[Elecraft] RFIth

[Jim Brown]

Dave,

Yes. In other words, just as we would wind in sequence around a toroid. 
It limits the number of useful turns that can be wound to one side of 
the clamp. Once I realized that, I no longer recommend the clamp-on for 
TX chokes, only for RFI suppression.

73, Jim K9YC

On 12/21/2021 6:47 AM, Dave Fugleberg wrote:
> Jim,
> When you said “turns must go through the core in sequence”, does that 
> mean that each turn must rest next to the last one, rather than 
> overlapping one or more previous turns? I suspect that’s what “in 
> sequence “ means- just want to make sure.
> 
> 
> On Mon, Dec 20, 2021 at 10:40 PM Jim Brown <jim at audiosystemsgroup.com 
> <mailto:jim at audiosystemsgroup.com>> wrote:
> 
>     On 12/20/2021 7:50 PM, Buck K4IA wrote:
>      > More turns is better until we get to very large chokes where the
>      > inter-coil capacitance lowers the impedance.
> 
>     No. See my post in this thread about resonance.
> 
>     BTW -- I strongly agree that clamp-ons should be secured with a
>     ty-wrap.
>     And something I missed the first time around, but corrected in the
>     latest version of RFI-Ham is that turns must go though the core in
>     sequence. Out of sequence turns cancel in-sequence turns. Learned this
>     from some measurements.
> 
>     73, Jim K9YC
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