Dear Ralph: Thanks! The Wireman certainly looks like a source for
relatively short pieces of specialized coax. I have quite a bit of Type 31
on hand that I expect to use. Type 31 seems to be very useful for choking
in the lower HF region.

The Wireman must be on my list of suppliers, but too many entries is the
bane of the advent of the Internet grin.

Thanks again. 73, Mac N8TT

"Ralph Mowery" wrote in message
...


"J. C. Mc Laughlin" wrote in message
.. .
Dear Group: I expect to craft a common-mode choke for 50 ohm coax that
works from 1.8 to at least 7 MHz using Type 31 (Fair-Rite) core material.
Use of any Fe material in coax at the lower HF frequencies is undesired -
no center conductors containing steel. Such coax should be able to
tolerate being bent with a small radius to facilitate multiple turns
through the core - no foam dielectric.

One such coax appears to be the expensive RG-400. Only need a few feet.

Question: What might be a source for short lengths of RG-400? I have
tried Newark, Mouser, and the like. . . .

Question: What other small diameter coax uses no steel and has a solid
dielectric?

Thanks. 73, Mac N8TT


Look he
http://www.thewireman.com/coaxp.html

They list rg400 at about $ 2 per foot.

They may also have something you need for the choke.





J. C. Mc Laughlin
Michigan U.S.A.
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