Date sent: Wed, 24 Feb 1999 09:34:32 -0700
From: "Fatchett, Mike" <Fatchett.Mike@tci.com>
Subject: TopBand: Beverage matching
To: "'topband@contesting.com'" <topband@contesting.com>
>
> What is the best material to make the 9:1 matching tranformers out of and
> where can I get some. I am going to build some of the famous slinky
> beverages. Our local Target stores have been carrying them.
For a fairly tight coupled transformer in a non-resonant circuit
(which is what you have) 73 material would be about optimum. If
you only want to cover 160, you could move up to 75 material.
Other materials will work, but generally require more turns for a
given impedance and core stack thickness.
I use Fair-rite Products 2873000202 cores in my transformers, that
core would require a three turn primary and 10 turn secondary for
your application for 75 ohms, and 2 turn primary and 8 or 9 turn
secondary for 50 ohm feedlines.
These things aren't that critical.
73, Tom W8JI
w8ji@contesting.com
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