[RFI] small CMC

[Gary Johnson]

Use a 1.1-inch mix 31,  Fair-Rite 2631801202. Also great for USB cables and other small wires. However… Good luck finding any. Out of stock at Mouser and Arrow, but you can keep looking. A secondary choice is a 1.4-inch mix 41, Fair-Rite 2643802702. Those are in stock. Either type costs around $2 in small quantities. 

-Gary NA6O

> From: David Hale <astronomerdave at gmail.com <mailto:astronomerdave at gmail.com>>
> 
> I use K9YC-design CMCs (from the "Cookbook") all around the shack. I'd like
> to make a small one for a portable EFHW. So in other words I'd like a #31
> material core that is smaller than the Fair-Rite 2631803802 2.4 in core. Is
> there such a thing? I can't seem to find one, partially hindered by not
> having a part number but I wonder if this part is a victim to the
> ubiquitous supply shortages.
> 
> I've seen various commercial "line isolators" which from their descriptions
> are CMCs made with what looks like RG316 wound on what looks like about a ~
> 1 to 1 1/4 inch core. So presumably the part exists, though I suppose no
> guarantees on what material they are using.
> 
> Thoughts on a portable CMC?
> 
> 73, Dave N3WTK