Best way to learn about effective RFI supression is to ready K9YC's tutorial.
Just
google feedline current choke and you should find it easily. More turns is NOT
always better as it can change the frequency of max impedance.
http://www.audiosystemsgroup.com/RFI-Ham.pdf
-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065
On Tue Oct 26 11:06 , "Bill, W6WRT" sent:
>ORIGINAL MESSAGE:
>
>On Tue, 26 Oct 2010 11:44:03 -0400, "Carl" km1h@jeremy.mv.com> wrote:
>
>>
>>Powdered iron is fine for tuned circuits and high power HF baluns where low
>>loss is needed. Even Sevik woke up to that fact.
>
>REPLY:
>
>I know every situation is different, but over the years I have used
>literally dozens of those "snap-on" ferrites with almost no success at
>all. I have tried both the two-piece rectangular and the clamshell type
>but I don't know what mix they are. Perhaps a different mix would be
>better.
>
>On the other hand a single moderately large powdered iron toroid has
>always worked without fail. I use Palomar's mix #6 (yellow) in about a
>two inch diameter and wind as many turns through it as will fit,
>typically about 10-12 turns for smaller wires. Excellent results.
>
>Please note thatI am talking about RFI problems in the shack, not high
>power baluns for the transmit coax.
>
>73, Bill W6WRT
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