From: John Woodgate
Subject: Re: low loss transformer availability?
Date: Mon, 6 Jan 2003 08:35:51 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 6 Jan 2003 10:09:37 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Winfield Hill
wrote (in ) about 'low loss transformer
availability?', on Sun, 5 Jan 2003:
>Transmission line transformers are the technology of choice
> if wide-band fixed-impedance transformers are needed. They
> are easy to make in various ratios of two, like 2, 4 and 16.
> For example, learning from Jerry Sevick, I designed a wideband
> 16x transformer (RIS-294) that worked in two stages. First 50
> to 12.5 ohms with 25-ohm coax, finishing with 12.5 ohms to 3.2
> ohms using 6-ohm transmission line, made from two wide copper
> strips insulated with a thin layer of Kapton tape. It handled
> over 100W, was flat from 500kHz to well over 50MHz, and could
> deliver over 10A peak into a 3 load.
> Well, I was impressed at the time, even if others weren't.
> Plus that's not what our O.P. needs anyway. :>)
What I had in mind was how long the cables would have to be to work at 3
MHz. '500 kHz' makes the answer even more interesting.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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