The balun was made on T200-2 toroid ferrite core based on 1:1 VOLTAGE BALUN article by VK6YSF.
Core parameters: OD = 50.8mm, ID = 31.8mm, Ht = 14.0mm, AL = 12.0nH/N2.
Useful toroids information: http://toroids.info/T200-2.php.
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