Laport's 'Radio Antenna Engineering'
David Platt (AE6EO)
on
October 4, 2005
View comments about this article!
Edmund
A. Laport's textbook Radio Antenna Engineering was
published in 1952, and presents an excellent overview
of the state of commercial antenna system engineering as practiced
in the first half of the 20th century. As its name implies, it's not
solely about electromagnetic or radio or antenna theory
although
these issues are certainly a part of what it talks about. Rather,
it focuses on matters surrounding the nuts and bolts (and logs, beams,
bars, wires,
and insulators) of actually designing and implementing a large-scale
antenna
system. As Laport writes,
There are three basic aspects of antenna engineering. The first
pertains to radiant energy in space around an antenna system, as
well as the current distributions that produce the radiation pattern.
The second pertains to antenna circuitry and involves such matters as
self- and mutual impedances, currents, potentials, insulation, and
feeder
systems that will yield the desired current distributions. Third there
is
the structural engineering which has to do with all the mechanical
details
of supports, rigging, materials, strengths, weights, hardware,
assembly,
adjustability, stability, and maintenance. While each aspect must be
separately developed, the final design must be an integration of the
three,
with a minimum of compromise and within reasonable economic limits.
The book includes an introduction to radio theory (referring the reader
to
works by Kraus, Terman, and others for more detail). The first three
chapters
discuss the specification and design of large antenna systems, broken
down
by the frequency ranges they serve: low frequency, medium frequency,
and
high frequency. Three additional chapters discuss transmission lines,
impedance matching techniques, and logarithmic potential theory. Each
chapter is well supported by drawings, charts, photographs, and an
extensive
bibliography of references.
Radio Antenna Engineering is noteworthy for its
collection
of photographs of early and mid-20th-century radio transmission
facilities
and construction practices. It also has an extensive discussion of HF
long-wire antennas, including single-wire types, V designs, rhombics,
and fishbones.
Radio Antenna Engineering is certainly of
significant historical
interest, and may be of practical use as well. Although some of the
designs
and practices portrayed in it have been supplanted in commercial
service,
much of its content can still be of significant value to amateur-radio
operators and to those interested in the practical aspects of
high-power
radio operation in the lower-frequency RF bands.
Unfortunately, this book has been out of print for several
decades. Used copies have been difficult to find, and expensive
to buy. I'm told that Laport (now a silent key) sold his final
stock of new copies a couple of decades ago, after his retirement from
RCA.
Earlier this year, I was able to borrow a copy from a local
university library. Some research in the Library of Congress
copyright database, and a letter to the original publisher, turned up
the happy news that the original copyright was never renewed and has
long since expired.
So, I spent several weekends running the book through a flatbed
scanner. After some weeks of fiddling around with
image-processing software, I was able to convert the scans into a very
usable PDF format, and create bookmarks for the table of contents.
The PDF is now available for free (as in "free beer") downloading,
and noncommercial use and distribution. You can find links to a
BitTorrent distribution, and an HTTP server distribution, at this
page on my home web site.
Radio Antenna Engineering is also available as a
"bookstore-quality" trade paperback edition, which can be purchased
from the LuLu.com "print on demand" service. The current price
($16.03 as of this writing) is set by LuLu, based on the number of
pages plus a flat fee for the binding (I have no financial stake in
this, as I chose LuLu's "no royalty, no commission" option). The
first person to order a copy has just written to say that the quality
appears to be high - all of the text and pictures came out well
(thanks, Ed!). So, if you're interested in having a hardcopy of
this excellent reference work, and don't wish to print one yourself
from the PDF, you can order a copy from this page on LuLu.com's site.
Happy reading!
This article has expired. No more comments may be added.
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Laport's 'Radio Antenna Engineering'
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by VK4JAM on October 4, 2005
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Hi David,
Thank you for taking the time and effort to do this. It's a great idea ... and there should me more of it.
73
Andrew
VK4JAM
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RE: Laport's 'Radio Antenna Engineering'
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by VE7ALQ on October 4, 2005
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I own the book, and it is excellently written.I heartily endorse it as reference book. The author goes into low frequency, medium frequency, and high frequency antennas.
