Posted by
Jim Brown-10 on
Aug 31, 2010; 5:34am
URL: http://elecraft.85.s1.nabble.com/BL2-choking-Impedence-measurements-tp4686857p5481225.html
On Mon, 30 Aug 2010 20:02:09 -0700 (PDT), Chuck - AE4CW wrote:
>I've recently been using snap-on Fair-Rite part number 0431176451. It has
>impedance characteristics very similar to the largest snap-on (1" opening)
>but with a 0.7" opening and about 40% the cost. Arrow had them for less
>than $6 but is out of stock now. It plenty big enough for multiple turns of
>smaller cables including RG-8X. Have you tried this one?
I don't recall for sure if I measured that particular core, but I have
measured at least one core a bit smaller that the "biggest" and it performs
quite well, and is quite suitable for the uses you suggest. The important
things are the length (you want it long) and the diameter (you want to be
able to get enough turns through it). One of the cores I recommend for group
purchases is one that is about 0.5-in i.d., primarily because it's a good fit
for winding multiple turns of noisy computer and power supply cables through
it.
So yes, as long as you're sticking with #31 material for the low HF bands and
either #31 or #43 for the higher HF bands and VHF, you're in good shape.
73, Jim Brown K9YC
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html