Tom,
I believe the BN-73-202 from Amidon is identical with the
core you mentioned. It is listed at 0,80, somewhat more
than your 0.60 but another source for those interested.
73 Don K5AQ
-----Original Message-----
From: w8ji.tom <w8ji.tom@MCIONE.com>
To: Earl W Cunningham <k6se@juno.com>; topband@contesting.com
<topband@contesting.com>
To: <topband@contesting.com>
Date: Saturday, September 12, 1998 12:21 PM
Subject: Re: TopBand: 1:16 Balun Xfmrs
>
>Hi Earl,
>
>> Tom's (W8JI) design uses a 73 material "binocular" core, with a 2-turn
>> primary (#29 AWG) and an 8-turn secondary (#26 AWG) wound on top of the
>> primary. Tom said, "The core is about 1" long and 1/2" thick, and is
>> commonly stocked". (By whom?)
>
>Ameritron uses them, PN 412-5250.
>Fair-Rite corp makes them, P/N 2873000202.
>
>I had the dimensions wrong. I eyeballed it. They are just over 1/2 inch
>long. That gives over 1" of ferrite around the winding in a single turn.
>The winding was #26 both primary and secondary, size isn't important as
>long as it fits and the wire doesn't break easily.
>
>Additionally, you could use these cores with a bifilar winding as a common
>mode choke. Five passes through the holes would be a few thousand ohms
>series common mode Z. I use them on loops.
>
>FB-73-801 or 2673801 beads work also, if you stack them. A one or two inch
>stack is fine.
>
>73 Tom
>
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