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Author Topic: Transmission Line Transformers  (Read 671 times)

Offline Charlie_Dont_Surf

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Transmission Line Transformers
« on: January 16, 2023, 2007 UTC »
I mentioned over here that I was trying to find more information on designing transmission line transformers: https://www.hfunderground.com/board/index.php/topic,89881.msg335362.html#msg335362

I got what I was looking for and I figured that I would share:

The first reference is the second edition of a book that I own in print (first edition). Bowick, C., "RF Circuit Design". This section is basically untouched from the first edition: https://ia802603.us.archive.org/7/items/RFCircuitDesign2ndEdition/RF%20Circuit%20Design%20-%202nd%20Edition.pdf Starting on page 181 ("Broadband Transformers"), and especially pages 182-183, "Practical Winding Hints".

Also, Badger, G., A new class of coaxial line transformers, Ham Radio Mag azine, Part 1, 1218, Feb. 1980, and Part 2, 1829, Mar. 1980.
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Offline ~SIGINT~

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Re: Transmission Line Transformers
« Reply #1 on: January 17, 2023, 0032 UTC »
Thank you for sharing. This is a nice book.

I have a hard copy of the ARRL Transmission Line Transformers 2nd Ed by Jerry Sevick, W2FMI which I picked up at a surplus store and is also a good resource.

Offline Charlie_Dont_Surf

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Re: Transmission Line Transformers
« Reply #2 on: January 21, 2023, 2126 UTC »
Thank you for sharing. This is a nice book.

I have a hard copy of the ARRL Transmission Line Transformers 2nd Ed by Jerry Sevick, W2FMI which I picked up at a surplus store and is also a good resource.

I have not seen the ARRL book you mention.

Sevick died in 2009 and was a bright man but I'm not a huge fan of his cookbook style books like:

https://www.amidoncorp.com/understanding-building-and-using-baluns/
https://www.amidoncorp.com/transmission-line-transformer-handbook/

Without question there is a place for cookbooks but the organization of the text leaves me wanting and the photos of the finished products are 1970's style-low-contrast B&W gems that do nothing for me.

 The last of the big reference books that he made before he passed away was the 4th edition, which looks better:
https://www.okdxf.eu/files/Noble%20Publishing%20-%202001%20-%20Transmission%20Line%20Transformers,%204ed.pdf

After he passed away, Raymond Mack took up the task of reorganizing and refreshing the information into the 5th edition. I have not read it but on a quick scan the text looks a bit better to me and the photos are up to modern standards:
https://pdfroom.com/books/sevicks-transmission-line-transformers-theory-and-practice/qjb5q6EMdxQ
I don't STRETCH the truth.

"Every minute I spend in this room, my signal gets weaker.
Every minute Charlie squats in the bush, his signal gets stronger."

 


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