At 09:21 AM 7/25/2006, Jerry Keller wrote:
>What beads exactly (source, item #, etc) would be good for this use on RG6 ?
Jerry,
I don't remember that he gives details, and don't have the book at
hand. One diagram does mention "Wireman" beads. At:
http://thewireman.com/index.shtml
I find his item 913, FB-43-2401 Ferrite Bead u = 850 at .25 each in 50
quantity.
http://thewireman.com/baluns.html#901
Also available in the type 73 material u - 2500.
I do remember that 50 beads are indicated in at least one place, maybe two
or more places. Also, he says some thing like: "Of course, use of ferrite
beads with lager coax such as RG-8 or RG-11 is not practical." I presume he
means it's not practical because of the cost of 50 or a hundred beads.
He does give the needed RF impedance of the de-coupling unit (on the order
of 1000 ohms or so) and the associated inductance needed for 160
meters. He also mentions the length of coax needed ( a lot ) to make such
a de-coupling inductance for 160M by winding the coax up into a coil.
Roy
- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
NEW: 13033 Downey Mill Road
Lovettsville, VA 20180
Phone 540-822-5911
Cell 301-928-7794
Work: Voice: 301-975-3254, Fax: 301-975-6097
roy.morgan@nist.gov --
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