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Laport's 'Radio Antenna Engineering'
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by W4CX on October 4, 2005
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WOW! Thank you Dave! What an excellent example of the ham-radio spirit, to unselfishly spend personal time (and expense, no doubt) and bring technology resources to our larger community, that ALL may learn and benefit. THANK YOU for making this fine pub known to us, and thank you more for exemplifying the true spirit of our community. 73, Darrell W4CX
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RE: Laport's 'Radio Antenna Engineering'
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by ARRLFAN on October 4, 2005
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AE6EO
Why are you stating that YOU did all of the work when in fact it has been avail for some time now in pdf format.
You state - "Earlier this year, I was able to borrow a copy from a local university library. Some research in the Library of Congress copyright database, and a letter to the original publisher, turned up the happy news that the original copyright was never renewed and has long since expired. So, I spent several weekends running the book through a flatbed scanner. After some weeks of fiddling around with image-processing software, I was able to convert the scans into a very usable PDF format, and create bookmarks for the table of contents."
---
This book has been available from LuLu at http://www.lulu.com/browse/book_view.php?fCID=159004 for some time now.
Sounds as if you want to get credit for something someone else has already done ---
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Subject: [TowerTalk] LaPort's "Radio Antenna Engineering"
From: Larry Phipps <larry@telepostinc.com>
Date: Wed, 28 Sep 2005 17:56:35 -0400
List-post: <mailto:towertalk@contesting.com>
I just recently added a new copy of LaPort's "Radio Antenna Engineering" to my reference library. I got it from LuLu.com. They have a free pdf of the book (also available elsewhere),
Here is the link for all who are interested...
http://www.lulu.com/browse/book_view.php?fCID=159004
73,
Larry N8LP
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RE: Laport's 'Radio Antenna Engineering'
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by K0BG on October 4, 2005
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It's very unfortunate that engineering books of this kind are so expensive that most interested parties forgo the purchase. Within this year, I have purchased two books on a similar subject. One cost me $175, the other nearly $200 (out pf print). I'm delighted to have this one in any form, as searches on rarebooks.org and bookfinder.com came up blank.
I did find that Linda Hall library in Kansas City, MO has two copies, but you have to be a registered scholar to borrow them. Thanks for your efforts.
Alan, KØBG
www.k0bg.com
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Laport's 'Radio Antenna Engineering'
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by WA2JJH on October 4, 2005
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I GOT TO HAVE ONE OF THOSE! The Book, not a UFO
Yes Alan, I was shocked to see the "New" prices on ANY engineering text book.
Seems like the minimum is $100! One Text book I had to buy cost $175.
Many students will either share or not buy the text
for many an engineering class.
73 de MIKE
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RE: Laport's 'Radio Antenna Engineering'
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by N9XY on October 4, 2005
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To ARRLFAN:
You missed the point: The file that David makes available on his website, and the file available from LuLu.com are identical, and are both the result of his scanning effort.
If you download both, and check DOCUMENT PROPERTIES you will see both are associated with David.
The advantage of getting the file from LuLu is that you can, for a very low price, order a printed, bound copy.
David, thanks again for making this fun, old and interesting book available to us.
73
Michael Roland
N9XY
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RE: Laport's 'Radio Antenna Engineering'
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by ARRLFAN on October 4, 2005
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My bad and I apologize then ...
I downloaded the book this morning and it is indeed something that will be handy ... I should not have jumped to such a sudden conclusion -- just lately it seems that we have so many hams out there taking credit for things they haven't really been part of ...
thx
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RE: Laport's 'Radio Antenna Engineering'
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by WF7A on October 4, 2005
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Sometimes, people take credit for something they created or obtained through their labors and may not be aware that the product, material or idea is already out there. (Just ask Al Gore about the Internet sometime. ;>)
I don't think Dave was trying to clap thunder and take credit for Lulu's work, but just tell us what has done; I didn't sense a "Look what I did before anybody else!" feeling at all.
