Date: Tue, 23 Jul 2013 12:55:28 +0200
From: "Peter Voelpel" <dj7ww@t-online.de>
To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] Which Balun with the TH7DXX
I used their table with the snap-its cores.
The 2.4 inch 61 core is part number 5961003821.
I use them for stack match transformers from time time or for small baluns
wound with RG142.
13 turns of RG142 on a single core give me 30uH, same as my solenoid chokes.
73
Peter
## I measure 128 uh with 4 turns of RG-393 teflon coax wound
through 4 x stacked 2.4 inch OD torroids. ( type 31).
## That 128 uh reading was taken on my B+K model 875B
digital LCR meter..as are the following bead baluns below.
## Just for comparison, 17 inches of the type 43 , 1.025 inch OD beads slid
over 393 coax is = 38 uh. 24 inchs of the same type 43 beads
slid over 393 coax = 54 uh. 50 % more beads = 50% more uh.
## 17 inches of type 77 1.025 inch OD beads slid over 393 coax = 68 uh.
## I have no type 31 beads to experiment with... but slid over 213 u or 393
coax,
the uh will be a little higher than the type 43 beads.
Jim VE7RF
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