition, Pages 729-730.

To paraphrase....

"Polarization Characteristics of Down-Coming Waves - Elliptical Polarization. The text indicates in further discussion LH orientation in the southern hemisphere and RH in the northern."

I finally felt in the mood to look this up and verify if anything I threw out there was correct.

BOOOM-YA!!
 
RE: Dead Electrical Dudes 20 and 21  
by KA4KOE on November 28, 2016 Mail this to a friend!
Reference Terman's "Radio Engineers' Handbook", 1943 Edition, Pages 729-730.

To paraphrase....

"Polarization Characteristics of Down-Coming Waves - Elliptical Polarization. The text indicates in further discussion LH orientation in the southern hemisphere and RH in the northern."

I finally felt in the mood to look this up and verify if anything I threw out there was correct.

BOOOM-YA!!
 
Dead Electrical Dudes 20 and 21  
by K1DA on November 29, 2016 Mail this to a friend!
The link to Fessenden doesn't work, it is the same url as the Deforrest link and takes one to the same place.
 
Dead Electrical Dudes 20 and 21  
by K3RKU on November 30, 2016 Mail this to a friend!
Great article Philip. I just gave a talk about beams at my radio club and started off mentioning professors Yagi and Uda.
 
RE: Dead Electrical Dudes 20 and 21  
by KA4KOE on November 30, 2016 Mail this to a friend!
I said there were errors! Here is the correct link for Fessenden:

http://www.eham.net/articles/7980
 
Dead Electrical Dudes 20 and 21  
by KD8GEH on December 1, 2016 Mail this to a friend!
Thanks for making my day Phil!
EVY is quite the character and also my fave Brit (san computers ). Please keep up the good work and the memories. I had a 68 Dodge Coronet with a 440 Hemi, oh the days :0

Best 73,
KD8GEH Dave
 
RE: Dead Electrical Dudes 20 and 21  
by KA4KOE on December 1, 2016 Mail this to a friend!
Dave is a British redneck and one of a kind!
 
RE: Dead Electrical Dudes 20 and 21  
by K4GLM on December 3, 2016 Mail this to a friend!
That Dodge Coronet 440 was LOADED with power.... but not a hemi. The Hemi was a 426...
 
RE: Dead Electrical Dudes 20 and 21  
by K4GLM on December 3, 2016 Mail this to a friend!
That Dodge Coronet 440 was LOADED with power.... but not a hemi. The Hemi was a 426...
 
RE: Dead Electrical Dudes 20 and 21  
by WD9FMB on December 21, 2016 Mail this to a friend!
Please don't make it another 11 years !!! I just turned 65 and may not be around when the next masterpiece comes out !!!

73

Fritz
 
RE: Dead Electrical Dudes 20 and 21  
by KA4KOE on December 26, 2016 Mail this to a friend!
Oh my! Now my head is swelling! You are much too kind!

73

Fleep
 
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