Now, if you want to know who got Red Robin to serve extra fries with their hamburgers, that's me. :)
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RE: Laport's 'Radio Antenna Engineering'
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by KA0GKT on October 4, 2005
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Thank you. I have ben looking for a copy of Laport's for some time. It is much easier to bring up the PDF on the lap-top than to trek to the U of AZ Engineering Library (when I'm not on campus)
73 DE KAØGKT/7
--Steve
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copyright question
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by K7PEH on October 4, 2005
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I see that LuLu assigns the copyright to David and he also mentions in his post that the original copyright had expired.
So, does that mean that David now owns the copyright on the material that resides on Lulu?
How does this work legally? I mean, if there are any lawyers out there to explain. If David wanted to get some financial gain (if he wanted mind you) then could he do that now merely by having the copyright?
Questions, so many questions. Where is an attorney when you need one. Any copyright experts out there?
phil
K7PEH
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RE: copyright question
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by WA6BFH on October 4, 2005
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I was somewhat surprised to find that I did not know the name, or this mans work, since I had known of John Krause and G.H. Brown etc since I got my Novice license. I have read through a bit of the text, and will finish the rest over time.
Thank you for providing this, and bringing the work to light!
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RE: copyright question
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by WA6BFH on October 4, 2005
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I was somewhat surprised to find that I did not know the name, or this mans work, since I had known of John Krause and G.H. Brown etc since I got my Novice license. I have read through a bit of the text, and will finish the rest over time.
Thank you for providing this, and bringing the work to light!
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RE: copyright question
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by KG6WLS on October 4, 2005
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Thanks for going through the pain-staking trouble of resurrecting such a magnitude of timless information. I've had the ARRL Antenna book for awhile and I think that the "ebook" is a keeper as well.
It's nice to see some good come out of eHam once in awhile. Now, if anyone comes up with the repetitive "How do I's ?" on antennas in the elmers forum, they can simply be directed to this article or your site without all the silliness.
Great job!!
73
Mike
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Attaboy Dave!
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by N9CYS on October 4, 2005
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Thanks for the taking the time to check out the copyright, do the scans and then announcing it's availability.
I love tinkering with antennas (isn't that what ham radio is about?!).
I'll be checking it out before the cold winds damper the antenna building spirit in NINE land - usually January!!!
Thanks again and 73
Jim
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Great book, great job with the CC release
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by KB1KIX on October 5, 2005
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I was looking for this book for myself and another ham.
Great job on researching the copyright issues and then releasing it under the creative commons license.
For the naysayer above - the creative commons license alone is worth it, allowing me to give it away at club meetings and such.
Jonathan
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RE: Laport's 'Radio Antenna Engineering'
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by W6TH on October 5, 2005
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.
Strange how it is now gaining popularity which was something of great popularity before and during WW2.
In WW2 there was the single wire, two wire and the three wire Rhombic antennas designed by Laport.
Strange also that you mentioned published in 1952 when being in the U.S Army Signal Corps during WW2 we were already putting Laport antennas and theory to work (1941-1946), Rhombic antennas at ninty feet. My first experience was the two wire laport Rhombic from New Delhi, India beamed to Washington, DC.
I mention this as to possibly there may be a earlier edition that we may be missing on some more valuable information or does Washington have paper work that has never been let out to the public or allowed to be published?
.:
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Laport's 'Radio Antenna Engineering'
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by W6ABW on October 5, 2005
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Does anyone know of books by George H. Brown which are available in pdf?
Does anyone have a bibliography of technical articles
by George H. Brown?
Email me w6abw@earthlink.net
73, George, W6ABW
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RE: Laport's 'Radio Antenna Engineering'
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by WB6BYU on October 5, 2005
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La Porte was one of the chief antenna designers for RCA
in the glory days of Riverhead and Rocky Point. He published
a lot of papers over the years, and many of his ideas were
used by other organizations before he got around to writing
this particular book.
I've treasured a copy on my bookshelf for several years,
though I can't remember where I got it. One of my favorite
parts is the description of different types of feedlines:
4 wire balanced, 6 wire unbalanced, etc., as well as photos
of the supporting structures and insulators required in
practice to make use of such feedlines.
