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[TowerTalk] Binocular Core Winding - A Summary

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Subject: [TowerTalk] Binocular Core Winding - A Summary
From: "D. Scott MacKenzie" <>
Date: Sat, 30 Dec 2006 13:51:44 -0500
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First off I want to thank everyone that responded.

>From using a Amidon BN73-202 binocular core - 3
turns primary, 12 turns secondary.

>From using a Fair Products
2873000202 binocular core - 2 passes primary, and 4 passes secondary...this
looks like a single turn primary, and a 4 turn secondary.  He uses a
balancing pass to reduce stray capacitance.

>From RA6LBS [] he recommends 2 turns primary and 8 turns

The common thread in each of these recommendations, is 4:1 Secondary to
Primary passes

>From Mike [] he indicates that: "each time you poke a wire
through one of the holes in the binocular core that counts as a turn.  So,
for the two turn primary, make a hair pin out of the wire and stick one side
of the hair pin into one of the holes in the core and the other wire side
into the other hole in the core - 2 turn primary."

Have I missed anything?

I have a bunch of the binocular cores, and will build a couple, with a
resistor across the secondary, to see how they work, and to see if I can
build the proper transformer.  Should I use a potentiometer (0-1000 ohms) to
enable me to measure it properly ?


Scott, aka KBØFHP


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