On 11/30/15 9:17 AM, Jamie Tolbert wrote:
What tpe beads do I need, 43 or 73? length? 4 ft, 100 beads seems awfully
long.....
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I use 31 mix for this kind of choke application.
what is your operating frequency?
http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf
see pages 22-25
73 is better in general, 43 is ok for low frequencies
31 isn't great for bead baluns..
Have you considered using a 2.4" toroid core(s) and running multiple
turns of the coax through it. I can get about 10-12 turns of 1/4"
diameter coax (RG58 type) through those cores. I think you can get 3-5
turns of 0.405" coax (RG213 type) through it.
There's a fairly decent cookbook for this kind of thing, with all the
measurements on actual chokes, etc. in Chapter 7 of
http://www.audiosystemsgroup.com/RFI-Ham.pdf
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