It does not include, however, the LaPorte dual-rhomboid
antenna, which was a later development.
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Laport's 'Radio Antenna Engineering'
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by W4VR on October 5, 2005
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Thanks for the tip...I ordered one. I had one of these when I did broadcast consulting work but lost the book. It was a good one, easier to understand than most antenna books.
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RE: Laport's 'Radio Antenna Engineering'
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by W6TH on October 5, 2005
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.
In that case I assume that many of Laports pages have been held back for publications as the information I studied from the Signal Corps was not too well known for the public. RCA was very shrewed in several cases such as this. Same RCA that gave Armstrong the business on his FM ideas.
.:
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RE: Laport's 'Radio Antenna Engineering'
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by KB9WQJ on October 5, 2005
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Tried to order from LuLu...created account, put book in cart, hit Checkout and was asked to log in again. Then was showed cart, clicked Checkout, then was asked to log in again, etc. etc. They say that this is a security setting...I lowered security as low as it would go (Medium) and cookies ARE enabled. It still kept looping on me. I don't need anything this bad. Fuggedaboudit.
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DOOOOOOOOOOOOOOODS
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by KA4KOE on October 5, 2005
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Dead Electrical Dudes is in the cue.
Number 19 to an eham page near you!
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RE: Laport's 'Radio Antenna Engineering'
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by KB9WQJ on October 6, 2005
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Update, I decided to give it one more chance. It worked. I can only speculate that there is a lag time between the creation of your account and when it will actually work. It WOULD be nice if there would be a message to the effect that "your login does not represent an account" so I could have figured it out sooner. Apparently if you enter something not recognized as an account (yet) it merely takes you back to the login page with no indication whatsoever of what went wrong. Give them a few hours to get your account going after you enter he info to get one.
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RE: Laport's 'Radio Antenna Engineering'
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by N4CQR on October 6, 2005
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I also appreciate your time on this effort.
Craig N4CQR
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Laport's 'Radio Antenna Engineering'
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by WA1RNE on October 6, 2005
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David;
Thanks for all your effort in making this book accessible to everyone.
These books are invaluable references - especially to the amateur community - as they are well written and compile a tremendous amount of useable information in one place.
As a suggestion, I've found the Navy's Navy Electricity and Electronics Training Series (NEETS) courses to be another excellent resource. They were last written in 1998 and have been released to the public for distribution. An ex-Navy friend has provided me with the entire series in PDF format, but of particular interest to hams will be Module 10 � Introduction to Wave Propagation, Transmission Lines, and Antennas.
It is written in layman's terms and is well worth checking out.
I don't have the web link available at the moment but I know the series is available for free on various web sites. A Google search should be all it takes....
73, Chris
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RE: Laport's 'Radio Antenna Engineering'
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by W6TH on October 6, 2005
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.
I don't believe that much more information can be had than from Laport, John Kraus and Terman. Brown has a few, but not known to many.
Most information is taken from these three. What information put into a computer and even the EZNEC are articles taken from these three gentlemen. Cebric uses the EZNEC and if you can see, all of his "novels" are from these three great men with his thoughts added.
Dr. John D. kraus my university teacher who ranks above an associate professor and Laport are my favorite.
73, W6TH
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RE: Laport's 'Radio Antenna Engineering'
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by K5UJ on October 6, 2005
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I also appreciate having access to this work. I spent some time today looking at the chapter on medium wave broadcast antennas and the chapter on feedlines. One thing I particularly appreciate is the plethora of photographs of tower construction and feedline support and routing. A very useful book. Thanks.
rob/k5uj
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Laport's 'Radio Antenna Engineering'
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by KE5AVC on October 7, 2005
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Thanks for the link to the PDF. This is great material, and although it dates back several decades, it bridges the gap between strict theory and practical application.
Growing up in Canada, my high school library had a couple of "Radio Fundamentals" volumes published around 1947 by the Royal Canadian Navy. I seem to recognize some of the pictures credited to that source.
Anyhow, I still enjoy reading over this type of book from a historical perspective. Keep up the good work.
