Topband: center-tapped common mode choke

[Pete Smith]

In response to all the curiosity and commentary about the ON4UN choke 
arrangement, I have added some material quoted from his Low-Band 
Dxing, 4th edition, at the end of the writeup 
<http://wiki.contesting.com/index.php/Common_mode_chokes#Center-tapped_bead_choke_details> 
.  It explains it far better than I could.

73, Pete N4ZR
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