Charles
KE5AVC
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RE: Laport's 'Radio Antenna Engineering'
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by WA1RNE on October 7, 2005
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I was able to find a link to Module 10 which deals with Wave Propogation, Antennas and Transmission Lines from the Navy's NEETS series. It's in PDF format and is in my opinion, written at a level that doesn't require the reader to have prerequisites in advanced math or engineering. Here is the link should anyone be interested:
https://www.cs.tcd.ie/Stephen.Farrell/ipn/background/US-Navy-NEETS/Module10-14182.pdf
Vito;
Agreed, except these references are not always easy to find. When available, I like to have several references to choose from as some can be better suited than others depending upon the audience they were intended for or just the style of the author.
Most of us didn't have opportunity nor pleasure to meet Dr. Kraus. Looking back, that experience must have been phenomenal.
73, Chris
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RE: Laport's 'Radio Antenna Engineering'
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by W6TH on October 7, 2005
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.
Chris, I see your point of view. With me I was brought up using math to satisfy my equations and just can't break the habit. With the present use of calculators, it does make it much quicker and easier on the brain; however I still use what I have learned in the past, so why waste my small amount of talent and become forgetful of what I did learn in the past.
My bosses wanted it down in writing so most could be used for patent rights along with what my bosses boss also were interested for a reason of their own.
With Dr. Kraus it was fun going along with analytical geometry ( Dividing into elemental parts or basic principles)mostly spheres where the "E" and "H" planes come into view.
I look at it as not giving up what I had always been enjoying for the past and guess am too old to make any changes. Can't teach an old dog new tricks.
73, W6TH
.:
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RE: Laport's 'Radio Antenna Engineering'
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by WA1RNE on October 7, 2005
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Vito;
In your line of work, the engineering certainly needs to be proven, otherwise the results can't be duplicated and the contracts won't be awarded.
For most hams, computers and programs like EZNEC have made antenna modeling much more straightforward. I haven't purchased the + version and thus am certainly nowhere near being a "master" of EZNEC.
Others obviously have, and from what I've seen from the ones who have, it is similar to what the first programable HP calculators did for me in the late 70's/early 80's while modeling audio amplifier power dissipation characteristics with resistive and reactive loads. It can be done on paper but it's a real grind when you're attempting to break new ground and you're under the gun.
As for changing the way you design or analyze antennas, keep going just the way you are, you payed your dues and shouldn't have to give up or change a thing.
73, Chris -... -.-
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RE: Laport's 'Radio Antenna Engineering'
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by W6TH on October 7, 2005
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.
Chris, well for one thing of interest, I will be able to carry on the process of teaching and showing for most part, to the younger generation, just how math does work. I find this of more interest than to be teaching the new young just how the EZNEC works.
The EZNEC does not indicate how math does work, just indicates the display. If it were not for math, the EZNEC could not exist as with all computer techniques.
In the case of capacitive and inductive reactance, ac and dc theory, only the engineers in design need to know math, the rest who do not know need not to be engineers of design work. Simple as that. If it were not for the mathematicians, there would be no EZNEC.
73, W6TH
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RE: Laport's 'Radio Antenna Engineering'
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by N2WEC on October 9, 2005
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All I can say is "thank you". Nice work both the author and yourself. Thanks for sharing with the rest of us.
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Laport's 'Radio Antenna Engineering'
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by W1RAN on October 13, 2005
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In May of 1954, I was waiting to see the head of the e.e. department at Worcester Polytech. Browsing the department library, I discovered Laport's Radio Antenna Engineering. I started at 9PM and didn't put it down until breakfast time, just amazed at his wealth of insights and common sense.
When I told my favorite professor, H.H. Newell
(who'd worked for EH Armstrong and had amazing contacts in the industry), he smiled and leaned back in his chair. "Ed Laport sat on my porch last summer, rueing his lack of mathematics in putting that book together."
At the IRE Show at the NYC Colisseum in '57, there was a model of Laport's two-wire rhombic, built on a sheet of plywood with doweling masts. It was the center of considerable interest. I photographed it.
In 1959, while working in a consulting group at the U.S. Army SigC Research Labs in NJ, I met a man ("Bud" ... have forgotten his last name) who was just back from KC4USA, head of army comms at the S Pole. When he saw himself in my photo, he said, "Don't you recognize whom I'm talking to? That's Ed Laport."
Last I heard of Laport was about 1991, when he was living near K2BK in Ringoes NJ. They visited ARRL HQ together that summer.
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Laport's 'Radio Antenna Engineering'
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by W4JLE on October 13, 2005
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Thanks David! I had previously downloaded the PDF, but us folks in the bi-focal crowd have a problem reading books on a computer. Not to mention it is inconvient to carry the laptop to the throne where I do most of my reading :>)
My copy arrived from LuLu, great job of printing and you sure can't beat the price.
73 and thanks again for your efforts.
Fred W4JLE
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Laport's 'Radio Antenna Engineering'
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by K8VF on October 16, 2005
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I got my copy Yesterday. Great copy and a great book of information.
Thanks for the work on this.
Mark
K8VF
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RE: copyright question
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by AE6EO on October 29, 2005
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With respect to the question that was asked about the copyright on this work: here's what I found out when I did the research on the issue. This is my layman's understanding of it - I'm not a lawyer.
Firstly: the original copyright has expired - it was never renewed at the end of its initial 28-year term. This means that Laport's work, in its original form (the printed edition) has reverted to the public domain. That form of the work can now be copied, independently, by anyone, and the copies can be sold commercially without violating the original author's legal rights. The same is true of many other older works - e.g. works of classic literature, the first few Oz novels by L. Frank Baum, and so forth. No one has exclusive rights to these books nowadays.
Now, a work which is in the public domain can be used as the basis of creating a new work - a "derivative" work in legal terminology. Doing so requires the investment of significant authorial or editorial effort of some sort - e.g. revising it, making corrections, or adding some additional new material. Once this is done, the derivative work is eligible for its own (new) copyright - it takes on an independent legal existence.
What I believe (as a layman) is that the effort I put into scanning the Laport book, cleaning up the scans, embedding the images, and adding the PDF bookmarks and index data, qualifies as "significant" editorial effort, and thus allows me to declare the PDF to be a derivative work rather than just as a copy of the original, and to assert my own copyright on the derivative.
So, yes, if I had wanted to make money from this, I could have done the conversion work and then sold the resulting file (or printed copies) commercially, and asserted my copyright on the result. I chose not to do so, but instead to publish under a license which would encourage widespread distribution. The Creative Commons license I selected seemed to be the best one around for this purpose.
The only reason I bothered with a copyright and license at all is that I didn't like the idea that somebody might take it and start selling commercial copies for profit without my approval.
The copyright on the derivative work (the PDF and the LuLu printed version of it) applies *only* to the derivatives. The original version (the McGraw-Hill printed edition) is still in the public domain - nothing I could or would do can change that. Anyone who wants to, can buy or borrow a copy of the original, scan it, and create their own PDF or printed edition for either commercial or noncommercial use - doing so would not put them into conflict with me in any way. I don't really expect that this will occur, given the length of time that this valuable work has languished, but I've been wrong plenty of times before!
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Laport's 'Radio Antenna Engineering'
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by W5CGH on May 2, 2006
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Mail this to a friend!
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Laport's book is a classic and belongs on the book shelf of every self professed antenna junkie.
I acquired my copy of Laport in a trade with a friend, and it has a somewhat interesting history. Tucked inside the book is an original letter from Laport to the purchaser of the book, detailing this particular edition. It seems that Laport was contacted by a Taiwanese publisher who wanted to work a deal to re-publish Laport's original edition. They worked out a deal, with Laport taking his royalty in "x" number of copies of the book, which he then sold for about $25 a piece through adds placed in various technical publications. Laport went on to say that there were also some number of bootlegged editions out there, including a version published in Chinese in mainland China that he had a copy of. He seemed somewhat stunned that his book still enjoyed such a following.
72 es 73,
Brad, W5CGH
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